mirror of git://git.gnupg.org/gnupg.git
4122 lines
103 KiB
C
4122 lines
103 KiB
C
/* command-ssh.c - gpg-agent's implementation of the ssh-agent protocol.
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* Copyright (C) 2004-2006, 2009, 2012 Free Software Foundation, Inc.
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* Copyright (C) 2004-2006, 2009, 2012-2014 Werner Koch
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*
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* This file is part of GnuPG.
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*
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||
* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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||
*
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||
* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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/* Only v2 of the ssh-agent protocol is implemented. Relevant RFCs
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are:
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RFC-4250 - Protocol Assigned Numbers
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RFC-4251 - Protocol Architecture
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RFC-4252 - Authentication Protocol
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RFC-4253 - Transport Layer Protocol
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RFC-5656 - ECC support
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The protocol for the agent is defined in:
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https://tools.ietf.org/html/draft-miller-ssh-agent
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifndef HAVE_W32_SYSTEM
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#include <sys/socket.h>
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#include <sys/un.h>
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#endif /*!HAVE_W32_SYSTEM*/
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#ifdef HAVE_SYS_UCRED_H
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#include <sys/ucred.h>
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#endif
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#ifdef HAVE_UCRED_H
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#include <ucred.h>
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#endif
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#include "agent.h"
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#include "../common/i18n.h"
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#include "../common/util.h"
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#include "../common/ssh-utils.h"
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/* Request types. */
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#define SSH_REQUEST_REQUEST_IDENTITIES 11
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#define SSH_REQUEST_SIGN_REQUEST 13
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#define SSH_REQUEST_ADD_IDENTITY 17
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#define SSH_REQUEST_REMOVE_IDENTITY 18
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#define SSH_REQUEST_REMOVE_ALL_IDENTITIES 19
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#define SSH_REQUEST_LOCK 22
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#define SSH_REQUEST_UNLOCK 23
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#define SSH_REQUEST_ADD_ID_CONSTRAINED 25
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#define SSH_REQUEST_EXTENSION 27
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/* Options. */
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#define SSH_OPT_CONSTRAIN_LIFETIME 1
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#define SSH_OPT_CONSTRAIN_CONFIRM 2
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#define SSH_OPT_CONSTRAIN_MAXSIGN 3
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#define SSH_OPT_CONSTRAIN_EXTENSION 255
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/* Response types. */
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#define SSH_RESPONSE_SUCCESS 6
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#define SSH_RESPONSE_FAILURE 5
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#define SSH_RESPONSE_IDENTITIES_ANSWER 12
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#define SSH_RESPONSE_SIGN_RESPONSE 14
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#define SSH_RESPONSE_EXTENSION_FAILURE 28
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/* Other constants. */
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#define SSH_DSA_SIGNATURE_PADDING 20
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#define SSH_DSA_SIGNATURE_ELEMS 2
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#define SSH_AGENT_RSA_SHA2_256 0x02
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#define SSH_AGENT_RSA_SHA2_512 0x04
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#define SPEC_FLAG_USE_PKCS1V2 (1 << 0)
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#define SPEC_FLAG_IS_ECDSA (1 << 1)
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#define SPEC_FLAG_IS_EdDSA (1 << 2) /*(lowercase 'd' on purpose.)*/
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#define SPEC_FLAG_WITH_CERT (1 << 7)
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/* The name of the control file. */
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#define SSH_CONTROL_FILE_NAME "sshcontrol"
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/* The blurb we put into the header of a newly created control file. */
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static const char sshcontrolblurb[] =
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"# List of allowed ssh keys. Only keys present in this file are used\n"
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"# in the SSH protocol. The ssh-add tool may add new entries to this\n"
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"# file to enable them; you may also add them manually. Comment\n"
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"# lines, like this one, as well as empty lines are ignored. Lines do\n"
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"# have a certain length limit but this is not serious limitation as\n"
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"# the format of the entries is fixed and checked by gpg-agent. A\n"
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"# non-comment line starts with optional white spaces, followed by the\n"
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"# keygrip of the key given as 40 hex digits, optionally followed by a\n"
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"# caching TTL in seconds, and another optional field for arbitrary\n"
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"# flags. Prepend the keygrip with an '!' mark to disable it.\n"
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"\n";
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/* Macros. */
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/* Return a new uint32 with b0 being the most significant byte and b3
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being the least significant byte. */
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#define uint32_construct(b0, b1, b2, b3) \
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((b0 << 24) | (b1 << 16) | (b2 << 8) | b3)
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/*
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* Basic types.
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*/
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/* Type for a request handler. */
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typedef gpg_error_t (*ssh_request_handler_t) (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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struct ssh_key_type_spec;
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typedef struct ssh_key_type_spec ssh_key_type_spec_t;
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/* Type, which is used for associating request handlers with the
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appropriate request IDs. */
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typedef struct ssh_request_spec
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{
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unsigned char type;
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ssh_request_handler_t handler;
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const char *identifier;
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unsigned int secret_input;
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} ssh_request_spec_t;
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/* Type for "key modifier functions", which are necessary since
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OpenSSH and GnuPG treat key material slightly different. A key
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modifier is called right after a new key identity has been received
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in order to "sanitize" the material. */
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typedef gpg_error_t (*ssh_key_modifier_t) (const char *elems,
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gcry_mpi_t *mpis);
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/* The encoding of a generated signature is dependent on the
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algorithm; therefore algorithm specific signature encoding
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functions are necessary. */
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typedef gpg_error_t (*ssh_signature_encoder_t) (ssh_key_type_spec_t *spec,
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estream_t signature_blob,
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gcry_sexp_t sig);
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/* Type, which is used for bundling all the algorithm specific
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information together in a single object. */
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struct ssh_key_type_spec
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{
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/* Algorithm identifier as used by OpenSSH. */
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const char *ssh_identifier;
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/* Human readable name of the algorithm. */
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const char *name;
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/* Algorithm identifier as used by GnuPG. */
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int algo;
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/* List of MPI names for secret keys; order matches the one of the
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agent protocol. */
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const char *elems_key_secret;
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/* List of MPI names for public keys; order matches the one of the
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agent protocol. */
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const char *elems_key_public;
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/* List of MPI names for signature data. */
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const char *elems_signature;
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/* List of MPI names for secret keys; order matches the one, which
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is required by gpg-agent's key access layer. */
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const char *elems_sexp_order;
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/* Key modifier function. Key modifier functions are necessary in
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order to fix any inconsistencies between the representation of
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keys on the SSH and on the GnuPG side. */
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ssh_key_modifier_t key_modifier;
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/* Signature encoder function. Signature encoder functions are
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necessary since the encoding of signatures depends on the used
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algorithm. */
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ssh_signature_encoder_t signature_encoder;
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/* The name of the ECC curve or NULL for non-ECC algos. This is the
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* canonical name for the curve as specified by RFC-5656. */
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const char *curve_name;
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/* An alias for curve_name or NULL. Actually this is Libcgrypt's
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* primary name of the curve. */
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const char *alt_curve_name;
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/* The hash algorithm to be used with this key. 0 for using the
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default. */
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int hash_algo;
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/* Misc flags. */
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unsigned int flags;
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};
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/* Definition of an object to access the sshcontrol file. */
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struct ssh_control_file_s
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{
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char *fname; /* Name of the file. */
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estream_t fp; /* This is never NULL. */
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int lnr; /* The current line number. */
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struct {
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int valid; /* True if the data of this structure is valid. */
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int disabled; /* The item is disabled. */
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int ttl; /* The TTL of the item. */
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int confirm; /* The confirm flag is set. */
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char hexgrip[40+1]; /* The hexgrip of the item (uppercase). */
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} item;
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};
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/* Two objects definition to hold keys for later sorting. */
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struct key_collection_item_s
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{
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gcry_sexp_t key; /* Public key. (owned by us) */
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char *cardsn; /* Serial number of a card or NULL. (owned by us) */
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int order; /* Computed ordinal */
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};
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struct key_collection_s
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{
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struct key_collection_item_s *items;
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size_t allocated;
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size_t nitems;
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};
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/* Prototypes. */
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static gpg_error_t ssh_handler_request_identities (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_sign_request (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_add_identity (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_remove_identity (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_remove_all_identities (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_lock (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_unlock (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_handler_extension (ctrl_t ctrl,
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estream_t request,
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estream_t response);
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static gpg_error_t ssh_key_modifier_rsa (const char *elems, gcry_mpi_t *mpis);
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static gpg_error_t ssh_signature_encoder_rsa (ssh_key_type_spec_t *spec,
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estream_t signature_blob,
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gcry_sexp_t signature);
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static gpg_error_t ssh_signature_encoder_dsa (ssh_key_type_spec_t *spec,
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estream_t signature_blob,
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gcry_sexp_t signature);
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static gpg_error_t ssh_signature_encoder_ecdsa (ssh_key_type_spec_t *spec,
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estream_t signature_blob,
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gcry_sexp_t signature);
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static gpg_error_t ssh_signature_encoder_eddsa (ssh_key_type_spec_t *spec,
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estream_t signature_blob,
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gcry_sexp_t signature);
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static gpg_error_t ssh_key_extract_comment (gcry_sexp_t key, char **comment);
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struct peer_info_s
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{
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unsigned long pid;
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int uid;
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};
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/* Global variables. */
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/* Associating request types with the corresponding request
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handlers. */
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static const ssh_request_spec_t request_specs[] =
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{
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#define REQUEST_SPEC_DEFINE(id, name, secret_input) \
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{ SSH_REQUEST_##id, ssh_handler_##name, #name, secret_input }
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REQUEST_SPEC_DEFINE (REQUEST_IDENTITIES, request_identities, 1),
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REQUEST_SPEC_DEFINE (SIGN_REQUEST, sign_request, 0),
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REQUEST_SPEC_DEFINE (ADD_IDENTITY, add_identity, 1),
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REQUEST_SPEC_DEFINE (ADD_ID_CONSTRAINED, add_identity, 1),
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REQUEST_SPEC_DEFINE (REMOVE_IDENTITY, remove_identity, 0),
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REQUEST_SPEC_DEFINE (REMOVE_ALL_IDENTITIES, remove_all_identities, 0),
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REQUEST_SPEC_DEFINE (LOCK, lock, 0),
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REQUEST_SPEC_DEFINE (UNLOCK, unlock, 0),
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REQUEST_SPEC_DEFINE (EXTENSION, extension, 0)
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#undef REQUEST_SPEC_DEFINE
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};
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/* Table holding key type specifications. */
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static const ssh_key_type_spec_t ssh_key_types[] =
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{
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{
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"ssh-ed25519", "Ed25519", GCRY_PK_EDDSA, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_eddsa,
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"Ed25519", NULL, 0, SPEC_FLAG_IS_EdDSA
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},
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{
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"ssh-rsa", "RSA", GCRY_PK_RSA, "nedupq", "en", "s", "nedpqu",
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ssh_key_modifier_rsa, ssh_signature_encoder_rsa,
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NULL, NULL, 0, SPEC_FLAG_USE_PKCS1V2
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},
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{
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"ssh-dss", "DSA", GCRY_PK_DSA, "pqgyx", "pqgy", "rs", "pqgyx",
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NULL, ssh_signature_encoder_dsa,
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NULL, NULL, 0, 0
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},
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{
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"ecdsa-sha2-nistp256", "ECDSA", GCRY_PK_ECC, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_ecdsa,
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"nistp256", "NIST P-256", GCRY_MD_SHA256, SPEC_FLAG_IS_ECDSA
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},
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{
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"ecdsa-sha2-nistp384", "ECDSA", GCRY_PK_ECC, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_ecdsa,
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"nistp384", "NIST P-384", GCRY_MD_SHA384, SPEC_FLAG_IS_ECDSA
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},
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{
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"ecdsa-sha2-nistp521", "ECDSA", GCRY_PK_ECC, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_ecdsa,
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"nistp521", "NIST P-521", GCRY_MD_SHA512, SPEC_FLAG_IS_ECDSA
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},
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{
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"ssh-ed25519-cert-v01@openssh.com", "Ed25519",
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GCRY_PK_EDDSA, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_eddsa,
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"Ed25519", NULL, 0, SPEC_FLAG_IS_EdDSA | SPEC_FLAG_WITH_CERT
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},
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{
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"ssh-rsa-cert-v01@openssh.com", "RSA",
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GCRY_PK_RSA, "nedupq", "en", "s", "nedpqu",
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ssh_key_modifier_rsa, ssh_signature_encoder_rsa,
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NULL, NULL, 0, SPEC_FLAG_USE_PKCS1V2 | SPEC_FLAG_WITH_CERT
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},
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{
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"ssh-dss-cert-v01@openssh.com", "DSA",
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GCRY_PK_DSA, "pqgyx", "pqgy", "rs", "pqgyx",
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NULL, ssh_signature_encoder_dsa,
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NULL, NULL, 0, SPEC_FLAG_WITH_CERT | SPEC_FLAG_WITH_CERT
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},
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{
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"ecdsa-sha2-nistp256-cert-v01@openssh.com", "ECDSA",
|
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GCRY_PK_ECC, "qd", "q", "rs", "qd",
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NULL, ssh_signature_encoder_ecdsa,
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"nistp256", "NIST P-256", GCRY_MD_SHA256,
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SPEC_FLAG_IS_ECDSA | SPEC_FLAG_WITH_CERT
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},
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||
{
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||
"ecdsa-sha2-nistp384-cert-v01@openssh.com", "ECDSA",
|
||
GCRY_PK_ECC, "qd", "q", "rs", "qd",
|
||
NULL, ssh_signature_encoder_ecdsa,
|
||
"nistp384", "NIST P-384", GCRY_MD_SHA384,
|
||
SPEC_FLAG_IS_ECDSA | SPEC_FLAG_WITH_CERT
|
||
},
|
||
{
|
||
"ecdsa-sha2-nistp521-cert-v01@openssh.com", "ECDSA",
|
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GCRY_PK_ECC, "qd", "q", "rs", "qd",
|
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NULL, ssh_signature_encoder_ecdsa,
|
||
"nistp521", "NIST P-521", GCRY_MD_SHA512,
|
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SPEC_FLAG_IS_ECDSA | SPEC_FLAG_WITH_CERT
|
||
}
|
||
};
|
||
|
||
|
||
|
||
|
||
|
||
/*
|
||
General utility functions.
|
||
*/
|
||
|
||
/* A secure realloc, i.e. it makes sure to allocate secure memory if A
|
||
is NULL. This is required because the standard gcry_realloc does
|
||
not know whether to allocate secure or normal if NULL is passed as
|
||
existing buffer. */
|
||
static void *
|
||
realloc_secure (void *a, size_t n)
|
||
{
|
||
void *p;
|
||
|
||
if (a)
|
||
p = gcry_realloc (a, n);
|
||
else
|
||
p = gcry_malloc_secure (n);
|
||
|
||
return p;
|
||
}
|
||
|
||
|
||
/* Lookup the ssh-identifier for the ECC curve CURVE_NAME. Returns
|
||
* NULL if not found. If found the ssh indetifier is returned and a
|
||
* pointer to the canonical curve name as specified for ssh is stored
|
||
* at R_CANON_NAME. */
|
||
static const char *
|
||
ssh_identifier_from_curve_name (const char *curve_name,
|
||
const char **r_canon_name)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < DIM (ssh_key_types); i++)
|
||
if (ssh_key_types[i].curve_name
|
||
&& (!strcmp (ssh_key_types[i].curve_name, curve_name)
|
||
|| (ssh_key_types[i].alt_curve_name
|
||
&& !strcmp (ssh_key_types[i].alt_curve_name, curve_name))))
|
||
{
|
||
*r_canon_name = ssh_key_types[i].curve_name;
|
||
return ssh_key_types[i].ssh_identifier;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/*
|
||
Primitive I/O functions.
|
||
*/
|
||
|
||
|
||
/* Read a byte from STREAM, store it in B. */
|
||
static gpg_error_t
|
||
stream_read_byte (estream_t stream, unsigned char *b)
|
||
{
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
ret = es_fgetc (stream);
|
||
if (ret == EOF)
|
||
{
|
||
if (es_ferror (stream))
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
err = gpg_error (GPG_ERR_EOF);
|
||
*b = 0;
|
||
}
|
||
else
|
||
{
|
||
*b = ret & 0xFF;
|
||
err = 0;
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Write the byte contained in B to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_byte (estream_t stream, unsigned char b)
|
||
{
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
ret = es_fputc (b, stream);
|
||
if (ret == EOF)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
err = 0;
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a uint32 from STREAM, store it in UINT32. */
|
||
static gpg_error_t
|
||
stream_read_uint32 (estream_t stream, u32 *uint32)
|
||
{
|
||
unsigned char buffer[4];
|
||
size_t bytes_read;
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
ret = es_read (stream, buffer, sizeof (buffer), &bytes_read);
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
{
|
||
if (bytes_read != sizeof (buffer))
|
||
err = gpg_error (GPG_ERR_EOF);
|
||
else
|
||
{
|
||
u32 n;
|
||
|
||
n = uint32_construct (buffer[0], buffer[1], buffer[2], buffer[3]);
|
||
*uint32 = n;
|
||
err = 0;
|
||
}
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Write the uint32 contained in UINT32 to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_uint32 (estream_t stream, u32 uint32)
|
||
{
|
||
unsigned char buffer[4];
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
buffer[0] = uint32 >> 24;
|
||
buffer[1] = uint32 >> 16;
|
||
buffer[2] = uint32 >> 8;
|
||
buffer[3] = uint32 >> 0;
|
||
|
||
ret = es_write (stream, buffer, sizeof (buffer), NULL);
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
err = 0;
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Read SIZE bytes from STREAM into BUFFER. */
|
||
static gpg_error_t
|
||
stream_read_data (estream_t stream, unsigned char *buffer, size_t size)
|
||
{
|
||
gpg_error_t err;
|
||
size_t bytes_read;
|
||
int ret;
|
||
|
||
ret = es_read (stream, buffer, size, &bytes_read);
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
{
|
||
if (bytes_read != size)
|
||
err = gpg_error (GPG_ERR_EOF);
|
||
else
|
||
err = 0;
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Skip over SIZE bytes from STREAM. */
|
||
static gpg_error_t
|
||
stream_read_skip (estream_t stream, size_t size)
|
||
{
|
||
char buffer[128];
|
||
size_t bytes_to_read, bytes_read;
|
||
int ret;
|
||
|
||
do
|
||
{
|
||
bytes_to_read = size;
|
||
if (bytes_to_read > sizeof buffer)
|
||
bytes_to_read = sizeof buffer;
|
||
|
||
ret = es_read (stream, buffer, bytes_to_read, &bytes_read);
|
||
if (ret)
|
||
return gpg_error_from_syserror ();
|
||
else if (bytes_read != bytes_to_read)
|
||
return gpg_error (GPG_ERR_EOF);
|
||
else
|
||
size -= bytes_to_read;
|
||
}
|
||
while (size);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Write SIZE bytes from BUFFER to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_data (estream_t stream, const unsigned char *buffer, size_t size)
|
||
{
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
ret = es_write (stream, buffer, size, NULL);
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
else
|
||
err = 0;
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Read a binary string from STREAM into STRING, store size of string
|
||
in STRING_SIZE. Append a hidden nul so that the result may
|
||
directly be used as a C string. Depending on SECURE use secure
|
||
memory for STRING. If STRING is NULL do only a dummy read. */
|
||
static gpg_error_t
|
||
stream_read_string (estream_t stream, unsigned int secure,
|
||
unsigned char **string, u32 *string_size)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned char *buffer = NULL;
|
||
u32 length = 0;
|
||
|
||
if (string_size)
|
||
*string_size = 0;
|
||
|
||
/* Read string length. */
|
||
err = stream_read_uint32 (stream, &length);
|
||
if (err)
|
||
goto out;
|
||
|
||
if (string)
|
||
{
|
||
/* Allocate space. */
|
||
if (secure)
|
||
buffer = xtrymalloc_secure (length + 1);
|
||
else
|
||
buffer = xtrymalloc (length + 1);
|
||
if (! buffer)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
/* Read data. */
|
||
err = length? stream_read_data (stream, buffer, length) : 0;
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Finalize string object. */
|
||
buffer[length] = 0;
|
||
*string = buffer;
|
||
}
|
||
else /* Dummy read requested. */
|
||
{
|
||
err = length? stream_read_skip (stream, length) : 0;
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
if (string_size)
|
||
*string_size = length;
|
||
|
||
out:
|
||
|
||
if (err)
|
||
xfree (buffer);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a binary string from STREAM and store it as an opaque MPI at
|
||
R_MPI, adding 0x40 (this is the prefix for EdDSA key in OpenPGP).
|
||
Depending on SECURE use secure memory. If the string is too large
|
||
for key material return an error. */
|
||
static gpg_error_t
|
||
stream_read_blob (estream_t stream, unsigned int secure, gcry_mpi_t *r_mpi)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned char *buffer = NULL;
|
||
u32 length = 0;
|
||
|
||
*r_mpi = NULL;
|
||
|
||
/* Read string length. */
|
||
err = stream_read_uint32 (stream, &length);
|
||
if (err)
|
||
goto leave;
|
||
|
||
/* To avoid excessive use of secure memory we check that an MPI is
|
||
not too large. */
|
||
if (length > (4096/8) + 8)
|
||
{
|
||
log_error (_("ssh keys greater than %d bits are not supported\n"), 4096);
|
||
err = GPG_ERR_TOO_LARGE;
|
||
goto leave;
|
||
}
|
||
|
||
/* Allocate space. */
|
||
if (secure)
|
||
buffer = xtrymalloc_secure (length+1);
|
||
else
|
||
buffer = xtrymalloc (length+1);
|
||
if (!buffer)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
/* Read data. */
|
||
err = stream_read_data (stream, buffer + 1, length);
|
||
if (err)
|
||
goto leave;
|
||
|
||
buffer[0] = 0x40;
|
||
*r_mpi = gcry_mpi_set_opaque (NULL, buffer, 8*(length+1));
|
||
buffer = NULL;
|
||
|
||
leave:
|
||
xfree (buffer);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a C-string from STREAM, store copy in STRING. */
|
||
static gpg_error_t
|
||
stream_read_cstring (estream_t stream, char **string)
|
||
{
|
||
return stream_read_string (stream, 0, (unsigned char **)string, NULL);
|
||
}
|
||
|
||
|
||
/* Write a binary string from STRING of size STRING_N to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_string (estream_t stream,
|
||
const unsigned char *string, u32 string_n)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
err = stream_write_uint32 (stream, string_n);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_data (stream, string, string_n);
|
||
|
||
out:
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Write a C-string from STRING to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_cstring (estream_t stream, const char *string)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
err = stream_write_string (stream,
|
||
(const unsigned char *) string, strlen (string));
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Read an MPI from STREAM, store it in MPINT. Depending on SECURE
|
||
use secure memory. */
|
||
static gpg_error_t
|
||
stream_read_mpi (estream_t stream, unsigned int secure, gcry_mpi_t *mpint)
|
||
{
|
||
unsigned char *mpi_data;
|
||
u32 mpi_data_size;
|
||
gpg_error_t err;
|
||
gcry_mpi_t mpi;
|
||
|
||
mpi_data = NULL;
|
||
|
||
err = stream_read_string (stream, secure, &mpi_data, &mpi_data_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* To avoid excessive use of secure memory we check that an MPI is
|
||
not too large. */
|
||
if (mpi_data_size > 520)
|
||
{
|
||
log_error (_("ssh keys greater than %d bits are not supported\n"), 4096);
|
||
err = GPG_ERR_TOO_LARGE;
|
||
goto out;
|
||
}
|
||
|
||
err = gcry_mpi_scan (&mpi, GCRYMPI_FMT_STD, mpi_data, mpi_data_size, NULL);
|
||
if (err)
|
||
goto out;
|
||
|
||
*mpint = mpi;
|
||
|
||
out:
|
||
|
||
xfree (mpi_data);
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Write the MPI contained in MPINT to STREAM. */
|
||
static gpg_error_t
|
||
stream_write_mpi (estream_t stream, gcry_mpi_t mpint)
|
||
{
|
||
unsigned char *mpi_buffer;
|
||
size_t mpi_buffer_n;
|
||
gpg_error_t err;
|
||
|
||
mpi_buffer = NULL;
|
||
|
||
err = gcry_mpi_aprint (GCRYMPI_FMT_STD, &mpi_buffer, &mpi_buffer_n, mpint);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_string (stream, mpi_buffer, mpi_buffer_n);
|
||
|
||
out:
|
||
|
||
xfree (mpi_buffer);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Copy data from SRC to DST until EOF is reached. */
|
||
static gpg_error_t
|
||
stream_copy (estream_t dst, estream_t src)
|
||
{
|
||
char buffer[BUFSIZ];
|
||
size_t bytes_read;
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
err = 0;
|
||
while (1)
|
||
{
|
||
ret = es_read (src, buffer, sizeof (buffer), &bytes_read);
|
||
if (ret || (! bytes_read))
|
||
{
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
break;
|
||
}
|
||
ret = es_write (dst, buffer, bytes_read, NULL);
|
||
if (ret)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
break;
|
||
}
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Open the ssh control file and create it if not available. With
|
||
APPEND passed as true the file will be opened in append mode,
|
||
otherwise in read only mode. On success 0 is returned and a new
|
||
control file object stored at R_CF. On error an error code is
|
||
returned and NULL is stored at R_CF. */
|
||
static gpg_error_t
|
||
open_control_file (ssh_control_file_t *r_cf, int append)
|
||
{
|
||
gpg_error_t err;
|
||
ssh_control_file_t cf;
|
||
|
||
cf = xtrycalloc (1, sizeof *cf);
|
||
if (!cf)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
/* Note: As soon as we start to use non blocking functions here
|
||
(i.e. where Pth might switch threads) we need to employ a
|
||
mutex. */
|
||
cf->fname = make_filename_try (gnupg_homedir (), SSH_CONTROL_FILE_NAME, NULL);
|
||
if (!cf->fname)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
/* FIXME: With "a+" we are not able to check whether this will
|
||
be created and thus the blurb needs to be written first. */
|
||
cf->fp = es_fopen (cf->fname, append? "a+":"r");
|
||
if (!cf->fp && errno == ENOENT)
|
||
{
|
||
estream_t stream = es_fopen (cf->fname, "wx,mode=-rw-r");
|
||
if (!stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error (_("can't create '%s': %s\n"),
|
||
cf->fname, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
es_fputs (sshcontrolblurb, stream);
|
||
es_fclose (stream);
|
||
cf->fp = es_fopen (cf->fname, append? "a+":"r");
|
||
}
|
||
|
||
if (!cf->fp)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
log_error (_("can't open '%s': %s\n"),
|
||
cf->fname, gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
|
||
err = 0;
|
||
|
||
leave:
|
||
if (err && cf)
|
||
{
|
||
if (cf->fp)
|
||
es_fclose (cf->fp);
|
||
xfree (cf->fname);
|
||
xfree (cf);
|
||
}
|
||
else
|
||
*r_cf = cf;
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
static void
|
||
rewind_control_file (ssh_control_file_t cf)
|
||
{
|
||
es_fseek (cf->fp, 0, SEEK_SET);
|
||
cf->lnr = 0;
|
||
es_clearerr (cf->fp);
|
||
}
|
||
|
||
|
||
static void
|
||
close_control_file (ssh_control_file_t cf)
|
||
{
|
||
if (!cf)
|
||
return;
|
||
es_fclose (cf->fp);
|
||
xfree (cf->fname);
|
||
xfree (cf);
|
||
}
|
||
|
||
|
||
|
||
/* Read the next line from the control file and store the data in CF.
|
||
Returns 0 on success, GPG_ERR_EOF on EOF, or other error codes. */
|
||
static gpg_error_t
|
||
read_control_file_item (ssh_control_file_t cf)
|
||
{
|
||
int c, i, n;
|
||
char *p, *pend, line[256];
|
||
long ttl = 0;
|
||
|
||
cf->item.valid = 0;
|
||
es_clearerr (cf->fp);
|
||
|
||
do
|
||
{
|
||
if (!es_fgets (line, DIM(line)-1, cf->fp) )
|
||
{
|
||
if (es_feof (cf->fp))
|
||
return gpg_error (GPG_ERR_EOF);
|
||
return gpg_error_from_syserror ();
|
||
}
|
||
cf->lnr++;
|
||
|
||
if (!*line || line[strlen(line)-1] != '\n')
|
||
{
|
||
/* Eat until end of line */
|
||
while ((c = es_getc (cf->fp)) != EOF && c != '\n')
|
||
;
|
||
return gpg_error (*line? GPG_ERR_LINE_TOO_LONG
|
||
: GPG_ERR_INCOMPLETE_LINE);
|
||
}
|
||
|
||
/* Allow for empty lines and spaces */
|
||
for (p=line; spacep (p); p++)
|
||
;
|
||
}
|
||
while (!*p || *p == '\n' || *p == '#');
|
||
|
||
cf->item.disabled = 0;
|
||
if (*p == '!')
|
||
{
|
||
cf->item.disabled = 1;
|
||
for (p++; spacep (p); p++)
|
||
;
|
||
}
|
||
|
||
for (i=0; hexdigitp (p) && i < 40; p++, i++)
|
||
cf->item.hexgrip[i] = (*p >= 'a'? (*p & 0xdf): *p);
|
||
cf->item.hexgrip[i] = 0;
|
||
if (i != 40 || !(spacep (p) || *p == '\n'))
|
||
{
|
||
log_error ("%s:%d: invalid formatted line\n", cf->fname, cf->lnr);
|
||
return gpg_error (GPG_ERR_BAD_DATA);
|
||
}
|
||
|
||
ttl = strtol (p, &pend, 10);
|
||
p = pend;
|
||
if (!(spacep (p) || *p == '\n') || (int)ttl < -1)
|
||
{
|
||
log_error ("%s:%d: invalid TTL value; assuming 0\n", cf->fname, cf->lnr);
|
||
cf->item.ttl = 0;
|
||
}
|
||
cf->item.ttl = ttl;
|
||
|
||
/* Now check for key-value pairs of the form NAME[=VALUE]. */
|
||
cf->item.confirm = 0;
|
||
while (*p)
|
||
{
|
||
for (; spacep (p) && *p != '\n'; p++)
|
||
;
|
||
if (!*p || *p == '\n')
|
||
break;
|
||
n = strcspn (p, "= \t\n");
|
||
if (p[n] == '=')
|
||
{
|
||
log_error ("%s:%d: assigning a value to a flag is not yet supported; "
|
||
"flag ignored\n", cf->fname, cf->lnr);
|
||
p++;
|
||
}
|
||
else if (n == 7 && !memcmp (p, "confirm", 7))
|
||
{
|
||
cf->item.confirm = 1;
|
||
}
|
||
else
|
||
log_error ("%s:%d: invalid flag '%.*s'; ignored\n",
|
||
cf->fname, cf->lnr, n, p);
|
||
p += n;
|
||
}
|
||
|
||
/* log_debug ("%s:%d: grip=%s ttl=%d%s%s\n", */
|
||
/* cf->fname, cf->lnr, */
|
||
/* cf->item.hexgrip, cf->item.ttl, */
|
||
/* cf->item.disabled? " disabled":"", */
|
||
/* cf->item.confirm? " confirm":""); */
|
||
|
||
cf->item.valid = 1;
|
||
return 0; /* Okay: valid entry found. */
|
||
}
|
||
|
||
|
||
|
||
/* Search the control file CF from the beginning until a matching
|
||
HEXGRIP is found; return success in this case and store true at
|
||
DISABLED if the found key has been disabled. If R_TTL is not NULL
|
||
a specified TTL for that key is stored there. If R_CONFIRM is not
|
||
NULL it is set to 1 if the key has the confirm flag set. The line
|
||
number where the item was found is stored at R_LNR. */
|
||
static gpg_error_t
|
||
search_control_file (ssh_control_file_t cf, const char *hexgrip,
|
||
int *r_disabled, int *r_ttl, int *r_confirm, int *r_lnr)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
log_assert (strlen (hexgrip) == 40 );
|
||
|
||
if (r_disabled)
|
||
*r_disabled = 0;
|
||
if (r_ttl)
|
||
*r_ttl = 0;
|
||
if (r_confirm)
|
||
*r_confirm = 0;
|
||
if (r_lnr)
|
||
*r_lnr = -1;
|
||
|
||
rewind_control_file (cf);
|
||
while (!(err=read_control_file_item (cf)))
|
||
{
|
||
if (!cf->item.valid)
|
||
continue; /* Should not happen. */
|
||
if (!strcmp (hexgrip, cf->item.hexgrip))
|
||
break;
|
||
}
|
||
if (!err)
|
||
{
|
||
if (r_disabled)
|
||
*r_disabled = cf->item.disabled;
|
||
if (r_ttl)
|
||
*r_ttl = cf->item.ttl;
|
||
if (r_confirm)
|
||
*r_confirm = cf->item.confirm;
|
||
if (r_lnr)
|
||
*r_lnr = cf->lnr;
|
||
}
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* Add an entry to the control file to mark the key with the keygrip
|
||
HEXGRIP as usable for SSH; i.e. it will be returned when ssh asks
|
||
for it. FMTFPR is the fingerprint string. This function is in
|
||
general used to add a key received through the ssh-add function.
|
||
We can assume that the user wants to allow ssh using this key. */
|
||
static gpg_error_t
|
||
add_control_entry (ctrl_t ctrl, ssh_key_type_spec_t *spec,
|
||
const char *hexgrip, gcry_sexp_t key,
|
||
int ttl, int confirm)
|
||
{
|
||
gpg_error_t err;
|
||
ssh_control_file_t cf;
|
||
int disabled;
|
||
char *fpr_md5 = NULL;
|
||
char *fpr_sha256 = NULL;
|
||
|
||
(void)ctrl;
|
||
|
||
err = open_control_file (&cf, 1);
|
||
if (err)
|
||
return err;
|
||
|
||
err = search_control_file (cf, hexgrip, &disabled, NULL, NULL, NULL);
|
||
if (err && gpg_err_code(err) == GPG_ERR_EOF)
|
||
{
|
||
struct tm *tp;
|
||
time_t atime = time (NULL);
|
||
|
||
err = ssh_get_fingerprint_string (key, GCRY_MD_MD5, &fpr_md5);
|
||
/* ignore the errors as MD5 is not available in FIPS mode */
|
||
if (err)
|
||
fpr_md5 = NULL;
|
||
|
||
err = ssh_get_fingerprint_string (key, GCRY_MD_SHA256, &fpr_sha256);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Not yet in the file - add it. Because the file has been
|
||
opened in append mode, we simply need to write to it. */
|
||
tp = localtime (&atime);
|
||
es_fprintf (cf->fp,
|
||
("# %s key added on: %04d-%02d-%02d %02d:%02d:%02d\n"
|
||
"# Fingerprints: %s\n"
|
||
"# %s\n"
|
||
"%s %d%s\n"),
|
||
spec->name,
|
||
1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
|
||
tp->tm_hour, tp->tm_min, tp->tm_sec,
|
||
fpr_md5? fpr_md5:"", fpr_sha256, hexgrip, ttl,
|
||
confirm? " confirm":"");
|
||
|
||
}
|
||
out:
|
||
xfree (fpr_md5);
|
||
xfree (fpr_sha256);
|
||
close_control_file (cf);
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Scan the sshcontrol file and return the TTL. */
|
||
static int
|
||
ttl_from_sshcontrol (const char *hexgrip)
|
||
{
|
||
ssh_control_file_t cf;
|
||
int disabled, ttl;
|
||
|
||
if (!hexgrip || strlen (hexgrip) != 40)
|
||
return 0; /* Wrong input: Use global default. */
|
||
|
||
if (open_control_file (&cf, 0))
|
||
return 0; /* Error: Use the global default TTL. */
|
||
|
||
if (search_control_file (cf, hexgrip, &disabled, &ttl, NULL, NULL)
|
||
|| disabled)
|
||
ttl = 0; /* Use the global default if not found or disabled. */
|
||
|
||
close_control_file (cf);
|
||
|
||
return ttl;
|
||
}
|
||
|
||
|
||
/* Scan the sshcontrol file and return the confirm flag. */
|
||
static int
|
||
confirm_flag_from_sshcontrol (const char *hexgrip)
|
||
{
|
||
ssh_control_file_t cf;
|
||
int disabled, confirm;
|
||
|
||
if (!hexgrip || strlen (hexgrip) != 40)
|
||
return 1; /* Wrong input: Better ask for confirmation. */
|
||
|
||
if (open_control_file (&cf, 0))
|
||
return 1; /* Error: Better ask for confirmation. */
|
||
|
||
if (search_control_file (cf, hexgrip, &disabled, NULL, &confirm, NULL)
|
||
|| disabled)
|
||
confirm = 0; /* If not found or disabled, there is no reason to
|
||
ask for confirmation. */
|
||
|
||
close_control_file (cf);
|
||
|
||
return confirm;
|
||
}
|
||
|
||
|
||
|
||
|
||
/* Open the ssh control file for reading. This is a public version of
|
||
open_control_file. The caller must use ssh_close_control_file to
|
||
release the returned handle. */
|
||
ssh_control_file_t
|
||
ssh_open_control_file (void)
|
||
{
|
||
ssh_control_file_t cf;
|
||
|
||
/* Then look at all the registered and non-disabled keys. */
|
||
if (open_control_file (&cf, 0))
|
||
return NULL;
|
||
return cf;
|
||
}
|
||
|
||
/* Close an ssh control file handle. This is the public version of
|
||
close_control_file. CF may be NULL. */
|
||
void
|
||
ssh_close_control_file (ssh_control_file_t cf)
|
||
{
|
||
close_control_file (cf);
|
||
}
|
||
|
||
/* Read the next item from the ssh control file. The function returns
|
||
0 if a item was read, GPG_ERR_EOF on eof or another error value.
|
||
R_HEXGRIP shall either be null or a BUFFER of at least 41 byte.
|
||
R_DISABLED, R_TTLm and R_CONFIRM return flags from the control
|
||
file; they are only set on success. */
|
||
gpg_error_t
|
||
ssh_read_control_file (ssh_control_file_t cf,
|
||
char *r_hexgrip,
|
||
int *r_disabled, int *r_ttl, int *r_confirm)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
do
|
||
err = read_control_file_item (cf);
|
||
while (!err && !cf->item.valid);
|
||
if (!err)
|
||
{
|
||
if (r_hexgrip)
|
||
strcpy (r_hexgrip, cf->item.hexgrip);
|
||
if (r_disabled)
|
||
*r_disabled = cf->item.disabled;
|
||
if (r_ttl)
|
||
*r_ttl = cf->item.ttl;
|
||
if (r_confirm)
|
||
*r_confirm = cf->item.confirm;
|
||
}
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Search for a key with HEXGRIP in sshcontrol and return all
|
||
info. */
|
||
gpg_error_t
|
||
ssh_search_control_file (ssh_control_file_t cf,
|
||
const char *hexgrip,
|
||
int *r_disabled, int *r_ttl, int *r_confirm)
|
||
{
|
||
gpg_error_t err;
|
||
int i;
|
||
const char *s;
|
||
char uphexgrip[41];
|
||
|
||
/* We need to make sure that HEXGRIP is all uppercase. The easiest
|
||
way to do this and also check its length is by copying to a
|
||
second buffer. */
|
||
for (i=0, s=hexgrip; i < 40 && *s; s++, i++)
|
||
uphexgrip[i] = *s >= 'a'? (*s & 0xdf): *s;
|
||
uphexgrip[i] = 0;
|
||
if (i != 40)
|
||
err = gpg_error (GPG_ERR_INV_LENGTH);
|
||
else
|
||
err = search_control_file (cf, uphexgrip, r_disabled, r_ttl, r_confirm,
|
||
NULL);
|
||
if (gpg_err_code (err) == GPG_ERR_EOF)
|
||
err = gpg_error (GPG_ERR_NOT_FOUND);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
|
||
/*
|
||
|
||
MPI lists.
|
||
|
||
*/
|
||
|
||
/* Free the list of MPIs MPI_LIST. */
|
||
static void
|
||
mpint_list_free (gcry_mpi_t *mpi_list)
|
||
{
|
||
if (mpi_list)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0; mpi_list[i]; i++)
|
||
gcry_mpi_release (mpi_list[i]);
|
||
xfree (mpi_list);
|
||
}
|
||
}
|
||
|
||
/* Receive key material MPIs from STREAM according to KEY_SPEC;
|
||
depending on SECRET expect a public key or secret key. CERT is the
|
||
certificate blob used if KEY_SPEC indicates the certificate format;
|
||
it needs to be positioned to the end of the nonce. The newly
|
||
allocated list of MPIs is stored in MPI_LIST. Returns usual error
|
||
code. */
|
||
static gpg_error_t
|
||
ssh_receive_mpint_list (estream_t stream, int secret,
|
||
ssh_key_type_spec_t *spec, estream_t cert,
|
||
gcry_mpi_t **mpi_list)
|
||
{
|
||
const char *elems_public;
|
||
unsigned int elems_n;
|
||
const char *elems;
|
||
int elem_is_secret;
|
||
gcry_mpi_t *mpis = NULL;
|
||
gpg_error_t err = 0;
|
||
unsigned int i;
|
||
|
||
if (secret)
|
||
elems = spec->elems_key_secret;
|
||
else
|
||
elems = spec->elems_key_public;
|
||
elems_n = strlen (elems);
|
||
elems_public = spec->elems_key_public;
|
||
|
||
/* Check that either both, CERT and the WITH_CERT flag, are given or
|
||
none of them. */
|
||
if (!(!!(spec->flags & SPEC_FLAG_WITH_CERT) ^ !cert))
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_CERT_OBJ);
|
||
goto out;
|
||
}
|
||
|
||
mpis = xtrycalloc (elems_n + 1, sizeof *mpis );
|
||
if (!mpis)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
elem_is_secret = 0;
|
||
for (i = 0; i < elems_n; i++)
|
||
{
|
||
if (secret)
|
||
elem_is_secret = !strchr (elems_public, elems[i]);
|
||
|
||
if (cert && !elem_is_secret)
|
||
err = stream_read_mpi (cert, elem_is_secret, &mpis[i]);
|
||
else
|
||
err = stream_read_mpi (stream, elem_is_secret, &mpis[i]);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
*mpi_list = mpis;
|
||
mpis = NULL;
|
||
|
||
out:
|
||
if (err)
|
||
mpint_list_free (mpis);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* Key modifier function for RSA. */
|
||
static gpg_error_t
|
||
ssh_key_modifier_rsa (const char *elems, gcry_mpi_t *mpis)
|
||
{
|
||
gcry_mpi_t p;
|
||
gcry_mpi_t q;
|
||
gcry_mpi_t u;
|
||
|
||
if (strcmp (elems, "nedupq"))
|
||
/* Modifying only necessary for secret keys. */
|
||
goto out;
|
||
|
||
u = mpis[3];
|
||
p = mpis[4];
|
||
q = mpis[5];
|
||
|
||
if (gcry_mpi_cmp (p, q) > 0)
|
||
{
|
||
/* P shall be smaller then Q! Swap primes. iqmp becomes u. */
|
||
gcry_mpi_t tmp;
|
||
|
||
tmp = mpis[4];
|
||
mpis[4] = mpis[5];
|
||
mpis[5] = tmp;
|
||
}
|
||
else
|
||
/* U needs to be recomputed. */
|
||
gcry_mpi_invm (u, p, q);
|
||
|
||
out:
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Signature encoder function for RSA. */
|
||
static gpg_error_t
|
||
ssh_signature_encoder_rsa (ssh_key_type_spec_t *spec,
|
||
estream_t signature_blob,
|
||
gcry_sexp_t s_signature)
|
||
{
|
||
gpg_error_t err = 0;
|
||
gcry_sexp_t valuelist = NULL;
|
||
gcry_sexp_t sublist = NULL;
|
||
gcry_mpi_t sig_value = NULL;
|
||
gcry_mpi_t *mpis = NULL;
|
||
const char *elems;
|
||
size_t elems_n;
|
||
int i;
|
||
|
||
unsigned char *data;
|
||
size_t data_n;
|
||
gcry_mpi_t s;
|
||
|
||
valuelist = gcry_sexp_nth (s_signature, 1);
|
||
if (!valuelist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
elems = spec->elems_signature;
|
||
elems_n = strlen (elems);
|
||
|
||
mpis = xtrycalloc (elems_n + 1, sizeof *mpis);
|
||
if (!mpis)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
for (i = 0; i < elems_n; i++)
|
||
{
|
||
sublist = gcry_sexp_find_token (valuelist, spec->elems_signature + i, 1);
|
||
if (!sublist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
break;
|
||
}
|
||
|
||
sig_value = gcry_sexp_nth_mpi (sublist, 1, GCRYMPI_FMT_USG);
|
||
if (!sig_value)
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
|
||
break;
|
||
}
|
||
gcry_sexp_release (sublist);
|
||
sublist = NULL;
|
||
|
||
mpis[i] = sig_value;
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
/* RSA specific */
|
||
s = mpis[0];
|
||
|
||
err = gcry_mpi_aprint (GCRYMPI_FMT_USG, &data, &data_n, s);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_string (signature_blob, data, data_n);
|
||
xfree (data);
|
||
|
||
out:
|
||
gcry_sexp_release (valuelist);
|
||
gcry_sexp_release (sublist);
|
||
mpint_list_free (mpis);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Signature encoder function for DSA. */
|
||
static gpg_error_t
|
||
ssh_signature_encoder_dsa (ssh_key_type_spec_t *spec,
|
||
estream_t signature_blob,
|
||
gcry_sexp_t s_signature)
|
||
{
|
||
gpg_error_t err = 0;
|
||
gcry_sexp_t valuelist = NULL;
|
||
gcry_sexp_t sublist = NULL;
|
||
gcry_mpi_t sig_value = NULL;
|
||
gcry_mpi_t *mpis = NULL;
|
||
const char *elems;
|
||
size_t elems_n;
|
||
int i;
|
||
|
||
unsigned char buffer[SSH_DSA_SIGNATURE_PADDING * SSH_DSA_SIGNATURE_ELEMS];
|
||
unsigned char *data = NULL;
|
||
size_t data_n;
|
||
|
||
valuelist = gcry_sexp_nth (s_signature, 1);
|
||
if (!valuelist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
elems = spec->elems_signature;
|
||
elems_n = strlen (elems);
|
||
|
||
mpis = xtrycalloc (elems_n + 1, sizeof *mpis);
|
||
if (!mpis)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
for (i = 0; i < elems_n; i++)
|
||
{
|
||
sublist = gcry_sexp_find_token (valuelist, spec->elems_signature + i, 1);
|
||
if (!sublist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
break;
|
||
}
|
||
|
||
sig_value = gcry_sexp_nth_mpi (sublist, 1, GCRYMPI_FMT_USG);
|
||
if (!sig_value)
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
|
||
break;
|
||
}
|
||
gcry_sexp_release (sublist);
|
||
sublist = NULL;
|
||
|
||
mpis[i] = sig_value;
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
/* DSA specific code. */
|
||
|
||
/* FIXME: Why this complicated code? Why collecting both mpis in a
|
||
buffer instead of writing them out one after the other? */
|
||
for (i = 0; i < 2; i++)
|
||
{
|
||
err = gcry_mpi_aprint (GCRYMPI_FMT_USG, &data, &data_n, mpis[i]);
|
||
if (err)
|
||
break;
|
||
|
||
if (data_n > SSH_DSA_SIGNATURE_PADDING)
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
|
||
break;
|
||
}
|
||
|
||
memset (buffer + (i * SSH_DSA_SIGNATURE_PADDING), 0,
|
||
SSH_DSA_SIGNATURE_PADDING - data_n);
|
||
memcpy (buffer + (i * SSH_DSA_SIGNATURE_PADDING)
|
||
+ (SSH_DSA_SIGNATURE_PADDING - data_n), data, data_n);
|
||
|
||
xfree (data);
|
||
data = NULL;
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_string (signature_blob, buffer, sizeof (buffer));
|
||
|
||
out:
|
||
xfree (data);
|
||
gcry_sexp_release (valuelist);
|
||
gcry_sexp_release (sublist);
|
||
mpint_list_free (mpis);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Signature encoder function for ECDSA. */
|
||
static gpg_error_t
|
||
ssh_signature_encoder_ecdsa (ssh_key_type_spec_t *spec,
|
||
estream_t stream, gcry_sexp_t s_signature)
|
||
{
|
||
gpg_error_t err = 0;
|
||
gcry_sexp_t valuelist = NULL;
|
||
gcry_sexp_t sublist = NULL;
|
||
gcry_mpi_t sig_value = NULL;
|
||
gcry_mpi_t *mpis = NULL;
|
||
const char *elems;
|
||
size_t elems_n;
|
||
int i;
|
||
|
||
unsigned char *data[2] = {NULL, NULL};
|
||
size_t data_n[2];
|
||
size_t innerlen;
|
||
|
||
valuelist = gcry_sexp_nth (s_signature, 1);
|
||
if (!valuelist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
elems = spec->elems_signature;
|
||
elems_n = strlen (elems);
|
||
|
||
mpis = xtrycalloc (elems_n + 1, sizeof *mpis);
|
||
if (!mpis)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
for (i = 0; i < elems_n; i++)
|
||
{
|
||
sublist = gcry_sexp_find_token (valuelist, spec->elems_signature + i, 1);
|
||
if (!sublist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
break;
|
||
}
|
||
|
||
sig_value = gcry_sexp_nth_mpi (sublist, 1, GCRYMPI_FMT_USG);
|
||
if (!sig_value)
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
|
||
break;
|
||
}
|
||
gcry_sexp_release (sublist);
|
||
sublist = NULL;
|
||
|
||
mpis[i] = sig_value;
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
/* ECDSA specific */
|
||
|
||
innerlen = 0;
|
||
for (i = 0; i < DIM(data); i++)
|
||
{
|
||
err = gcry_mpi_aprint (GCRYMPI_FMT_STD, &data[i], &data_n[i], mpis[i]);
|
||
if (err)
|
||
goto out;
|
||
innerlen += 4 + data_n[i];
|
||
}
|
||
|
||
err = stream_write_uint32 (stream, innerlen);
|
||
if (err)
|
||
goto out;
|
||
|
||
for (i = 0; i < DIM(data); i++)
|
||
{
|
||
err = stream_write_string (stream, data[i], data_n[i]);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
out:
|
||
for (i = 0; i < DIM(data); i++)
|
||
xfree (data[i]);
|
||
gcry_sexp_release (valuelist);
|
||
gcry_sexp_release (sublist);
|
||
mpint_list_free (mpis);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Signature encoder function for EdDSA. */
|
||
static gpg_error_t
|
||
ssh_signature_encoder_eddsa (ssh_key_type_spec_t *spec,
|
||
estream_t stream, gcry_sexp_t s_signature)
|
||
{
|
||
gpg_error_t err = 0;
|
||
gcry_sexp_t valuelist = NULL;
|
||
gcry_sexp_t sublist = NULL;
|
||
const char *elems;
|
||
size_t elems_n;
|
||
int i;
|
||
|
||
unsigned char *data[2] = {NULL, NULL};
|
||
size_t data_n[2];
|
||
size_t totallen = 0;
|
||
|
||
valuelist = gcry_sexp_nth (s_signature, 1);
|
||
if (!valuelist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
elems = spec->elems_signature;
|
||
elems_n = strlen (elems);
|
||
|
||
if (elems_n != DIM(data))
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
for (i = 0; i < DIM(data); i++)
|
||
{
|
||
sublist = gcry_sexp_find_token (valuelist, spec->elems_signature + i, 1);
|
||
if (!sublist)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
break;
|
||
}
|
||
|
||
data[i] = gcry_sexp_nth_buffer (sublist, 1, &data_n[i]);
|
||
if (!data[i])
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
|
||
break;
|
||
}
|
||
totallen += data_n[i];
|
||
gcry_sexp_release (sublist);
|
||
sublist = NULL;
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_uint32 (stream, totallen);
|
||
if (err)
|
||
goto out;
|
||
|
||
for (i = 0; i < DIM(data); i++)
|
||
{
|
||
err = stream_write_data (stream, data[i], data_n[i]);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
out:
|
||
for (i = 0; i < DIM(data); i++)
|
||
xfree (data[i]);
|
||
gcry_sexp_release (valuelist);
|
||
gcry_sexp_release (sublist);
|
||
return err;
|
||
}
|
||
|
||
|
||
/*
|
||
S-Expressions.
|
||
*/
|
||
|
||
|
||
/* This function constructs a new S-Expression for the key identified
|
||
by the KEY_SPEC, SECRET, CURVE_NAME, MPIS, and COMMENT, which is to
|
||
be stored at R_SEXP. Returns an error code. */
|
||
static gpg_error_t
|
||
sexp_key_construct (gcry_sexp_t *r_sexp,
|
||
ssh_key_type_spec_t key_spec, int secret,
|
||
const char *curve_name, gcry_mpi_t *mpis,
|
||
const char *comment)
|
||
{
|
||
gpg_error_t err;
|
||
gcry_sexp_t sexp_new = NULL;
|
||
void *formatbuf = NULL;
|
||
void **arg_list = NULL;
|
||
estream_t format = NULL;
|
||
char *algo_name = NULL;
|
||
|
||
/* We can't encode an empty string in an S-expression, thus to keep
|
||
* the code simple we use "(none)" instead. */
|
||
if (!comment || !*comment)
|
||
comment = "(none)";
|
||
|
||
if ((key_spec.flags & SPEC_FLAG_IS_EdDSA))
|
||
{
|
||
/* It is much easier and more readable to use a separate code
|
||
path for EdDSA. */
|
||
if (!curve_name)
|
||
err = gpg_error (GPG_ERR_INV_CURVE);
|
||
else if (!mpis[0] || !gcry_mpi_get_flag (mpis[0], GCRYMPI_FLAG_OPAQUE))
|
||
err = gpg_error (GPG_ERR_BAD_PUBKEY);
|
||
else if (secret
|
||
&& (!mpis[1]
|
||
|| !gcry_mpi_get_flag (mpis[1], GCRYMPI_FLAG_OPAQUE)))
|
||
err = gpg_error (GPG_ERR_BAD_SECKEY);
|
||
else if (secret)
|
||
err = gcry_sexp_build (&sexp_new, NULL,
|
||
"(private-key(ecc(curve %s)"
|
||
"(flags eddsa)(q %m)(d %m))"
|
||
"(comment%s))",
|
||
curve_name,
|
||
mpis[0], mpis[1],
|
||
comment);
|
||
else
|
||
err = gcry_sexp_build (&sexp_new, NULL,
|
||
"(public-key(ecc(curve %s)"
|
||
"(flags eddsa)(q %m))"
|
||
"(comment%s))",
|
||
curve_name,
|
||
mpis[0],
|
||
comment);
|
||
|
||
}
|
||
else
|
||
{
|
||
const char *key_identifier[] = { "public-key", "private-key" };
|
||
int arg_idx;
|
||
const char *elems;
|
||
size_t elems_n;
|
||
unsigned int i, j;
|
||
|
||
if (secret)
|
||
elems = key_spec.elems_sexp_order;
|
||
else
|
||
elems = key_spec.elems_key_public;
|
||
elems_n = strlen (elems);
|
||
|
||
format = es_fopenmem (0, "a+b");
|
||
if (!format)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
/* Key identifier, algorithm identifier, mpis, comment, and a NULL
|
||
as a safeguard. */
|
||
arg_list = xtrymalloc (sizeof (*arg_list) * (2 + 1 + elems_n + 1 + 1));
|
||
if (!arg_list)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
arg_idx = 0;
|
||
|
||
es_fputs ("(%s(%s", format);
|
||
arg_list[arg_idx++] = &key_identifier[secret];
|
||
algo_name = xtrystrdup (gcry_pk_algo_name (key_spec.algo));
|
||
if (!algo_name)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
strlwr (algo_name);
|
||
arg_list[arg_idx++] = &algo_name;
|
||
if (curve_name)
|
||
{
|
||
es_fputs ("(curve%s)", format);
|
||
arg_list[arg_idx++] = &curve_name;
|
||
}
|
||
|
||
for (i = 0; i < elems_n; i++)
|
||
{
|
||
es_fprintf (format, "(%c%%m)", elems[i]);
|
||
if (secret)
|
||
{
|
||
for (j = 0; j < elems_n; j++)
|
||
if (key_spec.elems_key_secret[j] == elems[i])
|
||
break;
|
||
}
|
||
else
|
||
j = i;
|
||
arg_list[arg_idx++] = &mpis[j];
|
||
}
|
||
es_fputs (")(comment%s))", format);
|
||
arg_list[arg_idx++] = &comment;
|
||
arg_list[arg_idx] = NULL;
|
||
|
||
es_putc (0, format);
|
||
if (es_ferror (format))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
if (es_fclose_snatch (format, &formatbuf, NULL))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
format = NULL;
|
||
|
||
err = gcry_sexp_build_array (&sexp_new, NULL, formatbuf, arg_list);
|
||
}
|
||
|
||
if (!err)
|
||
*r_sexp = sexp_new;
|
||
|
||
out:
|
||
es_fclose (format);
|
||
xfree (arg_list);
|
||
xfree (formatbuf);
|
||
xfree (algo_name);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* This function extracts the key from the s-expression SEXP according
|
||
to KEY_SPEC and stores it in ssh format at (R_BLOB, R_BLOBLEN). If
|
||
WITH_SECRET is true, the secret key parts are also extracted if
|
||
possible. Returns 0 on success or an error code. Note that data
|
||
stored at R_BLOB must be freed using es_free! */
|
||
static gpg_error_t
|
||
ssh_key_to_blob (gcry_sexp_t sexp, int with_secret,
|
||
ssh_key_type_spec_t key_spec,
|
||
void **r_blob, size_t *r_blob_size)
|
||
{
|
||
gpg_error_t err = 0;
|
||
gcry_sexp_t value_list = NULL;
|
||
gcry_sexp_t value_pair = NULL;
|
||
estream_t stream = NULL;
|
||
void *blob = NULL;
|
||
size_t blob_size;
|
||
const char *elems, *p_elems;
|
||
const char *data;
|
||
size_t datalen;
|
||
|
||
*r_blob = NULL;
|
||
*r_blob_size = 0;
|
||
|
||
stream = es_fopenmem (0, "r+b");
|
||
if (!stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
/* Get the type of the key expression. */
|
||
data = gcry_sexp_nth_data (sexp, 0, &datalen);
|
||
if (!data)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
if ((datalen == 10 && !strncmp (data, "public-key", 10))
|
||
|| (datalen == 21 && !strncmp (data, "protected-private-key", 21))
|
||
|| (datalen == 20 && !strncmp (data, "shadowed-private-key", 20)))
|
||
elems = key_spec.elems_key_public;
|
||
else if (datalen == 11 && !strncmp (data, "private-key", 11))
|
||
elems = with_secret? key_spec.elems_key_secret : key_spec.elems_key_public;
|
||
else
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
/* Get key value list. */
|
||
value_list = gcry_sexp_cadr (sexp);
|
||
if (!value_list)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
|
||
/* Write the ssh algorithm identifier. */
|
||
if ((key_spec.flags & SPEC_FLAG_IS_ECDSA))
|
||
{
|
||
/* Map the curve name to the ssh name. */
|
||
const char *name, *sshname, *canon_name;
|
||
|
||
name = gcry_pk_get_curve (sexp, 0, NULL);
|
||
if (!name)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_CURVE);
|
||
goto out;
|
||
}
|
||
|
||
sshname = ssh_identifier_from_curve_name (name, &canon_name);
|
||
if (!sshname)
|
||
{
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
goto out;
|
||
}
|
||
err = stream_write_cstring (stream, sshname);
|
||
if (err)
|
||
goto out;
|
||
err = stream_write_cstring (stream, canon_name);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
else
|
||
{
|
||
/* Note: This is also used for EdDSA. */
|
||
err = stream_write_cstring (stream, key_spec.ssh_identifier);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
/* Write the parameters. */
|
||
for (p_elems = elems; *p_elems; p_elems++)
|
||
{
|
||
gcry_sexp_release (value_pair);
|
||
value_pair = gcry_sexp_find_token (value_list, p_elems, 1);
|
||
if (!value_pair)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
if ((key_spec.flags & SPEC_FLAG_IS_EdDSA))
|
||
{
|
||
data = gcry_sexp_nth_data (value_pair, 1, &datalen);
|
||
if (!data)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
if (*p_elems == 'q' && (datalen & 1) && *data == 0x40)
|
||
{ /* Remove the prefix 0x40. */
|
||
data++;
|
||
datalen--;
|
||
}
|
||
err = stream_write_string (stream, data, datalen);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
else
|
||
{
|
||
gcry_mpi_t mpi;
|
||
|
||
/* Note that we need to use STD format; i.e. prepend a 0x00
|
||
to indicate a positive number if the high bit is set. */
|
||
mpi = gcry_sexp_nth_mpi (value_pair, 1, GCRYMPI_FMT_STD);
|
||
if (!mpi)
|
||
{
|
||
err = gpg_error (GPG_ERR_INV_SEXP);
|
||
goto out;
|
||
}
|
||
err = stream_write_mpi (stream, mpi);
|
||
gcry_mpi_release (mpi);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
if (es_fclose_snatch (stream, &blob, &blob_size))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
stream = NULL;
|
||
|
||
*r_blob = blob;
|
||
blob = NULL;
|
||
*r_blob_size = blob_size;
|
||
|
||
out:
|
||
gcry_sexp_release (value_list);
|
||
gcry_sexp_release (value_pair);
|
||
es_fclose (stream);
|
||
es_free (blob);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/*
|
||
|
||
Key I/O.
|
||
|
||
*/
|
||
|
||
/* Search for a key specification entry. If SSH_NAME is not NULL,
|
||
search for an entry whose "ssh_name" is equal to SSH_NAME;
|
||
otherwise, search for an entry whose algorithm is equal to ALGO.
|
||
Store found entry in SPEC on success, return error otherwise. */
|
||
static gpg_error_t
|
||
ssh_key_type_lookup (const char *ssh_name, int algo,
|
||
ssh_key_type_spec_t *spec)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < DIM (ssh_key_types); i++)
|
||
if ((ssh_name && (! strcmp (ssh_name, ssh_key_types[i].ssh_identifier)))
|
||
|| algo == ssh_key_types[i].algo)
|
||
break;
|
||
|
||
if (i == DIM (ssh_key_types))
|
||
err = gpg_error (GPG_ERR_NOT_FOUND);
|
||
else
|
||
{
|
||
*spec = ssh_key_types[i];
|
||
err = 0;
|
||
}
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Receive a key from STREAM, according to the key specification given
|
||
as KEY_SPEC. Depending on SECRET, receive a secret or a public
|
||
key. If READ_COMMENT is true, receive a comment string as well.
|
||
Constructs a new S-Expression from received data and stores it in
|
||
KEY_NEW. Returns zero on success or an error code. */
|
||
static gpg_error_t
|
||
ssh_receive_key (estream_t stream, gcry_sexp_t *key_new, int secret,
|
||
int read_comment, ssh_key_type_spec_t *key_spec)
|
||
{
|
||
gpg_error_t err;
|
||
char *key_type = NULL;
|
||
char *comment = NULL;
|
||
estream_t cert = NULL;
|
||
gcry_sexp_t key = NULL;
|
||
ssh_key_type_spec_t spec;
|
||
gcry_mpi_t *mpi_list = NULL;
|
||
const char *elems;
|
||
const char *curve_name = NULL;
|
||
|
||
|
||
err = stream_read_cstring (stream, &key_type);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_key_type_lookup (key_type, 0, &spec);
|
||
if (err)
|
||
goto out;
|
||
|
||
if ((spec.flags & SPEC_FLAG_WITH_CERT))
|
||
{
|
||
/* This is an OpenSSH certificate+private key. The certificate
|
||
is an SSH string and which we store in an estream object. */
|
||
unsigned char *buffer;
|
||
u32 buflen;
|
||
char *cert_key_type;
|
||
|
||
err = stream_read_string (stream, 0, &buffer, &buflen);
|
||
if (err)
|
||
goto out;
|
||
cert = es_fopenmem_init (0, "rb", buffer, buflen);
|
||
xfree (buffer);
|
||
if (!cert)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
/* Check that the key type matches. */
|
||
err = stream_read_cstring (cert, &cert_key_type);
|
||
if (err)
|
||
goto out;
|
||
if (strcmp (cert_key_type, key_type) )
|
||
{
|
||
xfree (cert_key_type);
|
||
log_error ("key types in received ssh certificate do not match\n");
|
||
err = gpg_error (GPG_ERR_INV_CERT_OBJ);
|
||
goto out;
|
||
}
|
||
xfree (cert_key_type);
|
||
|
||
/* Skip the nonce. */
|
||
err = stream_read_string (cert, 0, NULL, NULL);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
if ((spec.flags & SPEC_FLAG_IS_EdDSA))
|
||
{
|
||
/* The format of an EdDSA key is:
|
||
* string key_type ("ssh-ed25519")
|
||
* string public_key
|
||
* string private_key
|
||
*
|
||
* Note that the private key is the concatenation of the private
|
||
* key with the public key. Thus there's are 64 bytes; however
|
||
* we only want the real 32 byte private key - Libgcrypt expects
|
||
* this.
|
||
*/
|
||
|
||
/* For now, it's only Ed25519. In future, Ed448 will come. */
|
||
curve_name = "Ed25519";
|
||
|
||
mpi_list = xtrycalloc (3, sizeof *mpi_list);
|
||
if (!mpi_list)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
err = stream_read_blob (cert? cert : stream, 0, &mpi_list[0]);
|
||
if (err)
|
||
goto out;
|
||
if (secret)
|
||
{
|
||
u32 len = 0;
|
||
unsigned char *buffer;
|
||
|
||
/* Read string length. */
|
||
err = stream_read_uint32 (stream, &len);
|
||
if (err)
|
||
goto out;
|
||
if (len != 32 && len != 64)
|
||
{
|
||
err = gpg_error (GPG_ERR_BAD_SECKEY);
|
||
goto out;
|
||
}
|
||
buffer = xtrymalloc_secure (32);
|
||
if (!buffer)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
err = stream_read_data (stream, buffer, 32);
|
||
if (err)
|
||
{
|
||
xfree (buffer);
|
||
goto out;
|
||
}
|
||
mpi_list[1] = gcry_mpi_set_opaque (NULL, buffer, 8*32);
|
||
buffer = NULL;
|
||
if (len == 64)
|
||
{
|
||
err = stream_read_skip (stream, 32);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
}
|
||
}
|
||
else if ((spec.flags & SPEC_FLAG_IS_ECDSA))
|
||
{
|
||
/* The format of an ECDSA key is:
|
||
* string key_type ("ecdsa-sha2-nistp256" |
|
||
* "ecdsa-sha2-nistp384" |
|
||
* "ecdsa-sha2-nistp521" )
|
||
* string ecdsa_curve_name
|
||
* string ecdsa_public_key
|
||
* mpint ecdsa_private
|
||
*
|
||
* Note that we use the mpint reader instead of the string
|
||
* reader for ecsa_public_key. For the certificate variante
|
||
* ecdsa_curve_name+ecdsa_public_key are replaced by the
|
||
* certificate.
|
||
*/
|
||
unsigned char *buffer;
|
||
|
||
err = stream_read_string (cert? cert : stream, 0, &buffer, NULL);
|
||
if (err)
|
||
goto out;
|
||
/* Get the canonical name. Should be the same as the read
|
||
* string but we use this mapping to validate that name. */
|
||
if (!ssh_identifier_from_curve_name (buffer, &curve_name))
|
||
{
|
||
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
|
||
xfree (buffer);
|
||
goto out;
|
||
}
|
||
xfree (buffer);
|
||
|
||
err = ssh_receive_mpint_list (stream, secret, &spec, cert, &mpi_list);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
else
|
||
{
|
||
err = ssh_receive_mpint_list (stream, secret, &spec, cert, &mpi_list);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
if (read_comment)
|
||
{
|
||
err = stream_read_cstring (stream, &comment);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
if (secret)
|
||
elems = spec.elems_key_secret;
|
||
else
|
||
elems = spec.elems_key_public;
|
||
|
||
if (spec.key_modifier)
|
||
{
|
||
err = (*spec.key_modifier) (elems, mpi_list);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
err = sexp_key_construct (&key, spec, secret, curve_name, mpi_list,
|
||
comment? comment:"");
|
||
if (!err)
|
||
{
|
||
if (key_spec)
|
||
*key_spec = spec;
|
||
*key_new = key;
|
||
}
|
||
|
||
out:
|
||
es_fclose (cert);
|
||
mpint_list_free (mpi_list);
|
||
xfree (key_type);
|
||
xfree (comment);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Write the public key from KEY to STREAM in SSH key format. If
|
||
OVERRIDE_COMMENT is not NULL, it will be used instead of the
|
||
comment stored in the key. */
|
||
static gpg_error_t
|
||
ssh_send_key_public (estream_t stream, gcry_sexp_t key,
|
||
const char *override_comment)
|
||
{
|
||
ssh_key_type_spec_t spec;
|
||
int algo;
|
||
char *comment = NULL;
|
||
void *blob = NULL;
|
||
size_t bloblen;
|
||
gpg_error_t err = 0;
|
||
|
||
algo = get_pk_algo_from_key (key);
|
||
if (algo == 0)
|
||
goto out;
|
||
|
||
err = ssh_key_type_lookup (NULL, algo, &spec);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_key_to_blob (key, 0, spec, &blob, &bloblen);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = stream_write_string (stream, blob, bloblen);
|
||
if (err)
|
||
goto out;
|
||
|
||
if (override_comment)
|
||
err = stream_write_cstring (stream, override_comment);
|
||
else
|
||
{
|
||
err = ssh_key_extract_comment (key, &comment);
|
||
if (err)
|
||
err = stream_write_cstring (stream, "(none)");
|
||
else
|
||
err = stream_write_cstring (stream, comment);
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
out:
|
||
xfree (comment);
|
||
es_free (blob);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Read a public key out of BLOB/BLOB_SIZE according to the key
|
||
specification given as KEY_SPEC, storing the new key in KEY_PUBLIC.
|
||
Returns zero on success or an error code. */
|
||
static gpg_error_t
|
||
ssh_read_key_public_from_blob (unsigned char *blob, size_t blob_size,
|
||
gcry_sexp_t *key_public,
|
||
ssh_key_type_spec_t *key_spec)
|
||
{
|
||
gpg_error_t err;
|
||
estream_t blob_stream;
|
||
|
||
blob_stream = es_fopenmem (0, "r+b");
|
||
if (!blob_stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
err = stream_write_data (blob_stream, blob, blob_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = es_fseek (blob_stream, 0, SEEK_SET);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_receive_key (blob_stream, key_public, 0, 0, key_spec);
|
||
|
||
out:
|
||
es_fclose (blob_stream);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* This function calculates the key grip for the key contained in the
|
||
S-Expression KEY and writes it to BUFFER, which must be large
|
||
enough to hold it. Returns usual error code. */
|
||
static gpg_error_t
|
||
ssh_key_grip (gcry_sexp_t key, unsigned char *buffer)
|
||
{
|
||
if (!gcry_pk_get_keygrip (key, buffer))
|
||
{
|
||
gpg_error_t err = gcry_pk_testkey (key);
|
||
return err? err : gpg_error (GPG_ERR_INTERNAL);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Check whether a key of KEYGRIP on smartcard is available and
|
||
whether it has a usable key. Store a copy of that key at R_PK and
|
||
return 0. If no key is available store NULL at R_PK and return an
|
||
error code. If CARDSN is not NULL, a string with the serial number
|
||
of the card will be a malloced and stored there. */
|
||
static gpg_error_t
|
||
card_key_available (ctrl_t ctrl, const struct card_key_info_s *keyinfo,
|
||
gcry_sexp_t *r_pk, char **cardsn)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned char *pkbuf;
|
||
size_t pkbuflen;
|
||
gcry_sexp_t s_pk;
|
||
unsigned char grip[20];
|
||
|
||
*r_pk = NULL;
|
||
if (cardsn)
|
||
*cardsn = NULL;
|
||
|
||
/* Read the public key. */
|
||
err = agent_card_readkey (ctrl, keyinfo->keygrip, &pkbuf, NULL);
|
||
if (err)
|
||
{
|
||
if (opt.verbose)
|
||
log_info (_("no suitable card key found: %s\n"), gpg_strerror (err));
|
||
return err;
|
||
}
|
||
|
||
pkbuflen = gcry_sexp_canon_len (pkbuf, 0, NULL, NULL);
|
||
err = gcry_sexp_sscan (&s_pk, NULL, (char*)pkbuf, pkbuflen);
|
||
if (err)
|
||
{
|
||
log_error ("failed to build S-Exp from received card key: %s\n",
|
||
gpg_strerror (err));
|
||
xfree (pkbuf);
|
||
return err;
|
||
}
|
||
|
||
hex2bin (keyinfo->keygrip, grip, sizeof (grip));
|
||
if (!ctrl->ephemeral_mode && agent_key_available (ctrl, grip) )
|
||
{
|
||
char *dispserialno;
|
||
|
||
/* (Shadow)-key is not available in our key storage. */
|
||
agent_card_getattr (ctrl, "$DISPSERIALNO", &dispserialno,
|
||
keyinfo->keygrip);
|
||
err = agent_write_shadow_key (ctrl, grip, keyinfo->serialno,
|
||
keyinfo->idstr, pkbuf, 0, dispserialno);
|
||
xfree (dispserialno);
|
||
if (err)
|
||
{
|
||
xfree (pkbuf);
|
||
gcry_sexp_release (s_pk);
|
||
return err;
|
||
}
|
||
}
|
||
|
||
if (cardsn)
|
||
{
|
||
char *dispsn;
|
||
char *p;
|
||
|
||
/* If the card handler is able to return a short serialnumber,
|
||
use that one, else use the complete serialno. */
|
||
if (!agent_card_getattr (ctrl, "$DISPSERIALNO", &dispsn,
|
||
keyinfo->keygrip))
|
||
{
|
||
*cardsn = xtryasprintf ("cardno:%s", dispsn);
|
||
xfree (dispsn);
|
||
}
|
||
else
|
||
*cardsn = xtryasprintf ("cardno:%s", keyinfo->serialno);
|
||
if (!*cardsn)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
xfree (pkbuf);
|
||
gcry_sexp_release (s_pk);
|
||
return err;
|
||
}
|
||
/* Let's avoid blanks in the comment. */
|
||
for (p=*cardsn; *p; p++)
|
||
if (spacep (p))
|
||
*p = '_';
|
||
}
|
||
|
||
xfree (pkbuf);
|
||
*r_pk = s_pk;
|
||
return 0;
|
||
}
|
||
|
||
static struct card_key_info_s *
|
||
get_ssh_keyinfo_on_cards (ctrl_t ctrl)
|
||
{
|
||
struct card_key_info_s *keyinfo_on_cards = NULL;
|
||
gpg_error_t err;
|
||
char *serialno;
|
||
|
||
if (opt.disable_daemon[DAEMON_SCD])
|
||
return NULL;
|
||
|
||
/* Scan for new device(s). */
|
||
err = agent_card_serialno (ctrl, &serialno, NULL);
|
||
if (err)
|
||
{
|
||
if (opt.verbose)
|
||
log_info (_("error getting list of cards: %s\n"),
|
||
gpg_strerror (err));
|
||
return NULL;
|
||
}
|
||
|
||
xfree (serialno);
|
||
|
||
err = agent_card_keyinfo (ctrl, NULL, GCRY_PK_USAGE_AUTH, &keyinfo_on_cards);
|
||
if (err)
|
||
return NULL;
|
||
|
||
return keyinfo_on_cards;
|
||
}
|
||
|
||
|
||
/* Append (KEY,CARDSN,LNR,ORDER) to ARRAY. The array must initially
|
||
* be passed as a cleared struct. ARRAY takes ownership of KEY and
|
||
* CARDSN. */
|
||
static gpg_error_t
|
||
add_to_key_array (struct key_collection_s *array, gcry_sexp_t key,
|
||
char *cardsn, int order)
|
||
{
|
||
if (array->nitems == array->allocated)
|
||
{
|
||
struct key_collection_item_s *newitems;
|
||
size_t newsize = ((array->allocated + 63)/64 + 1) * 64;
|
||
|
||
newitems = xtryreallocarray (array->items, array->allocated, newsize+1,
|
||
sizeof *newitems);
|
||
if (!newitems)
|
||
return gpg_error_from_syserror ();
|
||
array->allocated = newsize;
|
||
array->items = newitems;
|
||
}
|
||
array->items[array->nitems].key = key;
|
||
array->items[array->nitems].cardsn = cardsn;
|
||
array->items[array->nitems].order = order;
|
||
array->nitems++;
|
||
return 0;
|
||
}
|
||
|
||
/* Release the content of ARRAY. */
|
||
static void
|
||
free_key_array (struct key_collection_s *array)
|
||
{
|
||
if (array && array->items)
|
||
{
|
||
unsigned int n;
|
||
|
||
for (n = 0; n < array->nitems; n++)
|
||
{
|
||
gcry_sexp_release (array->items[n].key);
|
||
xfree (array->items[n].cardsn);
|
||
}
|
||
xfree (array->items);
|
||
}
|
||
}
|
||
|
||
|
||
/* Helper for the qsort in ssh_send_available_keys. */
|
||
static int
|
||
compare_key_collection_items (const void *arg_a, const void *arg_b)
|
||
{
|
||
const struct key_collection_item_s *a
|
||
= (const struct key_collection_item_s *)arg_a;
|
||
const struct key_collection_item_s *b
|
||
= (const struct key_collection_item_s *)arg_b;
|
||
int res;
|
||
|
||
res = a->order - b->order;
|
||
/* If we are comparing two cards we sort by serial number. */
|
||
if (!res && a->order == 1)
|
||
res = strcmp (a->cardsn?a->cardsn:"", b->cardsn?b->cardsn:"");
|
||
return res;
|
||
}
|
||
|
||
|
||
static gpg_error_t
|
||
ssh_send_available_keys (ctrl_t ctrl, estream_t key_blobs, u32 *r_key_counter)
|
||
{
|
||
gpg_error_t err;
|
||
char *dirname;
|
||
gnupg_dir_t dir = NULL;
|
||
gnupg_dirent_t dir_entry;
|
||
char hexgrip[41];
|
||
ssh_control_file_t cf = NULL;
|
||
struct card_key_info_s *keyinfo_on_cards, *l;
|
||
char *cardsn;
|
||
gcry_sexp_t key_public = NULL;
|
||
int count;
|
||
struct key_collection_s keyarray = { NULL };
|
||
|
||
err = open_control_file (&cf, 0);
|
||
if (err)
|
||
return err;
|
||
|
||
/* First, get information keys available on cards on-line. */
|
||
keyinfo_on_cards = get_ssh_keyinfo_on_cards (ctrl);
|
||
|
||
/* Look at all the registered and non-disabled keys, in sshcontrol. */
|
||
/* And, look at all keys with "Use-for-ssh:" flag. */
|
||
dirname = make_filename_try (gnupg_homedir (),
|
||
GNUPG_PRIVATE_KEYS_DIR, NULL);
|
||
if (!dirname)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
agent_card_free_keyinfo (keyinfo_on_cards);
|
||
return err;
|
||
}
|
||
dir = gnupg_opendir (dirname);
|
||
if (!dir)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
xfree (dirname);
|
||
agent_card_free_keyinfo (keyinfo_on_cards);
|
||
return err;
|
||
}
|
||
xfree (dirname);
|
||
|
||
while ( (dir_entry = gnupg_readdir (dir)) )
|
||
{
|
||
struct card_key_info_s *l_prev = NULL;
|
||
int disabled, is_ssh, lnr, order;
|
||
unsigned char grip[20];
|
||
|
||
cardsn = NULL;
|
||
if (strlen (dir_entry->d_name) != 44
|
||
|| strcmp (dir_entry->d_name + 40, ".key"))
|
||
continue;
|
||
strncpy (hexgrip, dir_entry->d_name, 40);
|
||
hexgrip[40] = 0;
|
||
|
||
if ( hex2bin (hexgrip, grip, 20) < 0 )
|
||
continue; /* Bad hex string. */
|
||
|
||
/* Check if it's a key on card. */
|
||
for (l = keyinfo_on_cards; l; l = l->next)
|
||
if (!memcmp (l->keygrip, hexgrip, 40))
|
||
break;
|
||
else
|
||
l_prev = l;
|
||
|
||
/* Check if it's listed in "ssh_control" file. */
|
||
disabled = is_ssh = 0;
|
||
err = search_control_file (cf, hexgrip, &disabled, NULL, NULL, &lnr);
|
||
if (!err)
|
||
{
|
||
if (!disabled)
|
||
{
|
||
is_ssh = 1;
|
||
}
|
||
}
|
||
else if (gpg_err_code (err) != GPG_ERR_EOF)
|
||
break;
|
||
|
||
/* Clamp LNR value and set the ordinal.
|
||
* Current use of ordinals:
|
||
* 1..999 - low value Use-for-ssh.
|
||
* 1000..99999 - inserted cards (right now only 1000)
|
||
* 100000..199999 - listed in sshcontrol
|
||
* 200000..299999 - order taken from Use-for-ssh
|
||
*/
|
||
if (is_ssh)
|
||
{
|
||
if (lnr < 1)
|
||
lnr = 0;
|
||
else if (lnr > 99999)
|
||
lnr = 99999;
|
||
order = lnr + 100000;
|
||
}
|
||
|
||
if (l)
|
||
{
|
||
err = card_key_available (ctrl, l, &key_public, &cardsn);
|
||
/* Remove the entry from the list of KEYINFO_ON_CARD */
|
||
if (l_prev)
|
||
l_prev->next = l->next;
|
||
else
|
||
keyinfo_on_cards = l->next;
|
||
xfree (l->serialno);
|
||
xfree (l->idstr);
|
||
xfree (l->usage);
|
||
xfree (l);
|
||
l = NULL;
|
||
/* If we want to allow that the user to change the sorting
|
||
* order of card keys (which are sorted by their s/n), we
|
||
* would need to get the use-for-ssh: value from the stub
|
||
* file and set an appropriate ordinal. */
|
||
order = 1000;
|
||
}
|
||
else if (is_ssh)
|
||
err = agent_public_key_from_file (ctrl, grip, &key_public);
|
||
else /* Examine the file if it's suitable for SSH. */
|
||
{
|
||
err = agent_ssh_key_from_file (ctrl, grip, &key_public, &order);
|
||
if (err)
|
||
order = 0;
|
||
else if (order < 0)
|
||
{
|
||
order = -order;
|
||
if (order > 999)
|
||
order = 999;
|
||
}
|
||
else if (order > 99999)
|
||
order = 299999;
|
||
else
|
||
order += 200000;
|
||
}
|
||
if (err)
|
||
{
|
||
/* Clear ERR, skipping the key in question. */
|
||
err = 0;
|
||
continue;
|
||
}
|
||
|
||
err = add_to_key_array (&keyarray, key_public, cardsn, order);
|
||
if (err)
|
||
{
|
||
gcry_sexp_release (key_public);
|
||
xfree (cardsn);
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
gnupg_closedir (dir);
|
||
ssh_close_control_file (cf);
|
||
|
||
/* Lastly, handle remaining keys which don't have the stub files. */
|
||
for (l = keyinfo_on_cards, count=0; l; l = l->next, count++)
|
||
{
|
||
cardsn = NULL;
|
||
if (card_key_available (ctrl, l, &key_public, &cardsn))
|
||
continue;
|
||
|
||
err = add_to_key_array (&keyarray, key_public, cardsn, 300000+count);
|
||
if (err)
|
||
{
|
||
gcry_sexp_release (key_public);
|
||
xfree (cardsn);
|
||
goto leave;
|
||
}
|
||
}
|
||
|
||
/* Sort the array. */
|
||
qsort (keyarray.items, keyarray.nitems, sizeof *keyarray.items,
|
||
compare_key_collection_items);
|
||
if (opt.debug)
|
||
for (count=0; count < keyarray.nitems; count++)
|
||
log_debug ("sshkeys[%d]: order=%d, pubkey=%p sn=%s\n",
|
||
count, keyarray.items[count].order,
|
||
keyarray.items[count].key, keyarray.items[count].cardsn);
|
||
|
||
/* And print the keys. */
|
||
for (count=0; count < keyarray.nitems; count++)
|
||
{
|
||
err = ssh_send_key_public (key_blobs, keyarray.items[count].key,
|
||
keyarray.items[count].cardsn);
|
||
if (err)
|
||
{
|
||
if (opt.debug)
|
||
gcry_log_debugsxp ("pubkey", keyarray.items[count].key);
|
||
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_CURVE
|
||
|| gpg_err_code (err) == GPG_ERR_INV_CURVE)
|
||
{
|
||
/* For example a Brainpool curve or a curve we don't
|
||
* support at all but a smartcard lists that curve.
|
||
* We ignore them. */
|
||
}
|
||
else
|
||
goto leave;
|
||
}
|
||
}
|
||
*r_key_counter = count;
|
||
|
||
leave:
|
||
agent_card_free_keyinfo (keyinfo_on_cards);
|
||
free_key_array (&keyarray);
|
||
return err;
|
||
}
|
||
|
||
|
||
/*
|
||
|
||
Request handler. Each handler is provided with a CTRL context, a
|
||
REQUEST object and a RESPONSE object. The actual request is to be
|
||
read from REQUEST, the response needs to be written to RESPONSE.
|
||
|
||
*/
|
||
|
||
|
||
/* Handler for the "request_identities" command. */
|
||
static gpg_error_t
|
||
ssh_handler_request_identities (ctrl_t ctrl,
|
||
estream_t request, estream_t response)
|
||
{
|
||
u32 key_counter;
|
||
estream_t key_blobs;
|
||
gpg_error_t err;
|
||
int ret;
|
||
gpg_error_t ret_err;
|
||
|
||
(void)request;
|
||
|
||
/* Prepare buffer stream. */
|
||
|
||
key_counter = 0;
|
||
|
||
key_blobs = es_fopenmem (0, "r+b");
|
||
if (! key_blobs)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
err = ssh_send_available_keys (ctrl, key_blobs, &key_counter);
|
||
if (!err)
|
||
{
|
||
ret = es_fseek (key_blobs, 0, SEEK_SET);
|
||
if (ret)
|
||
err = gpg_error_from_syserror ();
|
||
}
|
||
|
||
out:
|
||
/* Send response. */
|
||
|
||
if (!err)
|
||
{
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_IDENTITIES_ANSWER);
|
||
if (!ret_err)
|
||
ret_err = stream_write_uint32 (response, key_counter);
|
||
if (!ret_err)
|
||
ret_err = stream_copy (response, key_blobs);
|
||
}
|
||
else
|
||
{
|
||
log_error ("ssh request identities failed: %s <%s>\n",
|
||
gpg_strerror (err), gpg_strsource (err));
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
}
|
||
|
||
es_fclose (key_blobs);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
|
||
/* This function hashes the data contained in DATA of size DATA_N
|
||
according to the message digest algorithm specified by MD_ALGORITHM
|
||
and writes the message digest to HASH, which needs to large enough
|
||
for the digest. */
|
||
static gpg_error_t
|
||
data_hash (unsigned char *data, size_t data_n,
|
||
int md_algorithm, unsigned char *hash)
|
||
{
|
||
gcry_md_hash_buffer (md_algorithm, hash, data, data_n);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* This function signs the data described by CTRL. If HASH is not
|
||
NULL, (HASH,HASHLEN) overrides the hash stored in CTRL. This is to
|
||
allow the use of signature algorithms that implement the hashing
|
||
internally (e.g. Ed25519). On success the created signature is
|
||
stored in ssh format at R_SIG and it's size at R_SIGLEN; the caller
|
||
must use es_free to release this memory. */
|
||
static gpg_error_t
|
||
data_sign (ctrl_t ctrl, ssh_key_type_spec_t *spec,
|
||
const void *hash, size_t hashlen,
|
||
unsigned char **r_sig, size_t *r_siglen)
|
||
{
|
||
gpg_error_t err;
|
||
gcry_sexp_t signature_sexp = NULL;
|
||
estream_t stream = NULL;
|
||
void *blob = NULL;
|
||
size_t bloblen;
|
||
char hexgrip[40+1];
|
||
|
||
*r_sig = NULL;
|
||
*r_siglen = 0;
|
||
|
||
/* Quick check to see whether we have a valid keygrip and convert it
|
||
to hex. */
|
||
if (!ctrl->have_keygrip)
|
||
{
|
||
err = gpg_error (GPG_ERR_NO_SECKEY);
|
||
goto out;
|
||
}
|
||
bin2hex (ctrl->keygrip, 20, hexgrip);
|
||
|
||
/* Ask for confirmation if needed. */
|
||
if (confirm_flag_from_sshcontrol (hexgrip))
|
||
{
|
||
gcry_sexp_t key;
|
||
char *fpr, *prompt;
|
||
char *comment = NULL;
|
||
|
||
err = agent_raw_key_from_file (ctrl, ctrl->keygrip, &key, NULL);
|
||
if (err)
|
||
goto out;
|
||
err = ssh_get_fingerprint_string (key, opt.ssh_fingerprint_digest, &fpr);
|
||
if (!err)
|
||
{
|
||
gcry_sexp_t tmpsxp = gcry_sexp_find_token (key, "comment", 0);
|
||
if (tmpsxp)
|
||
comment = gcry_sexp_nth_string (tmpsxp, 1);
|
||
gcry_sexp_release (tmpsxp);
|
||
}
|
||
gcry_sexp_release (key);
|
||
if (err)
|
||
goto out;
|
||
prompt = xtryasprintf (L_("An ssh process requested the use of key%%0A"
|
||
" %s%%0A"
|
||
" (%s)%%0A"
|
||
"Do you want to allow this?"),
|
||
fpr, comment? comment:"");
|
||
xfree (fpr);
|
||
gcry_free (comment);
|
||
err = agent_get_confirmation (ctrl, prompt, L_("Allow"), L_("Deny"), 0);
|
||
xfree (prompt);
|
||
if (err)
|
||
goto out;
|
||
}
|
||
|
||
/* Create signature. */
|
||
ctrl->use_auth_call = 1;
|
||
err = agent_pksign_do (ctrl, NULL,
|
||
L_("Please enter the passphrase "
|
||
"for the ssh key%%0A %F%%0A (%c)"),
|
||
&signature_sexp,
|
||
CACHE_MODE_SSH, ttl_from_sshcontrol,
|
||
hash, hashlen);
|
||
ctrl->use_auth_call = 0;
|
||
if (err)
|
||
goto out;
|
||
|
||
stream = es_fopenmem (0, "r+b");
|
||
if (!stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
err = stream_write_cstring (stream, spec->ssh_identifier);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = spec->signature_encoder (spec, stream, signature_sexp);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = es_fclose_snatch (stream, &blob, &bloblen);
|
||
if (err)
|
||
goto out;
|
||
stream = NULL;
|
||
|
||
*r_sig = blob; blob = NULL;
|
||
*r_siglen = bloblen;
|
||
|
||
out:
|
||
xfree (blob);
|
||
es_fclose (stream);
|
||
gcry_sexp_release (signature_sexp);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Handler for the "sign_request" command. */
|
||
static gpg_error_t
|
||
ssh_handler_sign_request (ctrl_t ctrl, estream_t request, estream_t response)
|
||
{
|
||
gcry_sexp_t key = NULL;
|
||
ssh_key_type_spec_t spec;
|
||
unsigned char hash[MAX_DIGEST_LEN];
|
||
unsigned int hash_n;
|
||
unsigned char key_grip[20];
|
||
unsigned char *key_blob = NULL;
|
||
u32 key_blob_size;
|
||
unsigned char *data = NULL;
|
||
unsigned char *sig = NULL;
|
||
size_t sig_n;
|
||
u32 data_size;
|
||
gpg_error_t err;
|
||
gpg_error_t ret_err;
|
||
int hash_algo;
|
||
|
||
/* Receive key. */
|
||
|
||
err = stream_read_string (request, 0, &key_blob, &key_blob_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_read_key_public_from_blob (key_blob, key_blob_size, &key, &spec);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Receive data to sign. */
|
||
err = stream_read_string (request, 0, &data, &data_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Flag processing. */
|
||
{
|
||
u32 flags;
|
||
|
||
err = stream_read_uint32 (request, &flags);
|
||
if (err)
|
||
goto out;
|
||
|
||
if (spec.algo == GCRY_PK_RSA)
|
||
{
|
||
if ((flags & SSH_AGENT_RSA_SHA2_512))
|
||
{
|
||
flags &= ~SSH_AGENT_RSA_SHA2_512;
|
||
spec.ssh_identifier = "rsa-sha2-512";
|
||
spec.hash_algo = GCRY_MD_SHA512;
|
||
}
|
||
if ((flags & SSH_AGENT_RSA_SHA2_256))
|
||
{
|
||
/* Note: We prefer SHA256 over SHA512. */
|
||
flags &= ~SSH_AGENT_RSA_SHA2_256;
|
||
spec.ssh_identifier = "rsa-sha2-256";
|
||
spec.hash_algo = GCRY_MD_SHA256;
|
||
}
|
||
}
|
||
|
||
/* Some flag is present that we do not know about. Note that
|
||
* processed or known flags have been cleared at this point. */
|
||
if (flags)
|
||
{
|
||
err = gpg_error (GPG_ERR_UNKNOWN_OPTION);
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
hash_algo = spec.hash_algo;
|
||
if (!hash_algo)
|
||
hash_algo = GCRY_MD_SHA1; /* Use the default. */
|
||
ctrl->digest.algo = hash_algo;
|
||
xfree (ctrl->digest.data);
|
||
ctrl->digest.data = NULL;
|
||
ctrl->digest.is_pss = 0;
|
||
if ((spec.flags & SPEC_FLAG_USE_PKCS1V2))
|
||
ctrl->digest.raw_value = 0;
|
||
else
|
||
ctrl->digest.raw_value = 1;
|
||
|
||
/* Calculate key grip. */
|
||
err = ssh_key_grip (key, key_grip);
|
||
if (err)
|
||
goto out;
|
||
ctrl->have_keygrip = 1;
|
||
memcpy (ctrl->keygrip, key_grip, 20);
|
||
|
||
/* Hash data unless we use EdDSA. */
|
||
if ((spec.flags & SPEC_FLAG_IS_EdDSA))
|
||
{
|
||
ctrl->digest.valuelen = 0;
|
||
}
|
||
else
|
||
{
|
||
hash_n = gcry_md_get_algo_dlen (hash_algo);
|
||
if (!hash_n)
|
||
{
|
||
err = gpg_error (GPG_ERR_INTERNAL);
|
||
goto out;
|
||
}
|
||
err = data_hash (data, data_size, hash_algo, hash);
|
||
if (err)
|
||
goto out;
|
||
memcpy (ctrl->digest.value, hash, hash_n);
|
||
ctrl->digest.valuelen = hash_n;
|
||
}
|
||
|
||
/* Sign data. */
|
||
if ((spec.flags & SPEC_FLAG_IS_EdDSA))
|
||
err = data_sign (ctrl, &spec, data, data_size, &sig, &sig_n);
|
||
else
|
||
err = data_sign (ctrl, &spec, NULL, 0, &sig, &sig_n);
|
||
|
||
out:
|
||
/* Done. */
|
||
if (!err)
|
||
{
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SIGN_RESPONSE);
|
||
if (ret_err)
|
||
goto leave;
|
||
ret_err = stream_write_string (response, sig, sig_n);
|
||
if (ret_err)
|
||
goto leave;
|
||
}
|
||
else
|
||
{
|
||
log_error ("ssh sign request failed: %s <%s>\n",
|
||
gpg_strerror (err), gpg_strsource (err));
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
if (ret_err)
|
||
goto leave;
|
||
}
|
||
|
||
leave:
|
||
|
||
gcry_sexp_release (key);
|
||
xfree (key_blob);
|
||
xfree (data);
|
||
es_free (sig);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
|
||
/* This function extracts the comment contained in the key
|
||
s-expression KEY and stores a copy in COMMENT. Returns usual error
|
||
code. */
|
||
static gpg_error_t
|
||
ssh_key_extract_comment (gcry_sexp_t key, char **r_comment)
|
||
{
|
||
gcry_sexp_t comment_list;
|
||
|
||
*r_comment = NULL;
|
||
|
||
comment_list = gcry_sexp_find_token (key, "comment", 0);
|
||
if (!comment_list)
|
||
return gpg_error (GPG_ERR_INV_SEXP);
|
||
|
||
*r_comment = gcry_sexp_nth_string (comment_list, 1);
|
||
gcry_sexp_release (comment_list);
|
||
if (!*r_comment)
|
||
return gpg_error (GPG_ERR_INV_SEXP);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* This function converts the key contained in the S-Expression KEY
|
||
into a buffer, which is protected by the passphrase PASSPHRASE.
|
||
If PASSPHRASE is the empty passphrase, the key is not protected.
|
||
Returns usual error code. */
|
||
static gpg_error_t
|
||
ssh_key_to_protected_buffer (gcry_sexp_t key, const char *passphrase,
|
||
unsigned char **buffer, size_t *buffer_n)
|
||
{
|
||
unsigned char *buffer_new;
|
||
unsigned int buffer_new_n;
|
||
gpg_error_t err;
|
||
|
||
buffer_new_n = gcry_sexp_sprint (key, GCRYSEXP_FMT_CANON, NULL, 0);
|
||
buffer_new = xtrymalloc_secure (buffer_new_n);
|
||
if (! buffer_new)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
buffer_new_n = gcry_sexp_sprint (key, GCRYSEXP_FMT_CANON,
|
||
buffer_new, buffer_new_n);
|
||
|
||
if (*passphrase)
|
||
err = agent_protect (buffer_new, passphrase, buffer, buffer_n, 0);
|
||
else
|
||
{
|
||
/* The key derivation function does not support zero length
|
||
* strings. Store key unprotected if the user wishes so. */
|
||
*buffer = buffer_new;
|
||
*buffer_n = buffer_new_n;
|
||
buffer_new = NULL;
|
||
err = 0;
|
||
}
|
||
|
||
out:
|
||
|
||
xfree (buffer_new);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
/* Callback function to compare the first entered PIN with the one
|
||
currently being entered. */
|
||
static gpg_error_t
|
||
reenter_compare_cb (struct pin_entry_info_s *pi)
|
||
{
|
||
const char *pin1 = pi->check_cb_arg;
|
||
|
||
if (!strcmp (pin1, pi->pin))
|
||
return 0; /* okay */
|
||
return gpg_error (GPG_ERR_BAD_PASSPHRASE);
|
||
}
|
||
|
||
|
||
/* Store the ssh KEY into our local key storage and protect it after
|
||
asking for a passphrase. Cache that passphrase. TTL is the
|
||
maximum caching time for that key. If the key already exists in
|
||
our key storage, don't do anything. When entering a key also add
|
||
an entry to the sshcontrol file. */
|
||
static gpg_error_t
|
||
ssh_identity_register (ctrl_t ctrl, ssh_key_type_spec_t *spec,
|
||
gcry_sexp_t key, int ttl, int confirm)
|
||
{
|
||
gpg_error_t err;
|
||
unsigned char key_grip_raw[20];
|
||
char key_grip[41];
|
||
unsigned char *buffer = NULL;
|
||
size_t buffer_n;
|
||
char *description = NULL;
|
||
const char *description2 = L_("Please re-enter this passphrase");
|
||
char *comment = NULL;
|
||
char *key_fpr = NULL;
|
||
const char *initial_errtext = NULL;
|
||
struct pin_entry_info_s *pi = NULL;
|
||
struct pin_entry_info_s *pi2 = NULL;
|
||
|
||
err = ssh_key_grip (key, key_grip_raw);
|
||
if (err)
|
||
goto out;
|
||
|
||
bin2hex (key_grip_raw, 20, key_grip);
|
||
|
||
err = ssh_get_fingerprint_string (key, opt.ssh_fingerprint_digest, &key_fpr);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Check whether the key is already in our key storage. Don't do
|
||
anything then besides (re-)adding it to sshcontrol. */
|
||
if ( !agent_key_available (ctrl, key_grip_raw) )
|
||
goto key_exists; /* Yes, key is available. */
|
||
|
||
err = ssh_key_extract_comment (key, &comment);
|
||
if (err)
|
||
goto out;
|
||
|
||
if ( asprintf (&description,
|
||
L_("Please enter a passphrase to protect"
|
||
" the received secret key%%0A"
|
||
" %s%%0A"
|
||
" %s%%0A"
|
||
"within gpg-agent's key storage"),
|
||
key_fpr, comment ? comment : "") < 0)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
pi = gcry_calloc_secure (1, sizeof (*pi) + MAX_PASSPHRASE_LEN + 1);
|
||
if (!pi)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
pi2 = gcry_calloc_secure (1, sizeof (*pi2) + MAX_PASSPHRASE_LEN + 1);
|
||
if (!pi2)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
pi->max_length = MAX_PASSPHRASE_LEN + 1;
|
||
pi->max_tries = 1;
|
||
pi->with_repeat = 1;
|
||
pi2->max_length = MAX_PASSPHRASE_LEN + 1;
|
||
pi2->max_tries = 1;
|
||
pi2->check_cb = reenter_compare_cb;
|
||
pi2->check_cb_arg = pi->pin;
|
||
|
||
next_try:
|
||
err = agent_askpin (ctrl, description, NULL, initial_errtext, pi, NULL, 0);
|
||
initial_errtext = NULL;
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Unless the passphrase is empty or the pinentry told us that
|
||
it already did the repetition check, ask to confirm it. */
|
||
if (*pi->pin && !pi->repeat_okay)
|
||
{
|
||
err = agent_askpin (ctrl, description2, NULL, NULL, pi2, NULL, 0);
|
||
if (gpg_err_code (err) == GPG_ERR_BAD_PASSPHRASE)
|
||
{ /* The re-entered one did not match and the user did not
|
||
hit cancel. */
|
||
initial_errtext = L_("does not match - try again");
|
||
goto next_try;
|
||
}
|
||
}
|
||
|
||
err = ssh_key_to_protected_buffer (key, pi->pin, &buffer, &buffer_n);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Store this key to our key storage. We do not store a creation
|
||
* timestamp because we simply do not know. */
|
||
err = agent_write_private_key (ctrl, key_grip_raw, buffer, buffer_n, 0,
|
||
NULL, NULL, NULL, 0);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* Cache this passphrase. */
|
||
err = agent_put_cache (ctrl, key_grip, CACHE_MODE_SSH, pi->pin, ttl);
|
||
if (err)
|
||
goto out;
|
||
|
||
key_exists:
|
||
/* And add an entry to the sshcontrol file. */
|
||
err = add_control_entry (ctrl, spec, key_grip, key, ttl, confirm);
|
||
|
||
|
||
out:
|
||
if (pi2 && pi2->max_length)
|
||
wipememory (pi2->pin, pi2->max_length);
|
||
xfree (pi2);
|
||
if (pi && pi->max_length)
|
||
wipememory (pi->pin, pi->max_length);
|
||
xfree (pi);
|
||
xfree (buffer);
|
||
xfree (comment);
|
||
xfree (key_fpr);
|
||
xfree (description);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
/* This function removes the key contained in the S-Expression KEY
|
||
from the local key storage, in case it exists there. Returns usual
|
||
error code. FIXME: this function is a stub. */
|
||
static gpg_error_t
|
||
ssh_identity_drop (gcry_sexp_t key)
|
||
{
|
||
unsigned char key_grip[21] = { 0 };
|
||
gpg_error_t err;
|
||
|
||
err = ssh_key_grip (key, key_grip);
|
||
if (err)
|
||
goto out;
|
||
|
||
key_grip[sizeof (key_grip) - 1] = 0;
|
||
|
||
/* FIXME: What to do here - forgetting the passphrase or deleting
|
||
the key from key cache? */
|
||
|
||
out:
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Handler for the "add_identity" command. */
|
||
static gpg_error_t
|
||
ssh_handler_add_identity (ctrl_t ctrl, estream_t request, estream_t response)
|
||
{
|
||
gpg_error_t ret_err;
|
||
ssh_key_type_spec_t spec;
|
||
gpg_error_t err;
|
||
gcry_sexp_t key;
|
||
unsigned char b;
|
||
int confirm;
|
||
int ttl;
|
||
|
||
confirm = 0;
|
||
key = NULL;
|
||
ttl = 0;
|
||
|
||
/* FIXME? */
|
||
err = ssh_receive_key (request, &key, 1, 1, &spec);
|
||
if (err)
|
||
goto out;
|
||
|
||
while (1)
|
||
{
|
||
err = stream_read_byte (request, &b);
|
||
if (err)
|
||
{
|
||
if (gpg_err_code (err) == GPG_ERR_EOF)
|
||
err = 0;
|
||
break;
|
||
}
|
||
|
||
switch (b)
|
||
{
|
||
case SSH_OPT_CONSTRAIN_LIFETIME:
|
||
{
|
||
u32 n = 0;
|
||
|
||
err = stream_read_uint32 (request, &n);
|
||
if (! err)
|
||
ttl = n;
|
||
break;
|
||
}
|
||
|
||
case SSH_OPT_CONSTRAIN_CONFIRM:
|
||
{
|
||
confirm = 1;
|
||
break;
|
||
}
|
||
|
||
case SSH_OPT_CONSTRAIN_MAXSIGN:
|
||
case SSH_OPT_CONSTRAIN_EXTENSION:
|
||
/* Not yet implemented. */
|
||
break;
|
||
|
||
default:
|
||
/* FIXME: log/bad? */
|
||
break;
|
||
}
|
||
}
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_identity_register (ctrl, &spec, key, ttl, confirm);
|
||
|
||
out:
|
||
|
||
gcry_sexp_release (key);
|
||
|
||
if (! err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
/* Handler for the "remove_identity" command. */
|
||
static gpg_error_t
|
||
ssh_handler_remove_identity (ctrl_t ctrl,
|
||
estream_t request, estream_t response)
|
||
{
|
||
unsigned char *key_blob;
|
||
u32 key_blob_size;
|
||
gcry_sexp_t key;
|
||
gpg_error_t ret_err;
|
||
gpg_error_t err;
|
||
|
||
(void)ctrl;
|
||
|
||
/* Receive key. */
|
||
|
||
key_blob = NULL;
|
||
key = NULL;
|
||
|
||
err = stream_read_string (request, 0, &key_blob, &key_blob_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_read_key_public_from_blob (key_blob, key_blob_size, &key, NULL);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = ssh_identity_drop (key);
|
||
|
||
out:
|
||
|
||
xfree (key_blob);
|
||
gcry_sexp_release (key);
|
||
|
||
if (! err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
/* FIXME: stub function. Actually useful? */
|
||
static gpg_error_t
|
||
ssh_identities_remove_all (void)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
err = 0;
|
||
|
||
/* FIXME: shall we remove _all_ cache entries or only those
|
||
registered through the ssh-agent protocol? */
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Handler for the "remove_all_identities" command. */
|
||
static gpg_error_t
|
||
ssh_handler_remove_all_identities (ctrl_t ctrl,
|
||
estream_t request, estream_t response)
|
||
{
|
||
gpg_error_t ret_err;
|
||
gpg_error_t err;
|
||
|
||
(void)ctrl;
|
||
(void)request;
|
||
|
||
err = ssh_identities_remove_all ();
|
||
|
||
if (! err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
/* Lock agent? FIXME: stub function. */
|
||
static gpg_error_t
|
||
ssh_lock (void)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
/* FIXME */
|
||
log_error ("ssh-agent's lock command is not implemented\n");
|
||
err = 0;
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Unock agent? FIXME: stub function. */
|
||
static gpg_error_t
|
||
ssh_unlock (void)
|
||
{
|
||
gpg_error_t err;
|
||
|
||
log_error ("ssh-agent's unlock command is not implemented\n");
|
||
err = 0;
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Handler for the "lock" command. */
|
||
static gpg_error_t
|
||
ssh_handler_lock (ctrl_t ctrl, estream_t request, estream_t response)
|
||
{
|
||
gpg_error_t ret_err;
|
||
gpg_error_t err;
|
||
|
||
(void)ctrl;
|
||
(void)request;
|
||
|
||
err = ssh_lock ();
|
||
|
||
if (! err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
/* Handler for the "unlock" command. */
|
||
static gpg_error_t
|
||
ssh_handler_unlock (ctrl_t ctrl, estream_t request, estream_t response)
|
||
{
|
||
gpg_error_t ret_err;
|
||
gpg_error_t err;
|
||
|
||
(void)ctrl;
|
||
(void)request;
|
||
|
||
err = ssh_unlock ();
|
||
|
||
if (! err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
|
||
return ret_err;
|
||
}
|
||
|
||
/* Handler for the "extension" command. */
|
||
static gpg_error_t
|
||
ssh_handler_extension (ctrl_t ctrl, estream_t request, estream_t response)
|
||
{
|
||
gpg_error_t ret_err;
|
||
gpg_error_t err;
|
||
char *exttype = NULL;
|
||
char *name = NULL;
|
||
char *value = NULL;
|
||
|
||
err = stream_read_cstring (request, &exttype);
|
||
if (err)
|
||
goto leave;
|
||
|
||
if (opt.verbose)
|
||
log_info ("ssh-agent extension '%s' received\n", exttype);
|
||
if (!strcmp (exttype, "ssh-env@gnupg.org"))
|
||
{
|
||
for (;;)
|
||
{
|
||
xfree (name); name = NULL;
|
||
err = stream_read_cstring (request, &name);
|
||
if (gpg_err_code (err) == GPG_ERR_EOF)
|
||
break; /* ready. */
|
||
if (err)
|
||
{
|
||
if (opt.verbose)
|
||
log_error ("error reading ssh-agent env name\n");
|
||
goto leave;
|
||
}
|
||
xfree (value); value = NULL;
|
||
err = stream_read_cstring (request, &value);
|
||
if (err)
|
||
{
|
||
if (opt.verbose)
|
||
log_error ("error reading ssh-agent env value\n");
|
||
goto leave;
|
||
}
|
||
if (opt.debug)
|
||
log_debug ("ssh-agent env '%s'='%s'\n", name, value);
|
||
err = session_env_setenv (ctrl->session_env, name,
|
||
*value? value : NULL);
|
||
if (err)
|
||
{
|
||
log_error ("error setting ssh-agent env value: %s\n",
|
||
gpg_strerror (err));
|
||
goto leave;
|
||
}
|
||
}
|
||
err = 0;
|
||
}
|
||
else if (!strcmp (exttype, "ssh-envnames@gnupg.org"))
|
||
{
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
if (!ret_err)
|
||
ret_err = stream_write_cstring
|
||
(response, session_env_list_stdenvnames (NULL, NULL));
|
||
goto finalleave;
|
||
}
|
||
else if (!strcmp (exttype, "session-bind@openssh.org"))
|
||
{
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
log_info ("ssh-agent extension '%s' ignored - returning success anyway\n",
|
||
exttype);
|
||
goto finalleave;
|
||
}
|
||
else
|
||
{
|
||
if (opt.verbose)
|
||
log_info ("ssh-agent extension '%s' not supported\n", exttype);
|
||
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
|
||
}
|
||
|
||
leave:
|
||
if (!err)
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_SUCCESS);
|
||
else
|
||
ret_err = stream_write_byte (response, SSH_RESPONSE_FAILURE);
|
||
finalleave:
|
||
xfree (exttype);
|
||
xfree (name);
|
||
xfree (value);
|
||
return ret_err;
|
||
}
|
||
|
||
|
||
|
||
/* Return the request specification for the request identified by TYPE
|
||
or NULL in case the requested request specification could not be
|
||
found. */
|
||
static const ssh_request_spec_t *
|
||
request_spec_lookup (int type)
|
||
{
|
||
const ssh_request_spec_t *spec;
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < DIM (request_specs); i++)
|
||
if (request_specs[i].type == type)
|
||
break;
|
||
if (i == DIM (request_specs))
|
||
{
|
||
if (opt.verbose)
|
||
log_info ("ssh request %u is not supported\n", type);
|
||
spec = NULL;
|
||
}
|
||
else
|
||
spec = request_specs + i;
|
||
|
||
return spec;
|
||
}
|
||
|
||
/* Process a single request. The request is read from and the
|
||
response is written to STREAM_SOCK. Uses CTRL as context. Returns
|
||
zero in case of success, non zero in case of failure. */
|
||
static int
|
||
ssh_request_process (ctrl_t ctrl, estream_t stream_sock)
|
||
{
|
||
const ssh_request_spec_t *spec;
|
||
estream_t response = NULL;
|
||
estream_t request = NULL;
|
||
unsigned char request_type;
|
||
gpg_error_t err;
|
||
int send_err = 0;
|
||
int ret;
|
||
unsigned char *request_data = NULL;
|
||
u32 request_data_size;
|
||
u32 response_size;
|
||
|
||
/* Create memory streams for request/response data. The entire
|
||
request will be stored in secure memory, since it might contain
|
||
secret key material. The response does not have to be stored in
|
||
secure memory, since we never give out secret keys.
|
||
|
||
Note: we only have little secure memory, but there is NO
|
||
possibility of DoS here; only trusted clients are allowed to
|
||
connect to the agent. What could happen is that the agent
|
||
returns out-of-secure-memory errors on requests in case the
|
||
agent's owner floods his own agent with many large messages.
|
||
-moritz */
|
||
|
||
/* Retrieve request. */
|
||
err = stream_read_string (stream_sock, 1, &request_data, &request_data_size);
|
||
if (err)
|
||
goto out;
|
||
|
||
if (opt.verbose > 1)
|
||
log_info ("received ssh request of length %u\n",
|
||
(unsigned int)request_data_size);
|
||
|
||
if (! request_data_size)
|
||
{
|
||
send_err = 1;
|
||
goto out;
|
||
/* Broken request; FIXME. */
|
||
}
|
||
|
||
request_type = request_data[0];
|
||
spec = request_spec_lookup (request_type);
|
||
if (! spec)
|
||
{
|
||
send_err = 1;
|
||
goto out;
|
||
/* Unknown request; FIXME. */
|
||
}
|
||
|
||
if (spec->secret_input)
|
||
request = es_mopen (NULL, 0, 0, 1, realloc_secure, gcry_free, "r+b");
|
||
else
|
||
request = es_mopen (NULL, 0, 0, 1, gcry_realloc, gcry_free, "r+b");
|
||
if (! request)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
ret = es_setvbuf (request, NULL, _IONBF, 0);
|
||
if (ret)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
err = stream_write_data (request, request_data + 1, request_data_size - 1);
|
||
if (err)
|
||
goto out;
|
||
es_rewind (request);
|
||
|
||
response = es_fopenmem (0, "r+b");
|
||
if (! response)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto out;
|
||
}
|
||
|
||
if (opt.verbose)
|
||
log_info ("ssh request handler for %s (%u) started\n",
|
||
spec->identifier, spec->type);
|
||
|
||
err = (*spec->handler) (ctrl, request, response);
|
||
|
||
if (opt.verbose)
|
||
{
|
||
if (err)
|
||
log_info ("ssh request handler for %s (%u) failed: %s\n",
|
||
spec->identifier, spec->type, gpg_strerror (err));
|
||
else
|
||
log_info ("ssh request handler for %s (%u) ready\n",
|
||
spec->identifier, spec->type);
|
||
}
|
||
|
||
if (err)
|
||
{
|
||
send_err = 1;
|
||
goto out;
|
||
}
|
||
|
||
response_size = es_ftell (response);
|
||
if (opt.verbose > 1)
|
||
log_info ("sending ssh response of length %u\n",
|
||
(unsigned int)response_size);
|
||
|
||
err = es_fseek (response, 0, SEEK_SET);
|
||
if (err)
|
||
{
|
||
send_err = 1;
|
||
goto out;
|
||
}
|
||
|
||
err = stream_write_uint32 (stream_sock, response_size);
|
||
if (err)
|
||
{
|
||
send_err = 1;
|
||
goto out;
|
||
}
|
||
|
||
err = stream_copy (stream_sock, response);
|
||
if (err)
|
||
goto out;
|
||
|
||
err = es_fflush (stream_sock);
|
||
if (err)
|
||
goto out;
|
||
|
||
out:
|
||
|
||
if (err && es_feof (stream_sock))
|
||
log_error ("error occurred while processing request: %s\n",
|
||
gpg_strerror (err));
|
||
|
||
if (send_err)
|
||
{
|
||
if (opt.verbose > 1)
|
||
log_info ("sending ssh error response\n");
|
||
err = stream_write_uint32 (stream_sock, 1);
|
||
if (err)
|
||
goto leave;
|
||
err = stream_write_byte (stream_sock, SSH_RESPONSE_FAILURE);
|
||
if (err)
|
||
goto leave;
|
||
}
|
||
|
||
leave:
|
||
|
||
es_fclose (request);
|
||
es_fclose (response);
|
||
xfree (request_data);
|
||
|
||
return !!err;
|
||
}
|
||
|
||
|
||
/* Return the peer's pid. */
|
||
static void
|
||
get_client_info (gnupg_fd_t fd, struct peer_info_s *out)
|
||
{
|
||
pid_t client_pid = (pid_t)(-1);
|
||
int client_uid = -1;
|
||
|
||
#ifdef SO_PEERCRED
|
||
{
|
||
#ifdef HAVE_STRUCT_SOCKPEERCRED_PID
|
||
struct sockpeercred cr;
|
||
#else
|
||
struct ucred cr;
|
||
#endif
|
||
socklen_t cl = sizeof cr;
|
||
|
||
if (!getsockopt (FD2INT (fd), SOL_SOCKET, SO_PEERCRED, &cr, &cl))
|
||
{
|
||
#if defined (HAVE_STRUCT_SOCKPEERCRED_PID) || defined (HAVE_STRUCT_UCRED_PID)
|
||
client_pid = cr.pid;
|
||
client_uid = (int)cr.uid;
|
||
#elif defined (HAVE_STRUCT_UCRED_CR_PID)
|
||
client_pid = cr.cr_pid;
|
||
client_uid = (int)cr.cr_uid;
|
||
#else
|
||
#error "Unknown SO_PEERCRED struct"
|
||
#endif
|
||
}
|
||
}
|
||
#elif defined (LOCAL_PEERPID)
|
||
{
|
||
socklen_t len = sizeof (pid_t);
|
||
|
||
getsockopt (FD2INT (fd), SOL_LOCAL, LOCAL_PEERPID, &client_pid, &len);
|
||
#if defined (LOCAL_PEERCRED)
|
||
{
|
||
struct xucred cr;
|
||
len = sizeof (struct xucred);
|
||
|
||
if (!getsockopt (FD2INT (fd), SOL_LOCAL, LOCAL_PEERCRED, &cr, &len))
|
||
client_uid = (int)cr.cr_uid;
|
||
}
|
||
#endif
|
||
}
|
||
#elif defined (LOCAL_PEEREID)
|
||
{
|
||
struct unpcbid unp;
|
||
socklen_t unpl = sizeof unp;
|
||
|
||
if (getsockopt (FD2INT (fd), 0, LOCAL_PEEREID, &unp, &unpl) != -1)
|
||
{
|
||
client_pid = unp.unp_pid;
|
||
client_uid = (int)unp.unp_euid;
|
||
}
|
||
}
|
||
#elif defined (HAVE_GETPEERUCRED)
|
||
{
|
||
ucred_t *ucred = NULL;
|
||
|
||
if (getpeerucred (FD2INT (fd), &ucred) != -1)
|
||
{
|
||
client_pid = ucred_getpid (ucred);
|
||
client_uid = (int)ucred_geteuid (ucred);
|
||
ucred_free (ucred);
|
||
}
|
||
}
|
||
#else
|
||
(void)fd;
|
||
#endif
|
||
|
||
out->pid = (client_pid == (pid_t)(-1)? 0 : (unsigned long)client_pid);
|
||
out->uid = client_uid;
|
||
}
|
||
|
||
|
||
/* Start serving client on STREAM. */
|
||
void
|
||
start_command_handler_ssh_stream (ctrl_t ctrl, estream_t stream)
|
||
{
|
||
gpg_error_t err;
|
||
int ret;
|
||
|
||
err = agent_copy_startup_env (ctrl);
|
||
if (err)
|
||
goto out;
|
||
|
||
/* We have to disable the estream buffering, because the estream
|
||
core doesn't know about secure memory. */
|
||
ret = es_setvbuf (stream, NULL, _IONBF, 0);
|
||
if (ret)
|
||
{
|
||
log_error ("failed to disable buffering on socket stream: %s\n",
|
||
strerror (errno));
|
||
goto out;
|
||
}
|
||
|
||
/* Main processing loop. */
|
||
while ( !ssh_request_process (ctrl, stream) )
|
||
{
|
||
/* Check whether we have reached EOF before trying to read
|
||
another request. */
|
||
int c;
|
||
|
||
c = es_fgetc (stream);
|
||
if (c == EOF)
|
||
break;
|
||
es_ungetc (c, stream);
|
||
}
|
||
|
||
/* Reset the daemon in case it has been used. */
|
||
agent_reset_daemon (ctrl);
|
||
|
||
out:
|
||
es_fclose (stream);
|
||
}
|
||
|
||
|
||
/* Start serving client on SOCK_CLIENT. */
|
||
void
|
||
start_command_handler_ssh (ctrl_t ctrl, gnupg_fd_t sock_client)
|
||
{
|
||
estream_t stream_sock;
|
||
struct peer_info_s peer_info;
|
||
es_syshd_t syshd;
|
||
|
||
syshd.type = ES_SYSHD_SOCK;
|
||
#ifdef HAVE_SOCKET
|
||
syshd.u.sock = (SOCKET)sock_client;
|
||
#else
|
||
syshd.u.sock = sock_client;
|
||
#endif
|
||
|
||
get_client_info (sock_client, &peer_info);
|
||
ctrl->client_pid = peer_info.pid;
|
||
ctrl->client_uid = peer_info.uid;
|
||
|
||
/* Create stream from socket. */
|
||
stream_sock = es_sysopen (&syshd, "r+");
|
||
if (!stream_sock)
|
||
{
|
||
log_error (_("failed to create stream from socket: %s\n"),
|
||
strerror (errno));
|
||
return;
|
||
}
|
||
|
||
start_command_handler_ssh_stream (ctrl, stream_sock);
|
||
}
|
||
|
||
|
||
#ifdef HAVE_W32_SYSTEM
|
||
/* Serve one ssh-agent request. This is used for the Putty support.
|
||
REQUEST is the mmapped memory which may be accessed up to a
|
||
length of MAXREQLEN. Returns 0 on success which also indicates
|
||
that a valid SSH response message is now in REQUEST. */
|
||
int
|
||
serve_mmapped_ssh_request (ctrl_t ctrl,
|
||
unsigned char *request, size_t maxreqlen)
|
||
{
|
||
gpg_error_t err;
|
||
int send_err = 0;
|
||
int valid_response = 0;
|
||
const ssh_request_spec_t *spec;
|
||
u32 msglen;
|
||
estream_t request_stream, response_stream;
|
||
|
||
if (agent_copy_startup_env (ctrl))
|
||
goto leave; /* Error setting up the environment. */
|
||
|
||
if (maxreqlen < 5)
|
||
goto leave; /* Caller error. */
|
||
|
||
msglen = uint32_construct (request[0], request[1], request[2], request[3]);
|
||
if (msglen < 1 || msglen > maxreqlen - 4)
|
||
{
|
||
log_error ("ssh message len (%u) out of range", (unsigned int)msglen);
|
||
goto leave;
|
||
}
|
||
|
||
spec = request_spec_lookup (request[4]);
|
||
if (!spec)
|
||
{
|
||
send_err = 1; /* Unknown request type. */
|
||
goto leave;
|
||
}
|
||
|
||
/* Create a stream object with the data part of the request. */
|
||
if (spec->secret_input)
|
||
request_stream = es_mopen (NULL, 0, 0, 1, realloc_secure, gcry_free, "r+");
|
||
else
|
||
request_stream = es_mopen (NULL, 0, 0, 1, gcry_realloc, gcry_free, "r+");
|
||
if (!request_stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
/* We have to disable the estream buffering, because the estream
|
||
core doesn't know about secure memory. */
|
||
if (es_setvbuf (request_stream, NULL, _IONBF, 0))
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
/* Copy the request to the stream but omit the request type. */
|
||
err = stream_write_data (request_stream, request + 5, msglen - 1);
|
||
if (err)
|
||
goto leave;
|
||
es_rewind (request_stream);
|
||
|
||
response_stream = es_fopenmem (0, "r+b");
|
||
if (!response_stream)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
|
||
if (opt.verbose)
|
||
log_info ("ssh request handler for %s (%u) started\n",
|
||
spec->identifier, spec->type);
|
||
|
||
err = (*spec->handler) (ctrl, request_stream, response_stream);
|
||
|
||
if (opt.verbose)
|
||
{
|
||
if (err)
|
||
log_info ("ssh request handler for %s (%u) failed: %s\n",
|
||
spec->identifier, spec->type, gpg_strerror (err));
|
||
else
|
||
log_info ("ssh request handler for %s (%u) ready\n",
|
||
spec->identifier, spec->type);
|
||
}
|
||
|
||
es_fclose (request_stream);
|
||
request_stream = NULL;
|
||
|
||
if (err)
|
||
{
|
||
send_err = 1;
|
||
goto leave;
|
||
}
|
||
|
||
/* Put the response back into the mmapped buffer. */
|
||
{
|
||
void *response_data;
|
||
size_t response_size;
|
||
|
||
/* NB: In contrast to the request-stream, the response stream
|
||
includes the message type byte. */
|
||
if (es_fclose_snatch (response_stream, &response_data, &response_size))
|
||
{
|
||
log_error ("snatching ssh response failed: %s",
|
||
gpg_strerror (gpg_error_from_syserror ()));
|
||
send_err = 1; /* Ooops. */
|
||
goto leave;
|
||
}
|
||
|
||
if (opt.verbose > 1)
|
||
log_info ("sending ssh response of length %u\n",
|
||
(unsigned int)response_size);
|
||
if (response_size > maxreqlen - 4)
|
||
{
|
||
log_error ("invalid length of the ssh response: %s",
|
||
gpg_strerror (GPG_ERR_INTERNAL));
|
||
es_free (response_data);
|
||
send_err = 1;
|
||
goto leave;
|
||
}
|
||
|
||
request[0] = response_size >> 24;
|
||
request[1] = response_size >> 16;
|
||
request[2] = response_size >> 8;
|
||
request[3] = response_size >> 0;
|
||
memcpy (request+4, response_data, response_size);
|
||
es_free (response_data);
|
||
valid_response = 1;
|
||
}
|
||
|
||
leave:
|
||
if (send_err)
|
||
{
|
||
request[0] = 0;
|
||
request[1] = 0;
|
||
request[2] = 0;
|
||
request[3] = 1;
|
||
request[4] = SSH_RESPONSE_FAILURE;
|
||
valid_response = 1;
|
||
}
|
||
|
||
/* Reset the daemon in case it has been used. */
|
||
agent_reset_daemon (ctrl);
|
||
|
||
return valid_response? 0 : -1;
|
||
}
|
||
#endif /*HAVE_W32_SYSTEM*/
|