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397 lines
14 KiB
C
397 lines
14 KiB
C
/* packet.h - packet read/write stuff
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* Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef GPG_PACKET_H
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#define GPG_PACKET_H
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#include "types.h"
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#include "iobuf.h"
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#include "filter.h"
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#ifndef DID_MPI_TYPEDEF
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typedef struct gcry_mpi *MPI;
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#define DID_MPI_TYPEDEF
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#endif
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#define GNUPG_MAX_NPKEY 4
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#define GNUPG_MAX_NSKEY 6
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#define GNUPG_MAX_NSIG 2
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#define GNUPG_MAX_NENC 2
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#define DEBUG_PARSE_PACKET 1
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typedef enum {
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PKT_NONE =0,
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PKT_PUBKEY_ENC =1, /* public key encrypted packet */
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PKT_SIGNATURE =2, /* secret key encrypted packet */
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PKT_SYMKEY_ENC =3, /* session key packet (OpenPGP)*/
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PKT_ONEPASS_SIG =4, /* one pass sig packet (OpenPGP)*/
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PKT_SECRET_KEY =5, /* secret key */
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PKT_PUBLIC_KEY =6, /* public key */
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PKT_SECRET_SUBKEY =7, /* secret subkey (OpenPGP) */
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PKT_COMPRESSED =8, /* compressed data packet */
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PKT_ENCRYPTED =9, /* conventional encrypted data */
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PKT_MARKER =10, /* marker packet (OpenPGP) */
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PKT_PLAINTEXT =11, /* plaintext data with filename and mode */
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PKT_RING_TRUST =12, /* keyring trust packet */
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PKT_USER_ID =13, /* user id packet */
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PKT_PUBLIC_SUBKEY =14, /* public subkey (OpenPGP) */
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PKT_OLD_COMMENT =16, /* comment packet from an OpenPGP draft */
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PKT_PHOTO_ID =17, /* PGP's photo ID */
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PKT_ENCRYPTED_MDC =18, /* integrity protected encrypted data */
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PKT_MDC =19, /* manipulaion detection code packet */
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PKT_COMMENT =61, /* new comment packet (private) */
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} pkttype_t;
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typedef struct packet_struct PACKET;
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typedef struct {
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int mode;
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byte hash_algo;
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byte salt[8];
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u32 count;
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} STRING2KEY;
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typedef struct {
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byte version;
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byte cipher_algo; /* cipher algorithm used */
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STRING2KEY s2k;
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byte seskeylen; /* keylength in byte or 0 for no seskey */
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byte seskey[1];
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} PKT_symkey_enc;
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typedef struct {
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u32 keyid[2]; /* 64 bit keyid */
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byte version;
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byte pubkey_algo; /* algorithm used for public key scheme */
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byte throw_keyid;
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MPI data[GNUPG_MAX_NENC];
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} PKT_pubkey_enc;
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typedef struct {
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u32 keyid[2]; /* 64 bit keyid */
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byte sig_class; /* sig classification */
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byte digest_algo; /* algorithm used for digest */
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byte pubkey_algo; /* algorithm used for public key scheme */
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byte last; /* a stupid flag */
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} PKT_onepass_sig;
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typedef struct {
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ulong local_id; /* internal use, valid if > 0 */
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struct {
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unsigned checked:1; /* signature has been checked */
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unsigned valid:1; /* signature is good (if checked is set) */
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unsigned unknown_critical:1;
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} flags;
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u32 keyid[2]; /* 64 bit keyid */
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u32 timestamp; /* signature made */
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byte version;
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byte sig_class; /* sig classification, append for MD calculation*/
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byte pubkey_algo; /* algorithm used for public key scheme */
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/* (GCRY_PK_xxx) */
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byte digest_algo; /* algorithm used for digest (DIGEST_ALGO_xxxx) */
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byte *hashed_data; /* all subpackets with hashed data (v4 only) */
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byte *unhashed_data; /* ditto for unhashed data */
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byte digest_start[2]; /* first 2 bytes of the digest */
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MPI data[GNUPG_MAX_NSIG];
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} PKT_signature;
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/****************
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* Note about the pkey/skey elements: We assume that the secret keys
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* has the same elemts as the public key at the begin of the array, so
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* that npkey < nskey and it is possible to compare the secret and
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* public keys by comparing the first npkey elements of pkey againts skey.
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*/
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typedef struct {
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u32 timestamp; /* key made */
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u32 expiredate; /* expires at this date or 0 if not at all */
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byte hdrbytes; /* number of header bytes */
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byte version;
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byte pubkey_algo; /* algorithm used for public key scheme */
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byte pubkey_usage; /* the actual allowed usage as set by getkey() */
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u32 created; /* according to the self-signature */
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byte req_usage; /* hack to pass a request to getkey() */
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byte req_algo; /* Ditto */
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u32 has_expired; /* set to the expiration date if expired */
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int is_revoked; /* key has been revoked */
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int is_valid; /* key (especially subkey) is valid */
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ulong local_id; /* internal use, valid if > 0 */
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u32 main_keyid[2]; /* keyid of the primary key */
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u32 keyid[2]; /* calculated by keyid_from_pk() */
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byte *namehash; /* if != NULL: found by this name */
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MPI pkey[GNUPG_MAX_NPKEY];
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} PKT_public_key;
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typedef struct {
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u32 timestamp; /* key made */
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u32 expiredate; /* expires at this date or 0 if not at all */
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byte hdrbytes; /* number of header bytes */
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byte version;
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byte pubkey_algo; /* algorithm used for public key scheme */
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byte pubkey_usage;
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u32 created; /* according to the self-signature */
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byte req_usage;
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byte req_algo;
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u32 has_expired; /* set to the expiration date if expired */
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int is_revoked; /* key has been revoked */
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int is_valid; /* key (especially subkey) is valid */
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u32 main_keyid[2]; /* keyid of the primary key */
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u32 keyid[2];
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byte is_primary;
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byte is_protected; /* The secret info is protected and must */
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/* be decrypted before use, the protected */
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/* MPIs are simply (void*) pointers to memory */
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/* and should never be passed to a mpi_xxx() */
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struct {
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byte algo; /* cipher used to protect the secret information*/
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STRING2KEY s2k;
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byte ivlen; /* used length of the iv */
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byte iv[16]; /* initialization vector for CFB mode */
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} protect;
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MPI skey[GNUPG_MAX_NSKEY];
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u16 csum; /* checksum */
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} PKT_secret_key;
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typedef struct {
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int len; /* length of data */
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char data[1];
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} PKT_comment;
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typedef struct {
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ulong stored_at; /* the stream offset where it was stored
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* by build-packet */
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int len; /* length of the name */
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char *photo; /* if this is not NULL, the packet is a photo ID */
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int photolen; /* and the length of the photo */
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int help_key_usage;
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u32 help_key_expire;
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int is_primary;
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u32 created; /* according to the self-signature */
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char name[1];
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} PKT_user_id;
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typedef struct {
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u32 len; /* reserved */
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byte new_ctb;
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byte algorithm;
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IOBUF buf; /* IOBUF reference */
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} PKT_compressed;
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typedef struct {
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u32 len; /* length of encrypted data */
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byte new_ctb; /* uses a new CTB */
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byte mdc_method; /* > 0: integrity protected encrypted data packet */
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IOBUF buf; /* IOBUF reference */
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} PKT_encrypted;
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typedef struct {
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byte hash[20];
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} PKT_mdc;
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typedef struct {
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unsigned int trustval;
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} PKT_ring_trust;
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typedef struct {
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u32 len; /* length of encrypted data */
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IOBUF buf; /* IOBUF reference */
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byte new_ctb;
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int mode;
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u32 timestamp;
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int namelen;
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char name[1];
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} PKT_plaintext;
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/* combine all packets into a union */
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struct packet_struct {
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pkttype_t pkttype;
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union {
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void *generic;
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PKT_symkey_enc *symkey_enc; /* PKT_SYMKEY_ENC */
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PKT_pubkey_enc *pubkey_enc; /* PKT_PUBKEY_ENC */
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PKT_onepass_sig *onepass_sig; /* PKT_ONEPASS_SIG */
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PKT_signature *signature; /* PKT_SIGNATURE */
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PKT_public_key *public_key; /* PKT_PUBLIC_[SUB)KEY */
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PKT_secret_key *secret_key; /* PKT_SECRET_[SUB]KEY */
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PKT_comment *comment; /* PKT_COMMENT */
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PKT_user_id *user_id; /* PKT_USER_ID */
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PKT_compressed *compressed; /* PKT_COMPRESSED */
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PKT_encrypted *encrypted; /* PKT_ENCRYPTED[_MDC] */
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PKT_mdc *mdc; /* PKT_MDC */
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PKT_ring_trust *ring_trust; /* PKT_RING_TRUST */
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PKT_plaintext *plaintext; /* PKT_PLAINTEXT */
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} pkt;
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};
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#define init_packet(a) do { (a)->pkttype = 0; \
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(a)->pkt.generic = NULL; \
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} while(0)
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typedef enum {
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SIGSUBPKT_TEST_CRITICAL=-3,
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SIGSUBPKT_LIST_UNHASHED=-2,
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SIGSUBPKT_LIST_HASHED =-1,
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SIGSUBPKT_NONE = 0,
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SIGSUBPKT_SIG_CREATED = 2, /* signature creation time */
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SIGSUBPKT_SIG_EXPIRE = 3, /* signature expiration time */
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SIGSUBPKT_EXPORTABLE = 4, /* exportable */
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SIGSUBPKT_TRUST = 5, /* trust signature */
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SIGSUBPKT_REGEXP = 6, /* regular expression */
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SIGSUBPKT_REVOCABLE = 7, /* revocable */
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SIGSUBPKT_KEY_EXPIRE = 9, /* key expiration time */
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SIGSUBPKT_ARR =10, /* additional recipient request */
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SIGSUBPKT_PREF_SYM =11, /* preferred symmetric algorithms */
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SIGSUBPKT_REV_KEY =12, /* revocation key */
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SIGSUBPKT_ISSUER =16, /* issuer key ID */
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SIGSUBPKT_NOTATION =20, /* notation data */
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SIGSUBPKT_PREF_HASH =21, /* preferred hash algorithms */
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SIGSUBPKT_PREF_COMPR =22, /* preferred compression algorithms */
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SIGSUBPKT_KS_FLAGS =23, /* key server preferences */
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SIGSUBPKT_PREF_KS =24, /* preferred key server */
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SIGSUBPKT_PRIMARY_UID =25, /* primary user id */
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SIGSUBPKT_POLICY =26, /* policy URL */
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SIGSUBPKT_KEY_FLAGS =27, /* key flags */
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SIGSUBPKT_SIGNERS_UID =28, /* signer's user id */
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SIGSUBPKT_REVOC_REASON =29, /* reason for revocation */
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SIGSUBPKT_FEATURES =30, /* feature flags */
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SIGSUBPKT_PRIV_ADD_SIG =101,/* signatur is also valid for this uid */
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SIGSUBPKT_FLAG_CRITICAL=128
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} sigsubpkttype_t;
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/*-- mainproc.c --*/
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int proc_packets( void *ctx, IOBUF a );
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int proc_signature_packets( void *ctx, IOBUF a,
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STRLIST signedfiles, const char *sigfile );
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int proc_encryption_packets( void *ctx, IOBUF a );
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int list_packets( IOBUF a );
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/*-- parse-packet.c --*/
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int set_packet_list_mode( int mode );
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#if DEBUG_PARSE_PACKET
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int dbg_search_packet( IOBUF inp, PACKET *pkt, int pkttype, ulong *retpos, const char* file, int lineno );
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int dbg_parse_packet( IOBUF inp, PACKET *ret_pkt, ulong *pos,
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const char* file, int lineno );
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int dbg_copy_all_packets( IOBUF inp, IOBUF out, const char* file, int lineno );
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int dbg_copy_some_packets( IOBUF inp, IOBUF out, ulong stopoff, const char* file, int lineno );
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int dbg_skip_some_packets( IOBUF inp, unsigned n, const char* file, int lineno );
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#define search_packet( a,b,c,d ) dbg_search_packet( (a), (b), (c), (d), __FILE__, __LINE__ )
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#define parse_packet( a, b, c ) dbg_parse_packet( (a), (b), (c), __FILE__, __LINE__ )
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#define copy_all_packets( a,b ) dbg_copy_all_packets((a),(b), __FILE__, __LINE__ )
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#define copy_some_packets( a,b,c ) dbg_copy_some_packets((a),(b),(c), __FILE__, __LINE__ )
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#define skip_some_packets( a,b ) dbg_skip_some_packets((a),(b), __FILE__, __LINE__ )
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#else
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int search_packet( IOBUF inp, PACKET *pkt, int pkttype, ulong *retpos );
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int parse_packet( IOBUF inp, PACKET *ret_pkt, ulong *retpos);
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int copy_all_packets( IOBUF inp, IOBUF out );
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int copy_some_packets( IOBUF inp, IOBUF out, ulong stopoff );
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int skip_some_packets( IOBUF inp, unsigned n );
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#endif
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const byte *enum_sig_subpkt( const byte *buffer, sigsubpkttype_t reqtype,
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size_t *ret_n, int *start );
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const byte *parse_sig_subpkt( const byte *buffer, sigsubpkttype_t reqtype,
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size_t *ret_n );
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const byte *parse_sig_subpkt2( PKT_signature *sig,
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sigsubpkttype_t reqtype, size_t *ret_n );
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/*-- build-packet.c --*/
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int build_packet( IOBUF inp, PACKET *pkt );
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u32 calc_packet_length( PACKET *pkt );
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void hash_public_key( GCRY_MD_HD md, PKT_public_key *pk );
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void build_sig_subpkt( PKT_signature *sig, sigsubpkttype_t type,
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const byte *buffer, size_t buflen );
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void build_sig_subpkt_from_sig( PKT_signature *sig );
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/*-- free-packet.c --*/
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void free_symkey_enc( PKT_symkey_enc *enc );
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void free_pubkey_enc( PKT_pubkey_enc *enc );
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void free_seckey_enc( PKT_signature *enc );
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int digest_algo_from_sig( PKT_signature *sig );
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void release_public_key_parts( PKT_public_key *pk );
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void free_public_key( PKT_public_key *key );
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void release_secret_key_parts( PKT_secret_key *sk );
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void free_secret_key( PKT_secret_key *sk );
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void free_user_id( PKT_user_id *uid );
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void free_comment( PKT_comment *rem );
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void free_packet( PACKET *pkt );
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PKT_public_key *copy_public_key( PKT_public_key *d, PKT_public_key *s );
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PKT_public_key *copy_public_key_new_namehash( PKT_public_key *d,
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PKT_public_key *s,
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const byte *namehash );
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void copy_public_parts_to_secret_key( PKT_public_key *pk,
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PKT_secret_key *sk );
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PKT_secret_key *copy_secret_key( PKT_secret_key *d, PKT_secret_key *s );
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PKT_signature *copy_signature( PKT_signature *d, PKT_signature *s );
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PKT_user_id *copy_user_id( PKT_user_id *d, PKT_user_id *s );
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int cmp_public_keys( PKT_public_key *a, PKT_public_key *b );
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int cmp_secret_keys( PKT_secret_key *a, PKT_secret_key *b );
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int cmp_signatures( PKT_signature *a, PKT_signature *b );
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int cmp_public_secret_key( PKT_public_key *pk, PKT_secret_key *sk );
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int cmp_user_ids( PKT_user_id *a, PKT_user_id *b );
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/*-- sig-check.c --*/
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int signature_check( PKT_signature *sig, GCRY_MD_HD digest );
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/*-- seckey-cert.c --*/
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int is_secret_key_protected( PKT_secret_key *sk );
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int check_secret_key( PKT_secret_key *sk, int retries );
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int protect_secret_key( PKT_secret_key *sk, DEK *dek );
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/*-- pubkey-enc.c --*/
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int get_session_key( PKT_pubkey_enc *k, DEK *dek );
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/*-- compress.c --*/
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int handle_compressed( void *ctx, PKT_compressed *cd,
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int (*callback)(IOBUF, void *), void *passthru );
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/*-- encr-data.c --*/
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int decrypt_data( void *ctx, PKT_encrypted *ed, DEK *dek );
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/*-- plaintext.c --*/
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int handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx,
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int nooutput, int clearsig );
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int ask_for_detached_datafile( GCRY_MD_HD md, GCRY_MD_HD md2,
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const char *inname, int textmode );
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/*-- comment.c --*/
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int write_comment( IOBUF out, const char *s );
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/*-- sign.c --*/
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int make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
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PKT_user_id *uid, PKT_public_key *subpk,
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PKT_secret_key *sk,
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int sigclass, int digest_algo,
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int (*mksubpkt)(PKT_signature *, void *),
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void *opaque );
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/*-- keygen.c --*/
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PKT_user_id *generate_user_id(void);
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#endif /*GPG_PACKET_H*/
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