* agent/command-ssh.c (get_client_info): Use LOCAL_PEERCRED.
--
LOCAL_PEERUID was wrong (while there is LOCAL_PEERUUID).
For FreeBSD and macOS, we can use LOCAL_PEERCRED to get uid.
GnuPG-bug-id: 3757
Fixes-commit: 28aa689058
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* configure.ac: Check ucred.h as well as sys/ucred.h.
* agent/command-ssh.c: Add inclusion of ucred.h.
--
It was T2981, adding ucred.h for Solaris. We also need sys/ucred.h
for FreeBSD and macOS.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* agent/agent.h (server_control_s): Add field 'client_uid'.
* agent/call-pinentry.c (start_pinentry): Add uid field to assuan
option "owner" sent to pinentry.
* agent/command-ssh.c (peer_info_s): New static struct.
(get_client_pid): Rename to...
(get_client_info): Here, and extract uid in addition to pid.
(start_command_handler_ssh): Use get_client_info() instead of
get_client_pid().
* agent/command.c (start_command_handler): Try assuan_get_peercred,
and only fall back to assuan_get_pid when assuan_get_peercred fails.
--
This also requires an update to pinentry to handle the new uid field.
Distributing the uid as well as the pid makes it harder for a
different user on the same machine to take advantage of any race
conditions between when a requesting process might ask for something
that needs pinentry, and when pinentry gets around to inspecting the
state of that process.
We put the uid before the nodename because the uid is guaranteed to be
a integer (represented in decimal), which makes it much simpler to
parse past than the potentially arbitrarily structured nodename.
Use a / instead of whitespace to delimit pid/uid at Werner's request.
If we were willing to depend on the nodename being
whitespace-delimited (as the current, unreleased pinentry code does),
then we could add the uid after the nodename. But since no released
pinentry depends on this option anyway, i think we should make the
more conservative, easily-parseable choice and put the user ID first.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
* agent/command-ssh.c (ssh_key_to_protected_buffer): If the empty
passphrase is supplied, do not protect the key.
GnuPG-bug-id: 2856
Signed-off-by: Justus Winter <justus@g10code.com>
* agent/agent.h (opt): New field 'ssh_fingerprint_digest'.
* agent/command-ssh.c (data_sign, ssh_identity_register): Honor the
option for strings used to communicate with the user.
* agent/findkey.c (agent_modify_description): Likewise.
* agent/gpg-agent.c (cmd_and_opt_values): New value.
(opts): New option '--ssh-fingerprint-digest'.
(parse_rereadable_options): Set the default to MD5 for now.
(main): Handle the new option.
* doc/gpg-agent.texi: Document the new option.
--
OpenSSH has transitioned from using MD5 to compute key fingerprints to
SHA256. This patch makes the digest used when communicating key
fingerprints to the user (e.g. in pinentry dialogs) configurable.
For now this patch conservatively defaults to MD5.
GnuPG-bug-id: 2106
Signed-off-by: Justus Winter <justus@g10code.com>
* agent/command-ssh.c (add_control_entry): Hand in the key, write both
the MD5- and the SHA256-based fingerprint to the 'sshcontrol' file
when adding ssh keys.
(ssh_identity_register): Adapt callsite.
GnuPG-bug-id: 2106
Signed-off-by: Justus Winter <justus@g10code.com>
* agent/Makefile.am (AM_CPPFLAGS): Remove -I$(top_srcdir)/common.
* agent/call-pinentry.c, agent/call-scd.c: Follow the change.
* agent/command-ssh.c, agent/command.c, agent/cvt-openpgp.c: Ditto.
* agent/divert-scd.c, agent/findkey.c, agent/genkey.c: Ditto.
* agent/gpg-agent.c, agent/pksign.c, agent/preset-passphrase.c: Ditto.
* agent/protect-tool.c, agent/protect.c, agent/trustlist.c: Ditto.
* agent/w32main.c: Ditto.
--
For openpty function, we need to include util.h on some OS.
We also have util.h in common/, so this change is needed.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* configure.ac: Simply check getpeerucred and ucred.h, and structure
members.
* agent/command-ssh.c: Include ucred.h.
(get_client_pid) [HAVE_STRUCT_SOCKPEERCRED_PID]: Use sockpeercred
structure for OpenBSD.
[LOCAL_PEERPID]: Use LOCAL_PEERPID for macOS.
[LOCAL_PEEREID]: Use LOCAL_PEEREID for NetBSD.
[HAVE_GETPEERUCRED]: Use getpeerucred for OpenSolaris.
--
This change also addresses following bug.
GnuPG-bug-id: 2981.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* agent/command-ssh.c (card_key_list): Return 0 when
agent_card_serialno returns an error.
(ssh_handler_request_identities): Handle errors for card listing
and proceed to other cases.
--
GnuPG-bug-id: 2980
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* agent/call-scd.c (card_cardlist_cb, agent_card_cardlist): New.
* agent/command-ssh.c (card_key_list): New.
(ssh_handler_request_identities): Call card_key_list and loop for the
list to send public keys for all available cards.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* agent/command-ssh.c (sexp_key_construct): Lowercase the algo name.
--
We need to use a lowercase version of the algo in S-expression.
Unfortunately Libgcrypt has no function for this, thus we need to
malloc and first.
Fixes-commit: ebf24e3
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (ssh_handler_request_identities): Skip a key with
error, not giving up to handle the request itself.
* agent/cvt-openpgp.c (extract_private_key): Support "ecdsa" key.
--
Note that "ecdsa" key is still in use by old versions of gpg-agent
through its SSH handling (until 2.1.14). With old versions of
gpg-agent, adding ECDSA key by ssh-add command, "ecdsa" key will be
created. So, "ecdsa" key should be supported.
For g10/gpg, "ecdsa" and "ecdh" was only used in some experimental
versions of libgcrypt, with parameters. We now use "ecc" for all cases
in released versions.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* common/util.h (get_pk_algo_from_key): New.
* common/sexputil.c (get_pk_algo_from_key): The implementation.
* agent/gpg-agent.c: Remove include of openpgpdefs.h.
* agent/command-ssh.c (struct ssh_key_type_spec): Use integer ALGO.
(ssh_key_types): Update with GCRY_PK_*.
(make_cstring, sexp_extract_identifier): Remove.
(sexp_key_construct): Use gcry_pk_algo_name to get ALGO string.
(ssh_key_to_blob): Use cadr to get value list.
(ssh_key_type_lookup): Lookup with integer ALGO.
(ssh_receive_key): Follow the change of ssh_key_type_lookup.
(ssh_send_key_public): Likewise. Use get_pk_algo_from_key to get ALGO.
--
This fixes the regresson introduced by the commit
894789c329.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* agent/command-ssh.c (ssh_identity_register): Add a key to sshcontrol
even if it is already in the private key store.
* tests/openpgp/ssh.scm: Test this.
GnuPG-bug-id: 2316
Signed-off-by: Justus Winter <justus@g10code.com>
* agent/protect.c (agent_protect): Add arg use_ocb. Change all caller
to pass -1 for default.
* agent/protect-tool.c: New option --debug-use-ocb.
(oDebugUseOCB): New.
(opt_debug_use_ocb): New.
(main): Set option.
(read_and_protect): Implement option.
* agent/protect.c (OCB_MODE_SUPPORTED): New macro.
(PROT_DEFAULT_TO_OCB): New macro.
(do_encryption): Add args use_ocb, hashbegin, hashlen, timestamp_exp,
and timestamp_exp_len. Implement OCB.
(agent_protect): Change to support OCB.
(do_decryption): Add new args is_ocb, aadhole_begin, and aadhole_len.
Implement OCB.
(merge_lists): Allow NULL for sha1hash.
(agent_unprotect): Change to support OCB.
(agent_private_key_type): Remove debug output.
--
Instead of using the old OpenPGP way of appending a hash of the
plaintext and encrypt that along with the plaintext, the new scheme
uses a proper authenticated encryption mode. See keyformat.txt for a
description. Libgcrypt 1.7 is required.
This mode is not yet enabled because there would be no way to return
to an older GnuPG version. To test the new scheme use
gpg-protect-tool:
./gpg-protect-tool -av -P abc -p --debug-use-ocb <plain.key >prot.key
./gpg-protect-tool -av -P abc -u <prot.key
Any key from the private key storage should work.
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (SPEC_FLAG_WITH_CERT): New.
(ssh_key_types): Add OpenSSH cert types.
(stream_read_string): Allow a dummy read.
(ssh_receive_mpint_list): Pass SPEC by reference.
(ssh_receive_mpint_list): New arg CERT and use it.
(ssh_receive_key): Read certificate into an estream object and modify
parser to make use of that object.
--
This is a first step to support certificate via the agent. The only
effect of this change is the removal of an error message parsing the
certificate. Note that ssh-add sends the private key anyway first and
only then follows with the certificate+private key.
What we need to implement next is a way to store the certificate in
the agent and return it on request.
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/genkey.c (agent_ask_new_passphrase): Use a separate malloc for
PI2. Check return value of the malloc function.
* agent/command-ssh.c (ssh_identity_register): Use a separate malloc
for PI2. Wipe PI2.
--
For whatever stupid reasons I once allocated only one memory area and
split that into PI and PI2. This is actually a common pattern with
malloc but here we used a made up object size and do not take the
extra alignment required into account. One of these not yet hit by
a (sig)bus PC/VAX hacker bugs.
Instead of trying to fix the alignment, it is better to use a second
calloc for the second struct.
GnuPG-bug-id: 2112
Signed-off-by: Werner Koch <wk@gnupg.org>
* po/Makevars (XGETTEXT_OPTIONS): Add keyword "L_".
* common/i18n.c (i18n_localegettext): New stub.
* common/i18n.h: Expand the LunderscoreIMPL macro.
* agent/agent.h (L_): New.
(LunderscoreIMPL): New.
* agent/call-pinentry.c (setup_qualitybar): Add arg ctrl anc change
caller.
* agent/findkey.c (try_unprotect_cb): Add local var ctrl.
* agent/genkey.c (check_passphrase_constraints): Replace xtryasprintf
by xtrystrdup to avoid gcc warning. Unfortinately this changes the
string.
(agent_ask_new_passphrase): Cleanup the use of initial_errtext.
--
Static strings in gpg-agent need to be translated according to the
locale set by the caller. This is required so that a gpg-agent can be
started in one locale and a gpg can be run in another. If we don't do
this the static strings (prompt, buttons) are not or in the wrong
locale translated while dynamic strings (e.g. key description) uses
the locale of gpg.
This is only the first part of the change the actual local switching
still needs to be implemented.
Debian-bug-id: 788983
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/call-pinentry.c (agent_askpin): Add args keyinfo and
cache_mode. Change all callers to pass (NULL,0) for them. Send
SETKEYINFO command.
* agent/findkey.c (unprotect): Pass the keygrip and the cache_mode for
the new args.
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (ssh_search_control_file): Check S before
upcasing it.
--
In contradiction to the comment we did not check the length of HEXGRIP
and thus the GPG_ERR_INV_LENGTH was never triggered.
Detected by Stack 0.3:
bug: anti-simplify
model: |
%cmp8 = icmp ne i32 %i.0, 40, !dbg !986
--> false
stack:
- /home/wk/s/gnupg/agent/command-ssh.c:1226:0
ncore: 2
core:
- /home/wk/s/gnupg/agent/command-ssh.c:1225:0
- buffer overflow
- /home/wk/s/gnupg/agent/command-ssh.c:1225:0
- buffer overflow
* agent/command-ssh.c (setup_ssh_env): Move code to ...
* agent/gpg-agent.c (agent_copy_startup_env): .. new function. Change
calllers.
* agent/command.c (start_command_handler): Call that fucntion for
restricted connections.
--
A remote connection is and should not be able to setup the local
session environment. However, unless --keep-display is used we would
be left without an environment and thus pinentry can't be used. The
fix is the same as used for ssh-agent connection: We use the default
environment as used at the startup of the agent.
Signed-off-by: Werner Koch <wk@gnupg.org>
--
Also fixed some of my own copyright notices due to the termination of
my assignment. The one displayed by --version is kept at FSF because
we had contributors in 2014 with FSF assignments and it gives the FSF
some visibility.
* agent/agent.h (struct pin_entry_info_s): Add fields repeat_okay and
with_repeat.
* agent/call-pinentry.c (close_button_status_cb): Rewrite and check
for PIN_REPEAT. Change users to check only the relevant bit.
(agent_askpin): Support repeat logic of new Pinentries.
* agent/command-ssh.c (ssh_identity_register): Use the new repeat
feature.
* agent/genkey.c (agent_ask_new_passphrase): Ditto.
--
If we need to confirm a passphrase entry (e.g. for new passphrase) we
set a flag into the pinentry info block. The we try to use the new
pinentry command SETREPEATERROR; if that fails, we continue as usual.
If that succeeds we ask the pinentry to show the repeat (confirmation)
prompt and on successful return we set another flag in the pinentry
info block so that the caller can skip its own confirmation check. A
new status line from the pinentry indicates that the feature is
actually supported (it may not be supported on certain systems for
example when using the ncurses backend).
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (ssh_read_key_public_from_blob): Use
es_fopenmem.
(ssh_handler_request_identities): Ditto.
(ssh_request_process): Ditto.
--
es_fopenmem is easier to understand than the more general function
es_mopen. Thus we better use the former for clarity.
* agent/command-ssh.c (ssh_key_type_spec): Add field name.
(ssh_key_types): Add human readable names.
(add_control_entry): Add arg SPEC and print key type as comment.
(ssh_identity_register): Add arg SPEC.
(ssh_handler_add_identity): Add var SPEC and pass ssh_receive_key.
* agent/command-ssh.c (SPEC_FLAG_IS_EdDSA): New.
(ssh_key_types): Add entry for ssh-ed25519.
(ssh_identifier_from_curve_name): Move to the top.
(stream_read_skip): New.
(stream_read_blob): New.
(ssh_signature_encoder_rsa): Replace MPIS array by an s-exp and move
the s-exp parsing to here.
(ssh_signature_encoder_dsa): Ditto.
(ssh_signature_encoder_ecdsa): Ditto.
(ssh_signature_encoder_eddsa): New.
(sexp_key_construct): Rewrite.
(ssh_key_extract): Rename to ...
(ssh_key_to_blob): .. this and rewrite most of it.
(ssh_receive_key): Add case for EdDSA.
(ssh_convert_key_to_blob, key_secret_to_public): Remove.
(ssh_send_key_public): Rewrite.
(ssh_handler_request_identities): Simplify.
(data_sign): Add rename args. Add new args HASH and HASHLEN. Make
use of es_fopenmen and es_fclose_snatch. Remove parsing into MPIs
which is now doe in the sgnature encoder functions.
(ssh_handler_sign_request): Take care of Ed25519.
(ssh_key_extract_comment): Rewrite using gcry_sexp_nth_string.
--
To make the code easier readable most of the Ed25591 work has been
done using a new explicit code path. Warning: Libgcrypt 1.6.1 uses a
non optimized implementation for Ed25519 and timing attacks might be
possible.
While working on the code I realized that it could need more rework;
it is at some places quite baroque and more complicated than needed.
Given that we require Libgcrypt 1.6 anyway, we should make more use of
modern Libgcrypt functions.
* agent/command-ssh.c (setup_ssh_env): Fix env setting.
--
gniibe reported this to gnupg-devel on 2012-07-04:
[...]
(2) UPDATESTARTUPTTY doesn't work to switch TTY for pinentry for
SSH.
[...]
Current implementation:
In the function start_command_handler_ssh, the logic puts
priority on ctrl->session_env which is initialized by
agent_init_default_ctrl. There are always GPG_TTY and TERM
defined, because lines around 968 in gpg-agent.c, it says:
/* Make sure that we have a default ttyname. */
While UPDATESTARTUPTTY updates opt.startup_env, it doesn't
affect at all.
Here is a patch to point the issue. Tested and works for me.
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 9f5578c29a)
* agent/gpg-agent.c [W32]: Include Several Windows header.
(opts): Change help text for enable-ssh-support.
(opts, main): Add option --enable-putty-support
(putty_support, PUTTY_IPC_MAGIC, PUTTY_IPC_MAXLEN): New for W32.
(agent_init_default_ctrl): Add and asssert call.
(putty_message_proc, putty_message_thread): New.
(handle_connections) [W32]: Start putty message thread.
* common/sysutils.c (w32_get_user_sid): New for W32 only
* tools/gpgconf-comp.c (gc_options_gpg_agent): Add
--enable-ssh-support and --enable-putty-support. Make the
configuration group visible at basic level.
* agent/command-ssh.c (serve_mmapped_ssh_request): New for W32 only.
--
This patch enables support for Putty. It has been tested with Putty
0.62 using an Unix created ssh key copied to the private-keys-v1.d
directory on Windows and with a manually crafted sshcontrol file. It
also works with a smartcard key.
May thanks to gniibe who implemented a proxy in Python to test the
putty/gpg-agent communication.
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 9f32499f99)
Resolved conflicts:
NEWS
agent/agent.h
agent/gpg-agent.c: Convert from pth to npth.
common/sysutils.c
common/sysutils.h
* agent/command-ssh.c (file_to_buffer)
(ssh_handler_request_identities): Open streams in binary mode.
(start_command_handler_ssh): Factor some code out to ..
(setup_ssh_env): new function.
--
This is for now a theoretical fix because there is no ssh client yet
which uses the GnuPG style IPC. OpenSSL for Cygwin uses only a quite
similar one. gniibe suggested to implement that IPC style in
Libassuan so that a Cygwin version of OpenSSL may be used with GnuPG.
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit ed056d67c7)
Also fixed one typo.
* agent/command.c (cmd_preset_passphrase, pinentry_loopback): Use %zu
in format string.
* scd/ccid-driver.c (ccid_get_atr): Ditto.
* agent/command-ssh.c (stream_read_string): Init arg STRING_SIZE to
avoid maybe_unitialized warning.
--
Actually the first one might have been a problem on big endian
machines.
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (struct control_file_s): Rename to
ssh_control_file_s.
(ssh_open_control_file, ssh_close_control_file)
(ssh_read_control_file, ssh_search_control_file): New.
(control_file_t): Rename and move to ...
* agent/agent.h (ssh_control_file_t): here.
* agent/command.c (do_one_keyinfo): Add args is_ssh, ttl, disabled,
and confirm. Rename unknown keytype indicator from '-' to 'X'. Extend
output.
(cmd_keyinfo): Add options --ssh-list and --with-ssh.
--
This extension allows the development of frontends to manage the
sshcontrol file.
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/command-ssh.c (SPEC_FLAG_IS_ECDSA): New.
(struct ssh_key_type_spec): Add fields CURVE_NAME and HASH_ALGO.
(ssh_key_types): Add types ecdsa-sha2-nistp{256,384,521}.
(ssh_signature_encoder_t): Add arg spec and adjust all callers.
(ssh_signature_encoder_ecdsa): New.
(sexp_key_construct, sexp_key_extract, ssh_receive_key)
(ssh_convert_key_to_blob): Support ecdsa.
(ssh_identifier_from_curve_name): New.
(ssh_send_key_public): Retrieve and pass the curve_name.
(key_secret_to_public): Ditto.
(data_sign): Add arg SPEC and change callers to pass it.
(ssh_handler_sign_request): Get the hash algo from SPEC.
* common/ssh-utils.c (get_fingerprint): Support ecdsa.
* agent/protect.c (protect_info): Add flag ECC_HACK.
(agent_protect): Allow the use of the "curve" parameter.
* agent/t-protect.c (test_agent_protect): Add a test case for ecdsa.
* agent/command-ssh.c (ssh_key_grip): Print a better error code.
--
The 3 standard curves are now supported in gpg-agent's ssh-agent
protocol implementation. I tested this with all 3 curves and keys
generated by OpenSSH 5.9p1.
Using existing non-ssh generated keys will likely fail for now. To fix
this, the code should first undergo some more cleanup; then the fixes
are pretty straightforward. And yes, the data structures are way too
complicated.
* agent/command-ssh.c: Remove dirent.h.
(control_file_s): Add struct item.
(rewind_control_file): New.
(search_control_file): Factor code out to ...
(read_control_file_item): New.
(ssh_handler_request_identities): Change to iterate over entries in
sshcontrol.
--
Formerly we scanned the private key directory for matches of entries
in sshcontrol. This patch changes it to scan the sshcontrol file and
thus considers only keys configured there. The rationale for this is
that it is common to have only a few ssh keys but many private keys.
Even if that assumption does not hold true, the scanning of the
sshcontrol file is faster than reading the directory and only then
scanning the ssh control for each directory entry.
* agent/command-ssh.c (SSH_CONTROL_FILE_NAME): New macro to replace
the direct use of the string.
(struct control_file_s, control_file_t): New.
(open_control_file, close_control_file): New. Use them instead of
using fopen/fclose directly.
The asymmetric quotes used by GNU in the past (`...') don't render
nicely on modern systems. We now use two \x27 characters ('...').
The proper solution would be to use the correct Unicode symmetric
quotes here. However this has the disadvantage that the system
requires Unicode support. We don't want that today. If Unicode is
available a generated po file can be used to output proper quotes. A
simple sed script like the one used for en@quote is sufficient to
change them.
The changes have been done by applying
sed -i "s/\`\([^'\`]*\)'/'\1'/g"
to most files and fixing obvious problems by hand. The msgid strings in
the po files were fixed with a similar command.
* command-ssh.c (card_key_available): Change wording of no key
diagnostic.
(ssh_handler_request_identities): Do not call card_key_available
if the scdaemon is disabled.
We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces. In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much. For future commits the pre-commit scripts
checks that this won't happen again.
* command-ssh.c (stream_read_string): Initialize LENGTH to zero.
(start_command_handler_ssh): Use es_fgetc/es_ungetc to check if
EOF has been reached before trying to process another request.
