* src/gpgme.h.in (GPGME_ENCRYPT_WRAP): New const.
(gpgme_decrypt_flags_t): New enum.
(GPGME_DECRYPT_VERIFY): New const
(GPGME_DECRYPT_UNWRAP): New const
(gpgme_op_decrypt_ext_start): New func.
(gpgme_op_decrypt_ext): New func.
* src/decrypt-verify.c (gpgme_op_decrypt_ext_start): New.
(gpgme_op_decrypt_ext): New.
(decrypt_verify_start): Add arg FLAGS. Replace call to
engine_op_decrypt_verify by the plain decrypt with the flag set.
(gpgme_op_decrypt_verify_start): Pass the flag.
(gpgme_op_decrypt_verify): Pass the flag.
* src/decrypt.c (decrypt_start): Rename to ...
(_gpgme_decrypt_start): this. Add arg FLAGS. Pass FLAGS to
engine_op_decrypt.
(gpgme_op_decrypt_start): Adjust for chnage pass 0 for FLAG.
(gpgme_op_decrypt_start): Ditto.
* src/engine.c (_gpgme_engine_op_decrypt_verify): Remove.
(_gpgme_engine_op_decrypt): Add arg FLAGS.
* src/gpgme.def, src/libgpgme.vers: Add new functions.
* src/engine-backend.h (struct engine_ops): Remove member
'decrypt_verify'. Add FLAGS to 'decrypt'. Adjust all initialization.
* src/engine-uiserver.c (uiserver_decrypt): Remove.
(uiserver_decrypt_verify): Remove.
(_uiserver_decrypt): Rename to ...
(uiserver_decrypt): this. Replace arg VERIFY by new arg FLAGS.
* src/engine-gpg.c (gpg_decrypt): Support GPGME_DECRYPT_UNWRAP.
(gpg_encrypt): Support GPGME_ENCRYPT_WRAP.
* tests/run-decrypt.c (main): New option --unwrap.
* tests/run-encrypt.c (main): New option --wrap.
--
Manual testing of that wrap/unwrap feature can be done this way:
./run-encrypt --verbose --key Alice /etc/motd > x
./run-decrypt --verbose --unwrap x > y
./run-encrypt --verbose --key Bob --wrap y > z
1. The message was first encrypted to Alice.
2. Alice decrypts the message receiving a valid OpenPGP message.
3. Alice encrypt that message to Bob
This will also work with encrypted and signed messages; the signature
will be kept intact during re-encryption. Requires GnuPG 2.1.12.
Signed-off-by: Werner Koch <wk@gnupg.org>
* configure.ac (vasprintf): Remove check.
* src/vasprintf.c: Remove file.
* src/util.h (vasprintf, asprintf): Remove prototypes. Replace all
calls to vasprintf and asprintf by gpgrt_vasprintf or gpgrt_asprintf.
Also take care to use gpgrt_free on the returned value.
* src/w32-util.c (_gpgme_get_gpgconf_path): Replace a gpgrt_asprintf
by _gpgme_strconcat.
(snprintf): New macro to use gpgrt_snprintf instead of the system's
standard snprintf.
Signed-off-by: Werner Koch <wk@gnupg.org>
* src/gpgme.c (gpgme_set_ctx_flag): Add flags "export-session-key" and
"override-session-key".
(gpgme_get_ctx_flag): Ditto.
(gpgme_set_export_session_keys): Remove.
(gpgme_get_export_session_keys): Remove.
* src/gpgme.def, src/libgpgme.vers: Remove them.
* src/context.h (struct gpgme_context): Add field
override_session_key.
* src/decrypt-verify.c (decrypt_verify_start): Pass
override_session_key value to the engine.
* src/decrypt.c (decrypt_start): Ditto.
* src/engine.c (_gpgme_engine_op_decrypt): Ditto.
(_gpgme_engine_op_decrypt_verify): Ditto.
* src/engine-backend.h (struct engine_ops): Extend DECRYPT and
DECRYPT_VERIFY_START with override_session_key.
* src/engine-uiserver.c (_uiserver_decrypt): Add stub arg
override_session_key.
(uiserver_decrypt): Ditto.
(uiserver_decrypt_verify): Ditto.
* src/engine-gpgsm.c (gpgsm_decrypt): Ditto.
* src/engine-gpg.c (gpg_decrypt): Add arg override_session_key and set
corresponding gpg option.
* tests/run-decrypt.c (print_result): Print the session key if
available.
(main): Add options --export-session-key and --override-session-key.
--
To keep the number of context manipulation functions at bay, this
patches removes the just added gpgme_set_export_session_keys and
gpgme_get_export_session_keys by flags for the generic context
function.
The patch also implements the --override-session-key feature.
GnuPG-bug-id: 2754
Signed-off-by: Werner Koch <wk@gnupg.org>
* src/gpgme.c (gpgme_set_export_session_keys): New function.
(gpgme_get_export_session_keys): New function.
* src/gpgme.h.in (struct _gpgme_op_decrypt_result): Add session_key
member.
(gpgme_{set,get}_export_session_keys): Declare new functions.
* src/libgpgme.vers, src/gpgme.def: Export new functions in shared
object.
* src/engine.h: (_gpgme_engine_op_decrypt) Add export_session_key
parameter.
(_gpgme_engine_op_decrypt_verify): Add export_session_key parameter.
* src/engine-backend.h: (struct engine_ops): Change function
pointer declarations to match.
* src/context.h (struct gpgme_context): Add export_session_keys member.
* src/decrypt.c (release_op_data): Free result.session_key.
(_gpgme_decrypt_status_handler): Store a copy of the exported session
key.
(decrypt_start): Pass export_session_keys from the context.
* src/decrypt-verify.c (decrypt_verify_start): Pass
export_session_keys from context.
* src/engine.c (_gpgme_engine_op_decrypt): Pass through
export_session_key flag.
(_gpgme_engine_op_decrypt_verify): Pass through export_session_key
flag.
* src/engine-gpg.c (gpg_decrypt): If export_session_key is set, add
--export-session-key to argument list.
* src/engine-gpgsm.c (gpgsm_decrypt): Ignore export_session_key for
now, since gpgsm offers no such mechanism.
* src/engine-uiserver.c (_uiserver_decrypt): If export_session_key is
set, add --export-session-key flag to cmd.
* doc/gpgme.texi: Document new functions and session_key member of
decrypt_result_t.
* doc/uiserver.texi: Add --export-session-key flag to DECRYPT command.
--
gpg(1) documents session key export as useful for key escrow, and is
rightly dubious of that use case. However, session key export is also
useful in other use cases. Two examples from MUA development (where
this functionality would be specifically useful to me right now):
* If the MUA stores a local copy of the session key upon decrypting
the message, it can re-decrypt the message without expensive
asymmetric operations. When rendering a thread with dozens of
encrypted messages, this can represent a significant speedup.
* A user may have expired encryption-capable secret key material,
along with many messages encrypted to that material. If she stores
the session keys for those messages she wants to keep, she can
destroy her secret key material and make any messages she has
deleted completely unrecoverable, even to an attacker who gets her
remaining secret keys in the future.
This patchset makes a two specific implementation decisions that could
have gone in different ways. I welcome feedback on preferred outcomes.
0) session key representation: we currently represent the session key
as an opaque textual string, rather than trying to provide any
sort of in-memory structure. While it wouldn't be hard to parse
the data produced by gpg's --export-session-key, I chose to use
the opaque string rather than lock in a particular data format.
1) API/ABI: i've added a member to gpgme_op_decrypt_result_t. This
has the potential to cause an out-of-bound memory access if
someone uses code compiled against the newer verision, but linked
at runtime against an older version. I've attempted to limit that
risk by documenting that users must verify
gpgme_get_export_session_keys() before accessing this new struct
member -- this means that code expecting this capability will
require the symbol at link-time, and will refuse to link against
older versions.
Another approach to solving this problem would be to avoid
modifying gpgme_op_decrypt_result_t, and to introduce instead a
new function gpgme_op_session_key(), which could be called in the
same places as gpgme_op_decrypt_result(). Depending on the
representation of the session key, this might introduce new
memory-management burdens on the user of the library, and the
session key is certainly part of a decryption result, so it seemed
simpler to go with what i have here.
If anyone has strong preferences that these choices should be solved
in a different way, i'm happy to hear them.
Additionally, I note that i'm also still pretty unclear about how the
"UI Server" fits into this whole ecosystem. In particular, I don't
know whether it's kosher to just add an --export-session-key flag to
the DECRYPT operation without actually having implemented it anywhere,
but i don't see where i would actually implement it either :/
If this patch (or some variant) is adopted, i will supply another
patch that permits offering a session key during decryption (e.g. "gpg
--override-session-key"), but I wanted to get these implementation
choices ironed out first.
Gnupg-Bug-Id: 2754
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
On the concern of adding a new field to a structure: It may not be
clearly documented but we don't expect that a user ever allocates such
a structure - those result structure may only be created bu gpgme and
are read-only for the user. Adding a new member constitutes a
compatible ABI change and thus an older SO may not be used by code
compiled with a header for the newer API. Unless someone tinkers with
the build system, this should never happen. We have added new fields
to result structure may times and I can't remember any problems.
- wk
* src/engine-assuan.c (llass_new): Update --ttyname from GPG_TTY.
* src/engine-g13.c (g13_new): Ditto.
* src/engine-gpg.c (gpg_new): Ditto.
* src/engine-uiserver.c (uiserver_new): Ditto.
* src/engine-gpgsm.c (gpgsm_new): Ditto.
--
Useful when no DISPLAY is set and there is no attached terminal to the
current process.
Signed-off-by: Ben Kibbey <bjk@luxsci.net>
* src/edit.c (command_handler): Handle special error code.
* src/engine-gpg.c (read_status): Ditto.
* src/engine-gpgsm.c (status_handler): Ditto.
* src/engine-uiserver.c (status_handler): Ditto.
* src/util.h (GPG_ERR_FALSE): Define for older libgpg-error versions.
--
An edit callback may now simply return GPG_ERR_FALSE to indicate that
it did not handled the status code. GPGME will the do the appropriate
action, which is to send an empty line.
Note that it is highly unlikely that GPG_ERR_FALSE has ever been used
by an application as return value from an edit interactor.
Signed-off-by: Werner Koch <wk@gnupg.org>
* src/engine.c (_gpgme_engine_info_release): Do not assert but free
FILE_NAME.
(gpgme_get_engine_info): Provide default for VERSION and REQ_VERSION.
Use calloc instead of malloc.
(_gpgme_set_engine_info): Ditto.
* src/engine-assuan.c (llass_get_version): Return NULL.
(llass_get_req_version): Ditto.
* src/engine-spawn.c (engspawn_get_version): Ditto.
(engspawn_get_req_version): Ditto.
* src/engine-uiserver.c (uiserver_get_version): Ditto.
(uiserver_get_req_version): Ditto.
Signed-off-by: Werner Koch <wk@gnupg.org>
Previously, 'gpgme_engine_check_version' failed for these protocols
because the version parser failed to parse the dummy versions.
* src/engine-assuan.c (llass_get_version): Use a version triple that
the parser can understand.
(llass_get_req_version): Likewise.
* src/engine-spawn.c (engspawn_get_version): Likewise.
(engspawn_get_req_version): Likewise.
* src/engine-uiserver.c (uiserver_get_version): Likewise.
(uiserver_get_req_version): Likewise.
Signed-off-by: Justus Winter <justus@g10code.com>
* src/gpgme.h.in (gpgme_set_ctx_flag): New prototype.
* src/gpgme.c (gpgme_set_ctx_flag): New.
* src/gpgme.def, src/libgpgme.vers: Add new function.
* src/context.h (struct gpgme_context): Add FULL_STATUS.
* src/decrypt.c (_gpgme_decrypt_status_handler): Do not call the
status callback if FULL_STATUS is set.
* src/genkey.c (genkey_status_handler): Ditto.
* src/passphrase.c (_gpgme_passphrase_status_handler): Ditto.
* src/sign.c (_gpgme_sign_status_handler): Ditto.
* src/engine-backend.h (struct engine_ops): Add SET_STATUS_CB and add
adjust all definitions of that variable.
* src/engine.c (_gpgme_engine_set_status_cb): New.
* src/op-support.c (_gpgme_op_reset): Call this function.
* src/engine-gpg.c (struct engine_gpg): Add fields MON_CB and
MON_CB_VALUE.
(gpg_set_status_cb): New.
(_gpgme_engine_ops_gpg): Register that function.
(read_status): Call the monitor callback.
* src/engine-gpgsm.c (struct engine_gpgsm): Add fields MON_CB and
MON_CB_VALUE.
(_gpgme_engine_ops_gpgsm): Register that function.
(gpgsm_assuan_simple_command): Change first arg to be an engine
context and adjust call callers. Call the monitor callback.
* src/engine-uiserver.c (struct engine_uiserver): Add fields MON_CB
and MON_CB_VALUE.
(_gpgme_engine_ops_uiserver): Register that function.
(uiserver_assuan_simple_command): Change first arg to be an engine
context and adjust call callers. Call the monitor callback.
* tests/run-verify.c (status_cb): New.
(print_result): Print algo names.
(main): Add option --status.
--
This new feature is mainly intended for bug tracking. Having access
to the raw status lines might also be useful for applications, though.
Signed-off-by: Werner Koch <wk@gnupg.org>
* src/engine-assuan.c (llass_new): Don't treat ttyname_r error as
fatal.
* src/engine-g13.c (g13_new): Likewise.
* src/engine-gpg.c (gpg_new): Likewise.
* src/engine-gpgsm.c (gpgsm_new): Likewise.
* src/engine-uiserver.c (uiserver_new): Likewise.
--
Even though isatty() returns 1, ttyname_r() may fail in many ways, e.g.,
when /dev/pts is not accessible under chroot. Since all our uses of
ttyname_r() require that the function works, we can treat the failure as
if isatty() fails.
Signed-off-by: Daiki Ueno <ueno@gnu.org>
* src/engine-gpgsm.c (status_handler):
* src/engine-uiserver.c (status_handler):
--
After a realloc (realloc is also used for initial alloc) the allocated
size if the buffer is not correctly recorded. Thus an overflow can be
introduced by receiving data with different line lengths in a specific
order. This is not easy exploitable because libassuan constructs the
line. However a crash has been reported and thus it might be possible
to constructs an exploit.
CVE-id: CVE-2014-3564
Reported-by: Tomáš Trnka
* src/util.h: Move some prototypes to ...
* src/sys-util.h: New.
* src/Makefile.am (main_sources): Add sys-util.h.
* configure.ac (AH_VERBATIM): Add DIRSEP_C and DIRSEP_S.
* src/dirinfo.c: Include sys-util.h.
(WANT_GPG_NAME, WANT_GPGSM_NAME, WANT_G13_NAME)
(WANT_UISRV_SOCKET): New.
(dirinfo): Add corresponding fields.
(parse_output): Add arg COMPONENTS and set new fields.
(read_gpgconf_dirs): Add arg components and act upon it.
(get_gpgconf_item): Call read_gpgconf_dirs two times. Add debug
output.
(_gpgme_get_default_gpg_name): New.
(_gpgme_get_default_gpgsm_name): New.
(_gpgme_get_default_g13_name): New.
(_gpgme_get_default_gpgconf_name): New.
(_gpgme_get_default_uisrv_socket): New.
* src/engine-gpg.c, src/engine-g13.c, src/engine-gpgconf.c
* src/engine-gpgsm.c, src/engine-uiserver.c: Change to use
_gpgme_get_default_ instead of those from sys-util.h.
* src/posix-util.c (_gpgme_get_gpg_path): Include sys-util.h.
(_gpgme_get_uiserver_socket_path): Remove.
* src/w32-util.c (_gpgme_get_gpg_path): Include sys-util.h.
(_gpgme_get_uiserver_socket_path): Remove.
--
The default engines names are now taken from the output of gpgconf.
If gpgconf is not installed gpg 1 is assumed and locate the same was
as gpgconf.
* configure.ac (NEED__FILE_OFFSET_BITS): Change to define gpgme_off_t
and gpgme_ssize_t.
(API__OFF_T, API__SSIZE_T): New ac_subst.
* src/gpgme.h.in: Replace all ssize_t and off_t by ac_subst macros.
* src/assuan-support.c, src/ath-pthread.c, src/ath.c, src/ath.h
* src/data-compat.c, src/data-fd.c, src/data-mem.c, src/data-stream.c
* src/data-user.c, src/data.c, src/data.h, src/engine-gpgsm.c
* src/engine-uiserver.c, src/gpgme-tool.c, src/gpgme.c: Replace off_t
by gpgme_off_t and sszie_t by gpgme_ssize_t.
* src/ath-pthread.c, src/ath.h: Include gpgme.h.
--
For a detailed description, see the gpgme.texi diff.
* src/gpgme.c (gpgme_set_pinentry_mode): New.
* src/gpgme.h.in (gpgme_pinentry_t): New.
(gpgme_set_pinentry_mode): New.
* src/context.h (struct gpgme_context): Add field pinentry_mode.
* src/engine-backend.h (struct engine_ops): Add field
set_pinentry_mode.
* src/engine-gpg.c (struct engine_gpg): Add field pinentry_mode.
(build_argv): Implement pinentry_mode.
(gpg_set_pinentry_mode): New.
(_gpgme_engine_ops_gpg): Register gpg_set_pinentry_mode.
--
Note that this new fucntion may only be used with gpg 2.1.
* src/engine-uiserver.c: Remove status-table.h which is not anymore
built. Fixes bug#1412.
--
The file was actually removed from the code by 885243e0 but for
unknown reasons the missing file was not reported by "make distcheck".
