From efed0022492b81bf59d29193c4ffe96492dd9e9b Mon Sep 17 00:00:00 2001 From: Sebastian Götte Date: Sun, 31 Mar 2013 18:02:24 +0200 Subject: merge/pull: verify GPG signatures of commits being merged MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When --verify-signatures is specified on the command-line of git-merge or git-pull, check whether the commits being merged have good gpg signatures and abort the merge in case they do not. This allows e.g. auto-deployment from untrusted repo hosts. Signed-off-by: Sebastian Götte Signed-off-by: Junio C Hamano --- builtin/merge.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'builtin/merge.c') diff --git a/builtin/merge.c b/builtin/merge.c index 7c8922c8b0..e57c42c622 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -49,7 +49,7 @@ static const char * const builtin_merge_usage[] = { static int show_diffstat = 1, shortlog_len = -1, squash; static int option_commit = 1, allow_fast_forward = 1; static int fast_forward_only, option_edit = -1; -static int allow_trivial = 1, have_message; +static int allow_trivial = 1, have_message, verify_signatures; static int overwrite_ignore = 1; static struct strbuf merge_msg = STRBUF_INIT; static struct strategy **use_strategies; @@ -199,6 +199,8 @@ static struct option builtin_merge_options[] = { OPT_BOOLEAN(0, "ff-only", &fast_forward_only, N_("abort if fast-forward is not possible")), OPT_RERERE_AUTOUPDATE(&allow_rerere_auto), + OPT_BOOL(0, "verify-signatures", &verify_signatures, + N_("Verify that the named commit has a valid GPG signature")), OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"), N_("merge strategy to use"), option_parse_strategy), OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"), @@ -1233,6 +1235,36 @@ int cmd_merge(int argc, const char **argv, const char *prefix) usage_with_options(builtin_merge_usage, builtin_merge_options); + if (verify_signatures) { + for (p = remoteheads; p; p = p->next) { + struct commit *commit = p->item; + char hex[41]; + struct signature_check signature_check; + memset(&signature_check, 0, sizeof(signature_check)); + + check_commit_signature(commit, &signature_check); + + strcpy(hex, find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV)); + switch (signature_check.result) { + case 'G': + break; + case 'B': + die(_("Commit %s has a bad GPG signature " + "allegedly by %s."), hex, signature_check.signer); + default: /* 'N' */ + die(_("Commit %s does not have a GPG signature."), hex); + } + if (verbosity >= 0 && signature_check.result == 'G') + printf(_("Commit %s has a good GPG signature by %s\n"), + hex, signature_check.signer); + + free(signature_check.gpg_output); + free(signature_check.gpg_status); + free(signature_check.signer); + free(signature_check.key); + } + } + strbuf_addstr(&buf, "merge"); for (p = remoteheads; p; p = p->next) strbuf_addf(&buf, " %s", merge_remote_util(p->item)->name); -- cgit v1.2.3 From eb307ae7bb78ccde4e2ac69f302ccf8834883628 Mon Sep 17 00:00:00 2001 From: Sebastian Götte Date: Sun, 31 Mar 2013 18:02:46 +0200 Subject: merge/pull Check for untrusted good GPG signatures MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When --verify-signatures is specified, abort the merge in case a good GPG signature from an untrusted key is encountered. Signed-off-by: Sebastian Götte Signed-off-by: Junio C Hamano --- Documentation/merge-options.txt | 4 ++-- builtin/merge.c | 3 +++ commit.c | 14 +++++++++----- commit.h | 10 +++++----- gpg-interface.h | 1 + t/lib-gpg/pubring.gpg | Bin 1164 -> 2359 bytes t/lib-gpg/random_seed | Bin 600 -> 600 bytes t/lib-gpg/secring.gpg | Bin 1237 -> 3734 bytes t/lib-gpg/trustdb.gpg | Bin 1280 -> 1360 bytes t/t7612-merge-verify-signatures.sh | 9 +++++++++ 10 files changed, 29 insertions(+), 12 deletions(-) (limited to 'builtin/merge.c') diff --git a/Documentation/merge-options.txt b/Documentation/merge-options.txt index 31f1067521..a0f022b41d 100644 --- a/Documentation/merge-options.txt +++ b/Documentation/merge-options.txt @@ -85,8 +85,8 @@ option can be used to override --squash. --verify-signatures:: --no-verify-signatures:: - Verify that the commits being merged have good GPG signatures and abort the - merge in case they do not. + Verify that the commits being merged have good and trusted GPG signatures + and abort the merge in case they do not. --summary:: --no-summary:: diff --git a/builtin/merge.c b/builtin/merge.c index e57c42c622..bac11d1605 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -1248,6 +1248,9 @@ int cmd_merge(int argc, const char **argv, const char *prefix) switch (signature_check.result) { case 'G': break; + case 'U': + die(_("Commit %s has an untrusted GPG signature, " + "allegedly by %s."), hex, signature_check.signer); case 'B': die(_("Commit %s has a bad GPG signature " "allegedly by %s."), hex, signature_check.signer); diff --git a/commit.c b/commit.c index 94029c9496..516a4ff7d2 100644 --- a/commit.c +++ b/commit.c @@ -1047,6 +1047,8 @@ static struct { } sigcheck_gpg_status[] = { { 'G', "\n[GNUPG:] GOODSIG " }, { 'B', "\n[GNUPG:] BADSIG " }, + { 'U', "\n[GNUPG:] TRUST_NEVER" }, + { 'U', "\n[GNUPG:] TRUST_UNDEFINED" }, }; static void parse_gpg_output(struct signature_check *sigc) @@ -1068,11 +1070,13 @@ static void parse_gpg_output(struct signature_check *sigc) found += strlen(sigcheck_gpg_status[i].check); } sigc->result = sigcheck_gpg_status[i].result; - sigc->key = xmemdupz(found, 16); - found += 17; - next = strchrnul(found, '\n'); - sigc->signer = xmemdupz(found, next - found); - break; + /* The trust messages are not followed by key/signer information */ + if (sigc->result != 'U') { + sigc->key = xmemdupz(found, 16); + found += 17; + next = strchrnul(found, '\n'); + sigc->signer = xmemdupz(found, next - found); + } } } diff --git a/commit.h b/commit.h index c24b844ad6..87b4b6cc0c 100644 --- a/commit.h +++ b/commit.h @@ -234,11 +234,11 @@ extern void print_commit_list(struct commit_list *list, const char *format_last); /* - * Check the signature of the given commit. The result of the check is stored in - * sig->result, 'G' for a good signature, 'B' for a bad signature and 'N' - * for no signature at all. - * This may allocate memory for sig->gpg_output, sig->gpg_status, sig->signer - * and sig->key. + * Check the signature of the given commit. The result of the check is stored + * in sig->check_result, 'G' for a good signature, 'U' for a good signature + * from an untrusted signer, 'B' for a bad signature and 'N' for no signature + * at all. This may allocate memory for sig->gpg_output, sig->gpg_status, + * sig->signer and sig->key. */ extern void check_commit_signature(const struct commit* commit, struct signature_check *sigc); diff --git a/gpg-interface.h b/gpg-interface.h index 5884aa4052..a85cb5bc97 100644 --- a/gpg-interface.h +++ b/gpg-interface.h @@ -6,6 +6,7 @@ struct signature_check { char *gpg_status; char result; /* 0 (not checked), * N (checked but no further result), + * U (untrusted good), * G (good) * B (bad) */ char *signer; diff --git a/t/lib-gpg/pubring.gpg b/t/lib-gpg/pubring.gpg index 83855fa4e1..1a3c2d487c 100644 Binary files a/t/lib-gpg/pubring.gpg and b/t/lib-gpg/pubring.gpg differ diff --git a/t/lib-gpg/random_seed b/t/lib-gpg/random_seed index 8fed1339ed..95d249f15f 100644 Binary files a/t/lib-gpg/random_seed and b/t/lib-gpg/random_seed differ diff --git a/t/lib-gpg/secring.gpg b/t/lib-gpg/secring.gpg index d831cd9eb3..82dca8f80b 100644 Binary files a/t/lib-gpg/secring.gpg and b/t/lib-gpg/secring.gpg differ diff --git a/t/lib-gpg/trustdb.gpg b/t/lib-gpg/trustdb.gpg index abace962b8..4879ae9a84 100644 Binary files a/t/lib-gpg/trustdb.gpg and b/t/lib-gpg/trustdb.gpg differ diff --git a/t/t7612-merge-verify-signatures.sh b/t/t7612-merge-verify-signatures.sh index 6ccfbf367a..21a0bf8fb8 100755 --- a/t/t7612-merge-verify-signatures.sh +++ b/t/t7612-merge-verify-signatures.sh @@ -27,6 +27,10 @@ test_expect_success GPG 'create signed commits' ' git hash-object -w -t commit forged >forged.commit && git checkout initial && + git checkout -b side-untrusted && + echo 3 >baz && git add baz && + test_tick && git commit -SB7227189 -m "untrusted on side" + git checkout master ' @@ -40,6 +44,11 @@ test_expect_success GPG 'merge commit with bad signature with verification' ' test_i18ngrep "has a bad GPG signature" mergeerror ' +test_expect_success GPG 'merge commit with untrusted signature with verification' ' + test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror && + test_i18ngrep "has an untrusted GPG signature" mergeerror +' + test_expect_success GPG 'merge signed commit with verification' ' git merge --verbose --ff-only --verify-signatures side-signed >mergeoutput && test_i18ngrep "has a good GPG signature" mergeoutput -- cgit v1.2.3