git merge/pull:
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.
pretty printing:
Tell about an "untrusted good signature" in addition to the previous
"good signature" and "bad signature". In case of a missing signature,
expand the pretty format string "%G?" to "N" in since this eases the
wirting of anything parsing git-log output.
Signed-off-by: Sebastian Götte <jaseg@xxxxxxxxxxxxxxxxxxxxxxxx>
---
I moved the commit signature verification code from pretty.c to commit.c
because it is used from pretty.c and builtin/merge.c. I include that pretty
printing change here because I needed to add the good/untrusted check for the
merge --verify-signatures option to really make sense.
Those new %G? options are implicitly tested by t7612-merge-verify-signatures.sh
because %G? is just replaced by the passed-through output of the commit
verification function.
Documentation/merge-options.txt | 4 +++
Documentation/pretty-formats.txt | 2 +-
builtin/merge.c | 33 +++++++++++++++++-
commit.c | 55 +++++++++++++++++++++++++++++
commit.h | 9 +++++
git-pull.sh | 10 ++++--
gpg-interface.h | 6 ++++
pretty.c | 69 ++++---------------------------------
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 | 61 ++++++++++++++++++++++++++++++++
13 files changed, 183 insertions(+), 66 deletions(-)
diff --git a/Documentation/merge-options.txt b/Documentation/merge-options.txt
index 0bcbe0a..2f76ab5 100644
--- a/Documentation/merge-options.txt
+++ b/Documentation/merge-options.txt
@@ -83,6 +83,10 @@ option can be used to override --squash.
Pass merge strategy specific option through to the merge
strategy.
+--verify-signatures::
+--no-verify-signatures::
+ Verify that the commits being merged have good trusted GPG signatures
+
--summary::
--no-summary::
Synonyms to --stat and --no-stat; these are deprecated and will be
diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 105f18a..7297b1b 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -131,7 +131,7 @@ The placeholders are:
- '%B': raw body (unwrapped subject and body)
- '%N': commit notes
- '%GG': raw verification message from GPG for a signed commit
-- '%G?': show either "G" for Good or "B" for Bad for a signed commit
+- '%G?': show "G" for a Good signature, "B" for a Bad signature, "U" for a good, untrusted signature and "N" for no signature
- '%GS': show the name of the signer for a signed commit
- '%gD': reflog selector, e.g., `refs/stash@{1}`
- '%gd': shortened reflog selector, e.g., `stash@{1}`
diff --git a/builtin/merge.c b/builtin/merge.c
index 7c8922c..37ece3d 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 = 0;
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_BOOLEAN(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 +1235,35 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
usage_with_options(builtin_merge_usage,
builtin_merge_options);
+ if (verify_signatures) {
+ //Verify the commit signatures
+ for (p = remoteheads; p; p = p->next) {
+ struct commit *commit = p->item;
+ struct signature signature;
+ signature.check_result = 0;
+
+ check_commit_signature(commit, &signature);
+
+ char hex[41];
+ strcpy(hex, find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
+ switch(signature.check_result){
+ case 'G':
+ if (verbosity >= 0)
+ printf(_("Commit %s has a good GPG signature by %s\n"), hex, signature.signer);
+ break;
+ case 'U':
+ die(_("Commmit %s has a good GPG signature allegedly by %s, albeit from an untrusted key."), hex, signature.signer);
+ case 'B':
+ die(_("Commmit %s has a bad GPG signature allegedly by %s."), hex, signature.signer);
+ default: //'N'
+ die(_("Commmit %s does not have a good GPG signature. In fact, commit %s does not have a GPG signature at all."), hex, hex);
+ }
+
+ free(signature.gpg_output);
+ free(signature.signer);
+ }
+ }
+
strbuf_addstr(&buf, "merge");
for (p = remoteheads; p; p = p->next)
strbuf_addf(&buf, " %s", merge_remote_util(p->item)->name);
diff --git a/commit.c b/commit.c
index e8eb0ae..300cf98 100644
--- a/commit.c
+++ b/commit.c
@@ -1023,6 +1023,61 @@ free_return:
free(buf);
}
+static struct {
+ char result;
+ const char *check;
+} signature_check[] = {
+ { 'U', ": WARNING: This key is not certified with a trusted signature!" },
+ { 'G', ": Good signature from " },
+ { 'B', ": BAD signature from " },
+};
+
+static void parse_signature_lines(struct signature *sig)
+{
+ const char *buf = sig->gpg_output;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(signature_check); i++) {
+ const char *found = strstr(buf, signature_check[i].check);
+ const char *next;
+ if (!found)
+ continue;
+ sig->check_result = signature_check[i].result;
+ found += strlen(signature_check[i].check);
+ next = strchrnul(found, '\n');
+ sig->signer = xmemdupz(found, next - found);
+ break;
+ }
+}
+
+void check_commit_signature(const struct commit* commit, struct signature *sig)
+{
+ struct strbuf payload = STRBUF_INIT;
+ struct strbuf signature = STRBUF_INIT;
+ struct strbuf gpg_output = STRBUF_INIT;
+ int status;
+
+ sig->check_result = 'N';
+
+ if (parse_signed_commit(commit->object.sha1,
+ &payload, &signature) <= 0)
+ goto out;
+ status = verify_signed_buffer(payload.buf, payload.len,
+ signature.buf, signature.len,
+ &gpg_output);
+ if (status && !gpg_output.len)
+ goto out;
+ sig->gpg_output = strbuf_detach(&gpg_output, NULL);
+ parse_signature_lines(sig);
+
+ out:
+ strbuf_release(&gpg_output);
+ strbuf_release(&payload);
+ strbuf_release(&signature);
+}
+
+
+
void append_merge_tag_headers(struct commit_list *parents,
struct commit_extra_header ***tail)
{
diff --git a/commit.h b/commit.h
index 4138bb4..2189eb6 100644
--- a/commit.h
+++ b/commit.h
@@ -5,6 +5,7 @@
#include "tree.h"
#include "strbuf.h"
#include "decorate.h"
+#include "gpg-interface.h"
struct commit_list {
struct commit *item;
@@ -230,4 +231,12 @@ extern void print_commit_list(struct commit_list *list,
const char *format_cur,
const char *format_last);
+/*
+ * 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 and sig->signer.
+ */
+extern void check_commit_signature(const struct commit* commit, struct signature *sig);
+
#endif /* COMMIT_H */
diff --git a/git-pull.sh b/git-pull.sh
index 266e682..705940d 100755
--- a/git-pull.sh
+++ b/git-pull.sh
@@ -39,7 +39,7 @@ test -z "$(git ls-files -u)" || die_conflict
test -f "$GIT_DIR/MERGE_HEAD" && die_merge
strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
-log_arg= verbosity= progress= recurse_submodules=
+log_arg= verbosity= progress= recurse_submodules= verify_signatures=
merge_args= edit=
curr_branch=$(git symbolic-ref -q HEAD)
curr_branch_short="${curr_branch#refs/heads/}"
@@ -125,6 +125,12 @@ do
--no-recurse-submodules)
recurse_submodules=--no-recurse-submodules
;;
+ --verify-signatures)
+ verify_signatures=--verify-signatures
+ ;;
+ --no-verify-signatures)
+ verify_signatures=--no-verify-signatures
+ ;;
--d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
dry_run=--dry-run
;;
@@ -283,7 +289,7 @@ true)
eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
;;
*)
- eval="git-merge $diffstat $no_commit $edit $squash $no_ff $ff_only"
+ eval="git-merge $diffstat $no_commit $verify_signatures $edit $squash $no_ff $ff_only"
eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
eval="$eval \"\$merge_name\" HEAD $merge_head"
;;
diff --git a/gpg-interface.h b/gpg-interface.h
index b9c3608..3895b2f 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -1,6 +1,12 @@
#ifndef GPG_INTERFACE_H
#define GPG_INTERFACE_H
+struct signature {
+ char *gpg_output;
+ char check_result; // 0 (not checked), N (checked but no further result), U (untrusted, good), G (good) or B (bad)
+ char *signer;
+};
+
extern int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key);
extern int verify_signed_buffer(const char *payload, size_t payload_size, const char *signature, size_t signature_size, struct strbuf *gpg_output);
extern int git_gpg_config(const char *, const char *, void *);
diff --git a/pretty.c b/pretty.c
index eae57ad..875a1db 100644
--- a/pretty.c
+++ b/pretty.c
@@ -756,12 +756,7 @@ struct format_commit_context {
const struct pretty_print_context *pretty_ctx;
unsigned commit_header_parsed:1;
unsigned commit_message_parsed:1;
- unsigned commit_signature_parsed:1;
- struct {
- char *gpg_output;
- char good_bad;
- char *signer;
- } signature;
+ struct signature signature;
char *message;
size_t width, indent1, indent2;
@@ -944,58 +939,6 @@ static void rewrap_message_tail(struct strbuf *sb,
c->indent2 = new_indent2;
}
-static struct {
- char result;
- const char *check;
-} signature_check[] = {
- { 'G', ": Good signature from " },
- { 'B', ": BAD signature from " },
-};
-
-static void parse_signature_lines(struct format_commit_context *ctx)
-{
- const char *buf = ctx->signature.gpg_output;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(signature_check); i++) {
- const char *found = strstr(buf, signature_check[i].check);
- const char *next;
- if (!found)
- continue;
- ctx->signature.good_bad = signature_check[i].result;
- found += strlen(signature_check[i].check);
- next = strchrnul(found, '\n');
- ctx->signature.signer = xmemdupz(found, next - found);
- break;
- }
-}
-
-static void parse_commit_signature(struct format_commit_context *ctx)
-{
- struct strbuf payload = STRBUF_INIT;
- struct strbuf signature = STRBUF_INIT;
- struct strbuf gpg_output = STRBUF_INIT;
- int status;
-
- ctx->commit_signature_parsed = 1;
-
- if (parse_signed_commit(ctx->commit->object.sha1,
- &payload, &signature) <= 0)
- goto out;
- status = verify_signed_buffer(payload.buf, payload.len,
- signature.buf, signature.len,
- &gpg_output);
- if (status && !gpg_output.len)
- goto out;
- ctx->signature.gpg_output = strbuf_detach(&gpg_output, NULL);
- parse_signature_lines(ctx);
-
- out:
- strbuf_release(&gpg_output);
- strbuf_release(&payload);
- strbuf_release(&signature);
-}
-
static int format_reflog_person(struct strbuf *sb,
char part,
@@ -1182,18 +1125,20 @@ static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
}
if (placeholder[0] == 'G') {
- if (!c->commit_signature_parsed)
- parse_commit_signature(c);
+ if (!c->signature.check_result)
+ check_commit_signature(c->commit, &(c->signature));
switch (placeholder[1]) {
case 'G':
if (c->signature.gpg_output)
strbuf_addstr(sb, c->signature.gpg_output);
break;
case '?':
- switch (c->signature.good_bad) {
+ switch (c->signature.check_result) {
case 'G':
case 'B':
- strbuf_addch(sb, c->signature.good_bad);
+ case 'U':
+ case 'N':
+ strbuf_addch(sb, c->signature.check_result);
}
break;
case 'S':
diff --git a/t/lib-gpg/pubring.gpg b/t/lib-gpg/pubring.gpg
index 83855fa4e1c6c37afe550c17afa1e7971042ded5..1a3c2d487c2fda9169751a3068fa51e853a1e519 100644
GIT binary patch
delta 1212
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delta 7
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diff --git a/t/lib-gpg/random_seed b/t/lib-gpg/random_seed
index 8fed1339ed0a744e5663f4a5e6b6ac9bae3d8524..95d249f15fce980f0e8c1a8a18b085b3885708aa 100644
GIT binary patch
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diff --git a/t/lib-gpg/secring.gpg b/t/lib-gpg/secring.gpg
index d831cd9eb3eee613d3c0e1a71093ae01ea7347e3..82dca8f80bf170fde5705862c3eeb9d994725042 100644
GIT binary patch
delta 2524
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delta 7
OcmbOxdzEv;RTcmY+5;N^
diff --git a/t/lib-gpg/trustdb.gpg b/t/lib-gpg/trustdb.gpg
index abace962b8bf84be688a6f27e4ebd0ee7052f210..4879ae9a84650a93a4d15bd6560c5d1b89eb4c2f 100644
GIT binary patch
delta 133
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delta 52
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ADF6Tf
diff --git a/t/t7612-merge-verify-signatures.sh b/t/t7612-merge-verify-signatures.sh
new file mode 100755
index 0000000..47a4f80
--- /dev/null
+++ b/t/t7612-merge-verify-signatures.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+test_description='merge signature verification tests'
+. ./test-lib.sh
+. "$TEST_DIRECTORY/lib-gpg.sh"
+
+test_expect_success GPG 'create signed commits' '
+ echo 1 >file && git add file &&
+ test_tick && git commit -m initial &&
+ git tag initial &&
+
+ git checkout -b side-signed &&
+ echo 3 >elif && git add elif &&
+ test_tick && git commit -S -m "signed on side" &&
+ git checkout initial &&
+
+ git checkout -b side-unsigned &&
+ echo 3 >foo && git add foo &&
+ test_tick && git commit -m "unsigned on side" &&
+ git checkout initial &&
+
+ git checkout -b side-bad &&
+ echo 3 >bar && git add bar &&
+ test_tick && git commit -S -m "bad on side" &&
+ git cat-file commit side-bad >raw &&
+ sed -e "s/bad/forged bad/" raw >forged &&
+ 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
+'
+
+test_expect_success GPG 'merge unsigned commit with verification' '
+ test_must_fail git merge --ff-only --verify-signatures side-unsigned 2> mergeerror &&
+ grep "does not have a GPG signature" mergeerror
+'
+
+test_expect_success GPG 'merge commit with bad signature with verification' '
+ test_must_fail git merge --ff-only --verify-signatures $(cat forged.commit) 2> mergeerror &&
+ grep "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 &&
+ grep "from an untrusted key" mergeerror
+'
+
+test_expect_success GPG 'merge signed commit with verification' '
+ git merge -v --ff-only --verify-signatures side-signed > mergeoutput &&
+ grep "has a good GPG signature" mergeoutput
+'
+
+test_expect_success GPG 'merge commit with bad signature without verification' '
+ git merge $(cat forged.commit)
+'
+
+test_done
--
1.8.1.5
--
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