diff options
| -rw-r--r-- | Documentation/technical/pack-protocol.txt | 32 | ||||
| -rw-r--r-- | builtin/receive-pack.c | 51 | ||||
| -rwxr-xr-x | t/t5534-push-signed.sh | 37 |
3 files changed, 112 insertions, 8 deletions
diff --git a/Documentation/technical/pack-protocol.txt b/Documentation/technical/pack-protocol.txt index c59ac9936a..d7358f748a 100644 --- a/Documentation/technical/pack-protocol.txt +++ b/Documentation/technical/pack-protocol.txt @@ -468,13 +468,10 @@ that it wants to update, it sends a line listing the obj-id currently on the server, the obj-id the client would like to update it to and the name of the reference. -This list is followed by a flush-pkt. Then the push options are transmitted -one per packet followed by another flush-pkt. After that the packfile that -should contain all the objects that the server will need to complete the new -references will be sent. +This list is followed by a flush-pkt. ---- - update-request = *shallow ( command-list | push-cert ) [packfile] + update-requests = *shallow ( command-list | push-cert ) shallow = PKT-LINE("shallow" SP obj-id) @@ -495,12 +492,35 @@ references will be sent. PKT-LINE("pusher" SP ident LF) PKT-LINE("pushee" SP url LF) PKT-LINE("nonce" SP nonce LF) + *PKT-LINE("push-option" SP push-option LF) PKT-LINE(LF) *PKT-LINE(command LF) *PKT-LINE(gpg-signature-lines LF) PKT-LINE("push-cert-end" LF) - packfile = "PACK" 28*(OCTET) + push-option = 1*( VCHAR | SP ) +---- + +If the server has advertised the 'push-options' capability and the client has +specified 'push-options' as part of the capability list above, the client then +sends its push options followed by a flush-pkt. + +---- + push-options = *PKT-LINE(push-option) flush-pkt +---- + +For backwards compatibility with older Git servers, if the client sends a push +cert and push options, it MUST send its push options both embedded within the +push cert and after the push cert. (Note that the push options within the cert +are prefixed, but the push options after the cert are not.) Both these lists +MUST be the same, modulo the prefix. + +After that the packfile that +should contain all the objects that the server will need to complete the new +references will be sent. + +---- + packfile = "PACK" 28*(OCTET) ---- If the receiving end does not support delete-refs, the sending end MUST diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index b618d52139..ed21142349 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -470,7 +470,8 @@ static char *prepare_push_cert_nonce(const char *path, unsigned long stamp) * after dropping "_commit" from its name and possibly moving it out * of commit.c */ -static char *find_header(const char *msg, size_t len, const char *key) +static char *find_header(const char *msg, size_t len, const char *key, + const char **next_line) { int key_len = strlen(key); const char *line = msg; @@ -483,6 +484,8 @@ static char *find_header(const char *msg, size_t len, const char *key) if (line + key_len < eol && !memcmp(line, key, key_len) && line[key_len] == ' ') { int offset = key_len + 1; + if (next_line) + *next_line = *eol ? eol + 1 : eol; return xmemdupz(line + offset, (eol - line) - offset); } line = *eol ? eol + 1 : NULL; @@ -492,7 +495,7 @@ static char *find_header(const char *msg, size_t len, const char *key) static const char *check_nonce(const char *buf, size_t len) { - char *nonce = find_header(buf, len, "nonce"); + char *nonce = find_header(buf, len, "nonce", NULL); unsigned long stamp, ostamp; char *bohmac, *expect = NULL; const char *retval = NONCE_BAD; @@ -572,6 +575,45 @@ leave: return retval; } +/* + * Return 1 if there is no push_cert or if the push options in push_cert are + * the same as those in the argument; 0 otherwise. + */ +static int check_cert_push_options(const struct string_list *push_options) +{ + const char *buf = push_cert.buf; + int len = push_cert.len; + + char *option; + const char *next_line; + int options_seen = 0; + + int retval = 1; + + if (!len) + return 1; + + while ((option = find_header(buf, len, "push-option", &next_line))) { + len -= (next_line - buf); + buf = next_line; + options_seen++; + if (options_seen > push_options->nr + || strcmp(option, + push_options->items[options_seen - 1].string)) { + retval = 0; + goto leave; + } + free(option); + } + + if (options_seen != push_options->nr) + retval = 0; + +leave: + free(option); + return retval; +} + static void prepare_push_cert_sha1(struct child_process *proc) { static int already_done; @@ -1924,6 +1966,11 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix) if (use_push_options) read_push_options(&push_options); + if (!check_cert_push_options(&push_options)) { + struct command *cmd; + for (cmd = commands; cmd; cmd = cmd->next) + cmd->error_string = "inconsistent push options"; + } prepare_shallow_info(&si, &shallow); if (!si.nr_ours && !si.nr_theirs) diff --git a/t/t5534-push-signed.sh b/t/t5534-push-signed.sh index ecb8d446a5..5bcb288f5c 100755 --- a/t/t5534-push-signed.sh +++ b/t/t5534-push-signed.sh @@ -124,6 +124,43 @@ test_expect_success GPG 'signed push sends push certificate' ' test_cmp expect dst/push-cert-status ' +test_expect_success GPG 'inconsistent push options in signed push not allowed' ' + # First, invoke receive-pack with dummy input to obtain its preamble. + prepare_dst && + git -C dst config receive.certnonceseed sekrit && + git -C dst config receive.advertisepushoptions 1 && + printf xxxx | test_might_fail git receive-pack dst >preamble && + + # Then, invoke push. Simulate a receive-pack that sends the preamble we + # obtained, followed by a dummy packet. + write_script myscript <<-\EOF && + cat preamble && + printf xxxx && + cat >push + EOF + test_might_fail git push --push-option="foo" --push-option="bar" \ + --receive-pack="\"$(pwd)/myscript\"" --signed dst --delete ff && + + # Replay the push output on a fresh dst, checking that ff is truly + # deleted. + prepare_dst && + git -C dst config receive.certnonceseed sekrit && + git -C dst config receive.advertisepushoptions 1 && + git receive-pack dst <push && + test_must_fail git -C dst rev-parse ff && + + # Tweak the push output to make the push option outside the cert + # different, then replay it on a fresh dst, checking that ff is not + # deleted. + perl -pe "s/([^ ])bar/\$1baz/" push >push.tweak && + prepare_dst && + git -C dst config receive.certnonceseed sekrit && + git -C dst config receive.advertisepushoptions 1 && + git receive-pack dst <push.tweak >out && + git -C dst rev-parse ff && + grep "inconsistent push options" out +' + test_expect_success GPG 'fail without key and heed user.signingkey' ' prepare_dst && mkdir -p dst/.git/hooks && |