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Commit | Line | Data |
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2f47eae2 | 1 | #include "cache.h" |
b2141fc1 | 2 | #include "config.h" |
2f47eae2 JH |
3 | #include "run-command.h" |
4 | #include "strbuf.h" | |
5 | #include "gpg-interface.h" | |
6 | #include "sigchain.h" | |
4322353b | 7 | #include "tempfile.h" |
2f47eae2 JH |
8 | |
9 | static char *configured_signing_key; | |
58af57e1 HS |
10 | struct gpg_format { |
11 | const char *name; | |
12 | const char *program; | |
13 | const char **verify_args; | |
14 | const char **sigs; | |
15 | }; | |
16 | ||
17 | static const char *openpgp_verify_args[] = { | |
18 | "--keyid-format=long", | |
19 | NULL | |
20 | }; | |
21 | static const char *openpgp_sigs[] = { | |
22 | "-----BEGIN PGP SIGNATURE-----", | |
23 | "-----BEGIN PGP MESSAGE-----", | |
24 | NULL | |
25 | }; | |
26 | ||
1e7adb97 HS |
27 | static const char *x509_verify_args[] = { |
28 | NULL | |
29 | }; | |
30 | static const char *x509_sigs[] = { | |
31 | "-----BEGIN SIGNED MESSAGE-----", | |
32 | NULL | |
33 | }; | |
34 | ||
58af57e1 HS |
35 | static struct gpg_format gpg_format[] = { |
36 | { .name = "openpgp", .program = "gpg", | |
37 | .verify_args = openpgp_verify_args, | |
38 | .sigs = openpgp_sigs | |
39 | }, | |
1e7adb97 HS |
40 | { .name = "x509", .program = "gpgsm", |
41 | .verify_args = x509_verify_args, | |
42 | .sigs = x509_sigs | |
43 | }, | |
58af57e1 HS |
44 | }; |
45 | ||
46 | static struct gpg_format *use_format = &gpg_format[0]; | |
2f47eae2 | 47 | |
58af57e1 HS |
48 | static struct gpg_format *get_format_by_name(const char *str) |
49 | { | |
50 | int i; | |
51 | ||
52 | for (i = 0; i < ARRAY_SIZE(gpg_format); i++) | |
53 | if (!strcmp(gpg_format[i].name, str)) | |
54 | return gpg_format + i; | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | static struct gpg_format *get_format_by_sig(const char *sig) | |
59 | { | |
60 | int i, j; | |
61 | ||
62 | for (i = 0; i < ARRAY_SIZE(gpg_format); i++) | |
63 | for (j = 0; gpg_format[i].sigs[j]; j++) | |
64 | if (starts_with(sig, gpg_format[i].sigs[j])) | |
65 | return gpg_format + i; | |
66 | return NULL; | |
67 | } | |
d7c67668 | 68 | |
01e57b5d MG |
69 | void signature_check_clear(struct signature_check *sigc) |
70 | { | |
88ce3ef6 ÆAB |
71 | FREE_AND_NULL(sigc->payload); |
72 | FREE_AND_NULL(sigc->gpg_output); | |
73 | FREE_AND_NULL(sigc->gpg_status); | |
74 | FREE_AND_NULL(sigc->signer); | |
75 | FREE_AND_NULL(sigc->key); | |
3daaaabe | 76 | FREE_AND_NULL(sigc->fingerprint); |
4de9394d | 77 | FREE_AND_NULL(sigc->primary_key_fingerprint); |
01e57b5d MG |
78 | } |
79 | ||
da6cf1b3 MG |
80 | /* An exclusive status -- only one of them can appear in output */ |
81 | #define GPG_STATUS_EXCLUSIVE (1<<0) | |
0b11a84e MG |
82 | /* The status includes key identifier */ |
83 | #define GPG_STATUS_KEYID (1<<1) | |
84 | /* The status includes user identifier */ | |
85 | #define GPG_STATUS_UID (1<<2) | |
3daaaabe MG |
86 | /* The status includes key fingerprints */ |
87 | #define GPG_STATUS_FINGERPRINT (1<<3) | |
0b11a84e MG |
88 | |
89 | /* Short-hand for standard exclusive *SIG status with keyid & UID */ | |
90 | #define GPG_STATUS_STDSIG (GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID|GPG_STATUS_UID) | |
da6cf1b3 | 91 | |
a50e7ca3 JH |
92 | static struct { |
93 | char result; | |
94 | const char *check; | |
da6cf1b3 | 95 | unsigned int flags; |
a50e7ca3 | 96 | } sigcheck_gpg_status[] = { |
0b11a84e MG |
97 | { 'G', "GOODSIG ", GPG_STATUS_STDSIG }, |
98 | { 'B', "BADSIG ", GPG_STATUS_STDSIG }, | |
da6cf1b3 MG |
99 | { 'U', "TRUST_NEVER", 0 }, |
100 | { 'U', "TRUST_UNDEFINED", 0 }, | |
0b11a84e MG |
101 | { 'E', "ERRSIG ", GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID }, |
102 | { 'X', "EXPSIG ", GPG_STATUS_STDSIG }, | |
103 | { 'Y', "EXPKEYSIG ", GPG_STATUS_STDSIG }, | |
104 | { 'R', "REVKEYSIG ", GPG_STATUS_STDSIG }, | |
3daaaabe | 105 | { 0, "VALIDSIG ", GPG_STATUS_FINGERPRINT }, |
a50e7ca3 JH |
106 | }; |
107 | ||
fbd0f166 | 108 | static void parse_gpg_output(struct signature_check *sigc) |
a50e7ca3 JH |
109 | { |
110 | const char *buf = sigc->gpg_status; | |
da6cf1b3 | 111 | const char *line, *next; |
4de9394d | 112 | int i, j; |
da6cf1b3 MG |
113 | int seen_exclusive_status = 0; |
114 | ||
115 | /* Iterate over all lines */ | |
116 | for (line = buf; *line; line = strchrnul(line+1, '\n')) { | |
117 | while (*line == '\n') | |
118 | line++; | |
119 | /* Skip lines that don't start with GNUPG status */ | |
120 | if (!skip_prefix(line, "[GNUPG:] ", &line)) | |
121 | continue; | |
122 | ||
123 | /* Iterate over all search strings */ | |
124 | for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) { | |
125 | if (skip_prefix(line, sigcheck_gpg_status[i].check, &line)) { | |
126 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_EXCLUSIVE) { | |
02561896 | 127 | if (seen_exclusive_status++) |
da6cf1b3 MG |
128 | goto found_duplicate_status; |
129 | } | |
130 | ||
3daaaabe MG |
131 | if (sigcheck_gpg_status[i].result) |
132 | sigc->result = sigcheck_gpg_status[i].result; | |
0b11a84e MG |
133 | /* Do we have key information? */ |
134 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_KEYID) { | |
da6cf1b3 MG |
135 | next = strchrnul(line, ' '); |
136 | free(sigc->key); | |
137 | sigc->key = xmemdupz(line, next - line); | |
0b11a84e MG |
138 | /* Do we have signer information? */ |
139 | if (*next && (sigcheck_gpg_status[i].flags & GPG_STATUS_UID)) { | |
da6cf1b3 MG |
140 | line = next + 1; |
141 | next = strchrnul(line, '\n'); | |
142 | free(sigc->signer); | |
143 | sigc->signer = xmemdupz(line, next - line); | |
144 | } | |
145 | } | |
3daaaabe MG |
146 | /* Do we have fingerprint? */ |
147 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_FINGERPRINT) { | |
148 | next = strchrnul(line, ' '); | |
149 | free(sigc->fingerprint); | |
150 | sigc->fingerprint = xmemdupz(line, next - line); | |
4de9394d MG |
151 | |
152 | /* Skip interim fields */ | |
153 | for (j = 9; j > 0; j--) { | |
154 | if (!*next) | |
155 | break; | |
156 | line = next + 1; | |
157 | next = strchrnul(line, ' '); | |
158 | } | |
159 | ||
160 | next = strchrnul(line, '\n'); | |
161 | free(sigc->primary_key_fingerprint); | |
162 | sigc->primary_key_fingerprint = xmemdupz(line, next - line); | |
3daaaabe | 163 | } |
da6cf1b3 MG |
164 | |
165 | break; | |
661a1806 | 166 | } |
a50e7ca3 JH |
167 | } |
168 | } | |
da6cf1b3 MG |
169 | return; |
170 | ||
171 | found_duplicate_status: | |
172 | /* | |
173 | * GOODSIG, BADSIG etc. can occur only once for each signature. | |
174 | * Therefore, if we had more than one then we're dealing with multiple | |
175 | * signatures. We don't support them currently, and they're rather | |
176 | * hard to create, so something is likely fishy and we should reject | |
177 | * them altogether. | |
178 | */ | |
179 | sigc->result = 'E'; | |
180 | /* Clear partial data to avoid confusion */ | |
4de9394d | 181 | FREE_AND_NULL(sigc->primary_key_fingerprint); |
3daaaabe | 182 | FREE_AND_NULL(sigc->fingerprint); |
da6cf1b3 MG |
183 | FREE_AND_NULL(sigc->signer); |
184 | FREE_AND_NULL(sigc->key); | |
a50e7ca3 JH |
185 | } |
186 | ||
434060ec | 187 | int check_signature(const char *payload, size_t plen, const char *signature, |
a4cc18f2 | 188 | size_t slen, struct signature_check *sigc) |
189 | { | |
190 | struct strbuf gpg_output = STRBUF_INIT; | |
191 | struct strbuf gpg_status = STRBUF_INIT; | |
192 | int status; | |
193 | ||
194 | sigc->result = 'N'; | |
195 | ||
196 | status = verify_signed_buffer(payload, plen, signature, slen, | |
197 | &gpg_output, &gpg_status); | |
198 | if (status && !gpg_output.len) | |
199 | goto out; | |
200 | sigc->payload = xmemdupz(payload, plen); | |
201 | sigc->gpg_output = strbuf_detach(&gpg_output, NULL); | |
202 | sigc->gpg_status = strbuf_detach(&gpg_status, NULL); | |
203 | parse_gpg_output(sigc); | |
4e5dc9ca | 204 | status |= sigc->result != 'G' && sigc->result != 'U'; |
a4cc18f2 | 205 | |
206 | out: | |
207 | strbuf_release(&gpg_status); | |
208 | strbuf_release(&gpg_output); | |
434060ec | 209 | |
4e5dc9ca | 210 | return !!status; |
a4cc18f2 | 211 | } |
212 | ||
ca194d50 | 213 | void print_signature_buffer(const struct signature_check *sigc, unsigned flags) |
214 | { | |
aeff29dd | 215 | const char *output = flags & GPG_VERIFY_RAW ? |
216 | sigc->gpg_status : sigc->gpg_output; | |
217 | ||
ca194d50 | 218 | if (flags & GPG_VERIFY_VERBOSE && sigc->payload) |
219 | fputs(sigc->payload, stdout); | |
220 | ||
aeff29dd | 221 | if (output) |
222 | fputs(output, stderr); | |
ca194d50 | 223 | } |
224 | ||
e6fa6cde | 225 | size_t parse_signature(const char *buf, size_t size) |
d7c67668 | 226 | { |
d7c67668 | 227 | size_t len = 0; |
8b44b2be JK |
228 | size_t match = size; |
229 | while (len < size) { | |
230 | const char *eol; | |
231 | ||
58af57e1 | 232 | if (get_format_by_sig(buf + len)) |
8b44b2be JK |
233 | match = len; |
234 | ||
235 | eol = memchr(buf + len, '\n', size - len); | |
d7c67668 JH |
236 | len += eol ? eol - (buf + len) + 1 : size - len; |
237 | } | |
8b44b2be | 238 | return match; |
d7c67668 JH |
239 | } |
240 | ||
2f47eae2 JH |
241 | void set_signing_key(const char *key) |
242 | { | |
243 | free(configured_signing_key); | |
244 | configured_signing_key = xstrdup(key); | |
245 | } | |
246 | ||
247 | int git_gpg_config(const char *var, const char *value, void *cb) | |
248 | { | |
58af57e1 HS |
249 | struct gpg_format *fmt = NULL; |
250 | char *fmtname = NULL; | |
251 | ||
2f47eae2 | 252 | if (!strcmp(var, "user.signingkey")) { |
1b0eeec3 JK |
253 | if (!value) |
254 | return config_error_nonbool(var); | |
0c5e70f0 | 255 | set_signing_key(value); |
1b0eeec3 | 256 | return 0; |
0c5e70f0 | 257 | } |
1b0eeec3 | 258 | |
57a8dd75 HS |
259 | if (!strcmp(var, "gpg.format")) { |
260 | if (!value) | |
261 | return config_error_nonbool(var); | |
58af57e1 HS |
262 | fmt = get_format_by_name(value); |
263 | if (!fmt) | |
57a8dd75 HS |
264 | return error("unsupported value for %s: %s", |
265 | var, value); | |
58af57e1 HS |
266 | use_format = fmt; |
267 | return 0; | |
57a8dd75 HS |
268 | } |
269 | ||
b02f51b1 | 270 | if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program")) |
58af57e1 HS |
271 | fmtname = "openpgp"; |
272 | ||
1e7adb97 HS |
273 | if (!strcmp(var, "gpg.x509.program")) |
274 | fmtname = "x509"; | |
275 | ||
58af57e1 HS |
276 | if (fmtname) { |
277 | fmt = get_format_by_name(fmtname); | |
278 | return git_config_string(&fmt->program, var, value); | |
2f47eae2 | 279 | } |
1b0eeec3 | 280 | |
2f47eae2 JH |
281 | return 0; |
282 | } | |
283 | ||
284 | const char *get_signing_key(void) | |
285 | { | |
286 | if (configured_signing_key) | |
287 | return configured_signing_key; | |
f9bc573f | 288 | return git_committer_info(IDENT_STRICT|IDENT_NO_DATE); |
2f47eae2 JH |
289 | } |
290 | ||
2f47eae2 JH |
291 | int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key) |
292 | { | |
d3180279 | 293 | struct child_process gpg = CHILD_PROCESS_INIT; |
0581b546 | 294 | int ret; |
2f47eae2 | 295 | size_t i, j, bottom; |
efee9553 | 296 | struct strbuf gpg_status = STRBUF_INIT; |
2f47eae2 | 297 | |
aedb5dc3 | 298 | argv_array_pushl(&gpg.args, |
58af57e1 | 299 | use_format->program, |
efee9553 | 300 | "--status-fd=2", |
aedb5dc3 JK |
301 | "-bsau", signing_key, |
302 | NULL); | |
2f47eae2 | 303 | |
0581b546 | 304 | bottom = signature->len; |
2f47eae2 JH |
305 | |
306 | /* | |
307 | * When the username signingkey is bad, program could be terminated | |
308 | * because gpg exits without reading and then write gets SIGPIPE. | |
309 | */ | |
310 | sigchain_push(SIGPIPE, SIG_IGN); | |
0581b546 | 311 | ret = pipe_command(&gpg, buffer->buf, buffer->len, |
efee9553 | 312 | signature, 1024, &gpg_status, 0); |
2f47eae2 JH |
313 | sigchain_pop(SIGPIPE); |
314 | ||
efee9553 MG |
315 | ret |= !strstr(gpg_status.buf, "\n[GNUPG:] SIG_CREATED "); |
316 | strbuf_release(&gpg_status); | |
317 | if (ret) | |
2f47eae2 JH |
318 | return error(_("gpg failed to sign the data")); |
319 | ||
320 | /* Strip CR from the line endings, in case we are on Windows. */ | |
321 | for (i = j = bottom; i < signature->len; i++) | |
322 | if (signature->buf[i] != '\r') { | |
323 | if (i != j) | |
324 | signature->buf[j] = signature->buf[i]; | |
325 | j++; | |
326 | } | |
327 | strbuf_setlen(signature, j); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
2f47eae2 JH |
332 | int verify_signed_buffer(const char *payload, size_t payload_size, |
333 | const char *signature, size_t signature_size, | |
9cc4ac8f | 334 | struct strbuf *gpg_output, struct strbuf *gpg_status) |
2f47eae2 | 335 | { |
d3180279 | 336 | struct child_process gpg = CHILD_PROCESS_INIT; |
58af57e1 | 337 | struct gpg_format *fmt; |
076aa2cb JK |
338 | struct tempfile *temp; |
339 | int ret; | |
b60b7566 | 340 | struct strbuf buf = STRBUF_INIT; |
2f47eae2 | 341 | |
076aa2cb JK |
342 | temp = mks_tempfile_t(".git_vtag_tmpXXXXXX"); |
343 | if (!temp) | |
4322353b | 344 | return error_errno(_("could not create temporary file")); |
076aa2cb JK |
345 | if (write_in_full(temp->fd, signature, signature_size) < 0 || |
346 | close_tempfile_gently(temp) < 0) { | |
4322353b | 347 | error_errno(_("failed writing detached signature to '%s'"), |
076aa2cb | 348 | temp->filename.buf); |
4322353b JK |
349 | delete_tempfile(&temp); |
350 | return -1; | |
351 | } | |
2f47eae2 | 352 | |
58af57e1 HS |
353 | fmt = get_format_by_sig(signature); |
354 | if (!fmt) | |
355 | BUG("bad signature '%s'", signature); | |
356 | ||
357 | argv_array_push(&gpg.args, fmt->program); | |
358 | argv_array_pushv(&gpg.args, fmt->verify_args); | |
aedb5dc3 | 359 | argv_array_pushl(&gpg.args, |
aedb5dc3 | 360 | "--status-fd=1", |
076aa2cb | 361 | "--verify", temp->filename.buf, "-", |
aedb5dc3 | 362 | NULL); |
2f47eae2 | 363 | |
c752fcc8 JK |
364 | if (!gpg_status) |
365 | gpg_status = &buf; | |
b60b7566 | 366 | |
0d2b664e JK |
367 | sigchain_push(SIGPIPE, SIG_IGN); |
368 | ret = pipe_command(&gpg, payload, payload_size, | |
369 | gpg_status, 0, gpg_output, 0); | |
d281b45d | 370 | sigchain_pop(SIGPIPE); |
2f47eae2 | 371 | |
4322353b | 372 | delete_tempfile(&temp); |
2f47eae2 | 373 | |
c752fcc8 | 374 | ret |= !strstr(gpg_status->buf, "\n[GNUPG:] GOODSIG "); |
9cc4ac8f | 375 | strbuf_release(&buf); /* no matter it was used or not */ |
b60b7566 | 376 | |
2f47eae2 JH |
377 | return ret; |
378 | } |