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Commit | Line | Data |
---|---|---|
2f47eae2 | 1 | #include "cache.h" |
9b27b492 | 2 | #include "commit.h" |
b2141fc1 | 3 | #include "config.h" |
2f47eae2 JH |
4 | #include "run-command.h" |
5 | #include "strbuf.h" | |
facca53a | 6 | #include "dir.h" |
2f47eae2 JH |
7 | #include "gpg-interface.h" |
8 | #include "sigchain.h" | |
4322353b | 9 | #include "tempfile.h" |
fd9e2267 | 10 | #include "alias.h" |
2f47eae2 JH |
11 | |
12 | static char *configured_signing_key; | |
facca53a | 13 | static const char *ssh_default_key_command, *ssh_allowed_signers, *ssh_revocation_file; |
54887b46 HJI |
14 | static enum signature_trust_level configured_min_trust_level = TRUST_UNDEFINED; |
15 | ||
58af57e1 HS |
16 | struct gpg_format { |
17 | const char *name; | |
18 | const char *program; | |
19 | const char **verify_args; | |
20 | const char **sigs; | |
b5726a5d | 21 | int (*verify_signed_buffer)(struct signature_check *sigc, |
02769437 FS |
22 | struct gpg_format *fmt, |
23 | const char *signature, | |
b5726a5d FS |
24 | size_t signature_size); |
25 | int (*sign_buffer)(struct strbuf *buffer, struct strbuf *signature, | |
26 | const char *signing_key); | |
fd9e2267 | 27 | const char *(*get_default_key)(void); |
4838f62c | 28 | const char *(*get_key_id)(void); |
58af57e1 HS |
29 | }; |
30 | ||
31 | static const char *openpgp_verify_args[] = { | |
32 | "--keyid-format=long", | |
33 | NULL | |
34 | }; | |
35 | static const char *openpgp_sigs[] = { | |
36 | "-----BEGIN PGP SIGNATURE-----", | |
37 | "-----BEGIN PGP MESSAGE-----", | |
38 | NULL | |
39 | }; | |
40 | ||
1e7adb97 HS |
41 | static const char *x509_verify_args[] = { |
42 | NULL | |
43 | }; | |
44 | static const char *x509_sigs[] = { | |
45 | "-----BEGIN SIGNED MESSAGE-----", | |
46 | NULL | |
47 | }; | |
48 | ||
29b31577 FS |
49 | static const char *ssh_verify_args[] = { NULL }; |
50 | static const char *ssh_sigs[] = { | |
51 | "-----BEGIN SSH SIGNATURE-----", | |
52 | NULL | |
53 | }; | |
54 | ||
b5726a5d | 55 | static int verify_gpg_signed_buffer(struct signature_check *sigc, |
02769437 FS |
56 | struct gpg_format *fmt, |
57 | const char *signature, | |
b5726a5d | 58 | size_t signature_size); |
facca53a | 59 | static int verify_ssh_signed_buffer(struct signature_check *sigc, |
02769437 FS |
60 | struct gpg_format *fmt, |
61 | const char *signature, | |
facca53a | 62 | size_t signature_size); |
b5726a5d FS |
63 | static int sign_buffer_gpg(struct strbuf *buffer, struct strbuf *signature, |
64 | const char *signing_key); | |
29b31577 FS |
65 | static int sign_buffer_ssh(struct strbuf *buffer, struct strbuf *signature, |
66 | const char *signing_key); | |
b5726a5d | 67 | |
fd9e2267 FS |
68 | static const char *get_default_ssh_signing_key(void); |
69 | ||
4838f62c FS |
70 | static const char *get_ssh_key_id(void); |
71 | ||
58af57e1 | 72 | static struct gpg_format gpg_format[] = { |
b5726a5d FS |
73 | { |
74 | .name = "openpgp", | |
75 | .program = "gpg", | |
76 | .verify_args = openpgp_verify_args, | |
77 | .sigs = openpgp_sigs, | |
78 | .verify_signed_buffer = verify_gpg_signed_buffer, | |
79 | .sign_buffer = sign_buffer_gpg, | |
fd9e2267 | 80 | .get_default_key = NULL, |
4838f62c | 81 | .get_key_id = NULL, |
58af57e1 | 82 | }, |
b5726a5d FS |
83 | { |
84 | .name = "x509", | |
85 | .program = "gpgsm", | |
86 | .verify_args = x509_verify_args, | |
87 | .sigs = x509_sigs, | |
88 | .verify_signed_buffer = verify_gpg_signed_buffer, | |
89 | .sign_buffer = sign_buffer_gpg, | |
fd9e2267 | 90 | .get_default_key = NULL, |
4838f62c | 91 | .get_key_id = NULL, |
1e7adb97 | 92 | }, |
29b31577 FS |
93 | { |
94 | .name = "ssh", | |
95 | .program = "ssh-keygen", | |
96 | .verify_args = ssh_verify_args, | |
97 | .sigs = ssh_sigs, | |
facca53a | 98 | .verify_signed_buffer = verify_ssh_signed_buffer, |
fd9e2267 FS |
99 | .sign_buffer = sign_buffer_ssh, |
100 | .get_default_key = get_default_ssh_signing_key, | |
4838f62c | 101 | .get_key_id = get_ssh_key_id, |
29b31577 | 102 | }, |
58af57e1 HS |
103 | }; |
104 | ||
105 | static struct gpg_format *use_format = &gpg_format[0]; | |
2f47eae2 | 106 | |
58af57e1 HS |
107 | static struct gpg_format *get_format_by_name(const char *str) |
108 | { | |
109 | int i; | |
110 | ||
111 | for (i = 0; i < ARRAY_SIZE(gpg_format); i++) | |
112 | if (!strcmp(gpg_format[i].name, str)) | |
113 | return gpg_format + i; | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static struct gpg_format *get_format_by_sig(const char *sig) | |
118 | { | |
119 | int i, j; | |
120 | ||
121 | for (i = 0; i < ARRAY_SIZE(gpg_format); i++) | |
122 | for (j = 0; gpg_format[i].sigs[j]; j++) | |
123 | if (starts_with(sig, gpg_format[i].sigs[j])) | |
124 | return gpg_format + i; | |
125 | return NULL; | |
126 | } | |
d7c67668 | 127 | |
01e57b5d MG |
128 | void signature_check_clear(struct signature_check *sigc) |
129 | { | |
88ce3ef6 | 130 | FREE_AND_NULL(sigc->payload); |
b5726a5d | 131 | FREE_AND_NULL(sigc->output); |
88ce3ef6 ÆAB |
132 | FREE_AND_NULL(sigc->gpg_status); |
133 | FREE_AND_NULL(sigc->signer); | |
134 | FREE_AND_NULL(sigc->key); | |
3daaaabe | 135 | FREE_AND_NULL(sigc->fingerprint); |
4de9394d | 136 | FREE_AND_NULL(sigc->primary_key_fingerprint); |
01e57b5d MG |
137 | } |
138 | ||
da6cf1b3 MG |
139 | /* An exclusive status -- only one of them can appear in output */ |
140 | #define GPG_STATUS_EXCLUSIVE (1<<0) | |
0b11a84e MG |
141 | /* The status includes key identifier */ |
142 | #define GPG_STATUS_KEYID (1<<1) | |
143 | /* The status includes user identifier */ | |
144 | #define GPG_STATUS_UID (1<<2) | |
3daaaabe MG |
145 | /* The status includes key fingerprints */ |
146 | #define GPG_STATUS_FINGERPRINT (1<<3) | |
54887b46 HJI |
147 | /* The status includes trust level */ |
148 | #define GPG_STATUS_TRUST_LEVEL (1<<4) | |
0b11a84e MG |
149 | |
150 | /* Short-hand for standard exclusive *SIG status with keyid & UID */ | |
151 | #define GPG_STATUS_STDSIG (GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID|GPG_STATUS_UID) | |
da6cf1b3 | 152 | |
a50e7ca3 JH |
153 | static struct { |
154 | char result; | |
155 | const char *check; | |
da6cf1b3 | 156 | unsigned int flags; |
a50e7ca3 | 157 | } sigcheck_gpg_status[] = { |
0b11a84e MG |
158 | { 'G', "GOODSIG ", GPG_STATUS_STDSIG }, |
159 | { 'B', "BADSIG ", GPG_STATUS_STDSIG }, | |
0b11a84e MG |
160 | { 'E', "ERRSIG ", GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID }, |
161 | { 'X', "EXPSIG ", GPG_STATUS_STDSIG }, | |
162 | { 'Y', "EXPKEYSIG ", GPG_STATUS_STDSIG }, | |
163 | { 'R', "REVKEYSIG ", GPG_STATUS_STDSIG }, | |
3daaaabe | 164 | { 0, "VALIDSIG ", GPG_STATUS_FINGERPRINT }, |
54887b46 HJI |
165 | { 0, "TRUST_", GPG_STATUS_TRUST_LEVEL }, |
166 | }; | |
167 | ||
803978da JD |
168 | /* Keep the order same as enum signature_trust_level */ |
169 | static struct sigcheck_gpg_trust_level { | |
54887b46 | 170 | const char *key; |
803978da | 171 | const char *display_key; |
54887b46 HJI |
172 | enum signature_trust_level value; |
173 | } sigcheck_gpg_trust_level[] = { | |
803978da JD |
174 | { "UNDEFINED", "undefined", TRUST_UNDEFINED }, |
175 | { "NEVER", "never", TRUST_NEVER }, | |
176 | { "MARGINAL", "marginal", TRUST_MARGINAL }, | |
177 | { "FULLY", "fully", TRUST_FULLY }, | |
178 | { "ULTIMATE", "ultimate", TRUST_ULTIMATE }, | |
a50e7ca3 JH |
179 | }; |
180 | ||
392b862e HJI |
181 | static void replace_cstring(char **field, const char *line, const char *next) |
182 | { | |
183 | free(*field); | |
184 | ||
185 | if (line && next) | |
186 | *field = xmemdupz(line, next - line); | |
187 | else | |
188 | *field = NULL; | |
189 | } | |
190 | ||
54887b46 HJI |
191 | static int parse_gpg_trust_level(const char *level, |
192 | enum signature_trust_level *res) | |
193 | { | |
194 | size_t i; | |
195 | ||
196 | for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_trust_level); i++) { | |
197 | if (!strcmp(sigcheck_gpg_trust_level[i].key, level)) { | |
198 | *res = sigcheck_gpg_trust_level[i].value; | |
199 | return 0; | |
200 | } | |
201 | } | |
202 | return 1; | |
203 | } | |
204 | ||
fbd0f166 | 205 | static void parse_gpg_output(struct signature_check *sigc) |
a50e7ca3 JH |
206 | { |
207 | const char *buf = sigc->gpg_status; | |
da6cf1b3 | 208 | const char *line, *next; |
4de9394d | 209 | int i, j; |
da6cf1b3 MG |
210 | int seen_exclusive_status = 0; |
211 | ||
212 | /* Iterate over all lines */ | |
213 | for (line = buf; *line; line = strchrnul(line+1, '\n')) { | |
214 | while (*line == '\n') | |
215 | line++; | |
64c45dc7 SR |
216 | if (!*line) |
217 | break; | |
218 | ||
da6cf1b3 MG |
219 | /* Skip lines that don't start with GNUPG status */ |
220 | if (!skip_prefix(line, "[GNUPG:] ", &line)) | |
221 | continue; | |
222 | ||
223 | /* Iterate over all search strings */ | |
224 | for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) { | |
225 | if (skip_prefix(line, sigcheck_gpg_status[i].check, &line)) { | |
54887b46 HJI |
226 | /* |
227 | * GOODSIG, BADSIG etc. can occur only once for | |
228 | * each signature. Therefore, if we had more | |
229 | * than one then we're dealing with multiple | |
230 | * signatures. We don't support them | |
231 | * currently, and they're rather hard to | |
232 | * create, so something is likely fishy and we | |
233 | * should reject them altogether. | |
234 | */ | |
da6cf1b3 | 235 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_EXCLUSIVE) { |
02561896 | 236 | if (seen_exclusive_status++) |
54887b46 | 237 | goto error; |
da6cf1b3 MG |
238 | } |
239 | ||
3daaaabe MG |
240 | if (sigcheck_gpg_status[i].result) |
241 | sigc->result = sigcheck_gpg_status[i].result; | |
0b11a84e MG |
242 | /* Do we have key information? */ |
243 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_KEYID) { | |
da6cf1b3 | 244 | next = strchrnul(line, ' '); |
392b862e | 245 | replace_cstring(&sigc->key, line, next); |
0b11a84e MG |
246 | /* Do we have signer information? */ |
247 | if (*next && (sigcheck_gpg_status[i].flags & GPG_STATUS_UID)) { | |
da6cf1b3 MG |
248 | line = next + 1; |
249 | next = strchrnul(line, '\n'); | |
392b862e | 250 | replace_cstring(&sigc->signer, line, next); |
da6cf1b3 MG |
251 | } |
252 | } | |
54887b46 HJI |
253 | |
254 | /* Do we have trust level? */ | |
255 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_TRUST_LEVEL) { | |
256 | /* | |
257 | * GPG v1 and v2 differs in how the | |
258 | * TRUST_ lines are written. Some | |
259 | * trust lines contain no additional | |
260 | * space-separated information for v1. | |
261 | */ | |
262 | size_t trust_size = strcspn(line, " \n"); | |
263 | char *trust = xmemdupz(line, trust_size); | |
264 | ||
265 | if (parse_gpg_trust_level(trust, &sigc->trust_level)) { | |
266 | free(trust); | |
267 | goto error; | |
268 | } | |
269 | free(trust); | |
270 | } | |
271 | ||
3daaaabe MG |
272 | /* Do we have fingerprint? */ |
273 | if (sigcheck_gpg_status[i].flags & GPG_STATUS_FINGERPRINT) { | |
67a6ea63 HJI |
274 | const char *limit; |
275 | char **field; | |
276 | ||
3daaaabe | 277 | next = strchrnul(line, ' '); |
392b862e | 278 | replace_cstring(&sigc->fingerprint, line, next); |
4de9394d | 279 | |
67a6ea63 HJI |
280 | /* |
281 | * Skip interim fields. The search is | |
282 | * limited to the same line since only | |
283 | * OpenPGP signatures has a field with | |
284 | * the primary fingerprint. | |
285 | */ | |
286 | limit = strchrnul(line, '\n'); | |
4de9394d | 287 | for (j = 9; j > 0; j--) { |
67a6ea63 | 288 | if (!*next || limit <= next) |
4de9394d MG |
289 | break; |
290 | line = next + 1; | |
291 | next = strchrnul(line, ' '); | |
292 | } | |
293 | ||
67a6ea63 HJI |
294 | field = &sigc->primary_key_fingerprint; |
295 | if (!j) { | |
296 | next = strchrnul(line, '\n'); | |
297 | replace_cstring(field, line, next); | |
298 | } else { | |
299 | replace_cstring(field, NULL, NULL); | |
300 | } | |
3daaaabe | 301 | } |
da6cf1b3 MG |
302 | |
303 | break; | |
661a1806 | 304 | } |
a50e7ca3 JH |
305 | } |
306 | } | |
da6cf1b3 MG |
307 | return; |
308 | ||
54887b46 | 309 | error: |
da6cf1b3 MG |
310 | sigc->result = 'E'; |
311 | /* Clear partial data to avoid confusion */ | |
4de9394d | 312 | FREE_AND_NULL(sigc->primary_key_fingerprint); |
3daaaabe | 313 | FREE_AND_NULL(sigc->fingerprint); |
da6cf1b3 MG |
314 | FREE_AND_NULL(sigc->signer); |
315 | FREE_AND_NULL(sigc->key); | |
a50e7ca3 JH |
316 | } |
317 | ||
b5726a5d | 318 | static int verify_gpg_signed_buffer(struct signature_check *sigc, |
02769437 FS |
319 | struct gpg_format *fmt, |
320 | const char *signature, | |
b5726a5d | 321 | size_t signature_size) |
67948981 HJI |
322 | { |
323 | struct child_process gpg = CHILD_PROCESS_INIT; | |
67948981 HJI |
324 | struct tempfile *temp; |
325 | int ret; | |
b5726a5d FS |
326 | struct strbuf gpg_stdout = STRBUF_INIT; |
327 | struct strbuf gpg_stderr = STRBUF_INIT; | |
67948981 HJI |
328 | |
329 | temp = mks_tempfile_t(".git_vtag_tmpXXXXXX"); | |
330 | if (!temp) | |
331 | return error_errno(_("could not create temporary file")); | |
332 | if (write_in_full(temp->fd, signature, signature_size) < 0 || | |
333 | close_tempfile_gently(temp) < 0) { | |
334 | error_errno(_("failed writing detached signature to '%s'"), | |
335 | temp->filename.buf); | |
336 | delete_tempfile(&temp); | |
337 | return -1; | |
338 | } | |
339 | ||
ef8d7ac4 JK |
340 | strvec_push(&gpg.args, fmt->program); |
341 | strvec_pushv(&gpg.args, fmt->verify_args); | |
342 | strvec_pushl(&gpg.args, | |
f6d8942b JK |
343 | "--status-fd=1", |
344 | "--verify", temp->filename.buf, "-", | |
345 | NULL); | |
67948981 | 346 | |
67948981 | 347 | sigchain_push(SIGPIPE, SIG_IGN); |
02769437 | 348 | ret = pipe_command(&gpg, sigc->payload, sigc->payload_len, &gpg_stdout, 0, |
b5726a5d | 349 | &gpg_stderr, 0); |
67948981 HJI |
350 | sigchain_pop(SIGPIPE); |
351 | ||
352 | delete_tempfile(&temp); | |
353 | ||
b5726a5d | 354 | ret |= !strstr(gpg_stdout.buf, "\n[GNUPG:] GOODSIG "); |
b5726a5d FS |
355 | sigc->output = strbuf_detach(&gpg_stderr, NULL); |
356 | sigc->gpg_status = strbuf_detach(&gpg_stdout, NULL); | |
357 | ||
358 | parse_gpg_output(sigc); | |
359 | ||
360 | strbuf_release(&gpg_stdout); | |
361 | strbuf_release(&gpg_stderr); | |
67948981 HJI |
362 | |
363 | return ret; | |
364 | } | |
365 | ||
facca53a FS |
366 | static void parse_ssh_output(struct signature_check *sigc) |
367 | { | |
368 | const char *line, *principal, *search; | |
78d468f1 | 369 | char *to_free; |
facca53a FS |
370 | char *key = NULL; |
371 | ||
372 | /* | |
373 | * ssh-keygen output should be: | |
374 | * Good "git" signature for PRINCIPAL with RSA key SHA256:FINGERPRINT | |
375 | * | |
376 | * or for valid but unknown keys: | |
377 | * Good "git" signature with RSA key SHA256:FINGERPRINT | |
378 | * | |
379 | * Note that "PRINCIPAL" can contain whitespace, "RSA" and | |
380 | * "SHA256" part could be a different token that names of | |
381 | * the algorithms used, and "FINGERPRINT" is a hexadecimal | |
382 | * string. By finding the last occurence of " with ", we can | |
383 | * reliably parse out the PRINCIPAL. | |
384 | */ | |
385 | sigc->result = 'B'; | |
386 | sigc->trust_level = TRUST_NEVER; | |
387 | ||
78d468f1 | 388 | line = to_free = xmemdupz(sigc->output, strcspn(sigc->output, "\n")); |
facca53a FS |
389 | |
390 | if (skip_prefix(line, "Good \"git\" signature for ", &line)) { | |
facca53a FS |
391 | /* Search for the last "with" to get the full principal */ |
392 | principal = line; | |
393 | do { | |
394 | search = strstr(line, " with "); | |
395 | if (search) | |
396 | line = search + 1; | |
397 | } while (search != NULL); | |
18b18503 RS |
398 | if (line == principal) |
399 | goto cleanup; | |
400 | ||
401 | /* Valid signature and known principal */ | |
402 | sigc->result = 'G'; | |
403 | sigc->trust_level = TRUST_FULLY; | |
facca53a FS |
404 | sigc->signer = xmemdupz(principal, line - principal - 1); |
405 | } else if (skip_prefix(line, "Good \"git\" signature with ", &line)) { | |
406 | /* Valid signature, but key unknown */ | |
407 | sigc->result = 'G'; | |
408 | sigc->trust_level = TRUST_UNDEFINED; | |
409 | } else { | |
78d468f1 | 410 | goto cleanup; |
facca53a FS |
411 | } |
412 | ||
65db97b4 | 413 | key = strstr(line, "key "); |
facca53a | 414 | if (key) { |
65db97b4 | 415 | sigc->fingerprint = xstrdup(strstr(line, "key ") + 4); |
facca53a FS |
416 | sigc->key = xstrdup(sigc->fingerprint); |
417 | } else { | |
418 | /* | |
419 | * Output did not match what we expected | |
420 | * Treat the signature as bad | |
421 | */ | |
422 | sigc->result = 'B'; | |
423 | } | |
78d468f1 JK |
424 | |
425 | cleanup: | |
426 | free(to_free); | |
facca53a FS |
427 | } |
428 | ||
429 | static int verify_ssh_signed_buffer(struct signature_check *sigc, | |
02769437 FS |
430 | struct gpg_format *fmt, |
431 | const char *signature, | |
facca53a FS |
432 | size_t signature_size) |
433 | { | |
434 | struct child_process ssh_keygen = CHILD_PROCESS_INIT; | |
435 | struct tempfile *buffer_file; | |
436 | int ret = -1; | |
437 | const char *line; | |
facca53a FS |
438 | char *principal; |
439 | struct strbuf ssh_principals_out = STRBUF_INIT; | |
440 | struct strbuf ssh_principals_err = STRBUF_INIT; | |
441 | struct strbuf ssh_keygen_out = STRBUF_INIT; | |
442 | struct strbuf ssh_keygen_err = STRBUF_INIT; | |
6393c956 FS |
443 | struct strbuf verify_time = STRBUF_INIT; |
444 | const struct date_mode verify_date_mode = { | |
445 | .type = DATE_STRFTIME, | |
446 | .strftime_fmt = "%Y%m%d%H%M%S", | |
447 | /* SSH signing key validity has no timezone information - Use the local timezone */ | |
448 | .local = 1, | |
449 | }; | |
facca53a FS |
450 | |
451 | if (!ssh_allowed_signers) { | |
452 | error(_("gpg.ssh.allowedSignersFile needs to be configured and exist for ssh signature verification")); | |
453 | return -1; | |
454 | } | |
455 | ||
456 | buffer_file = mks_tempfile_t(".git_vtag_tmpXXXXXX"); | |
457 | if (!buffer_file) | |
458 | return error_errno(_("could not create temporary file")); | |
459 | if (write_in_full(buffer_file->fd, signature, signature_size) < 0 || | |
460 | close_tempfile_gently(buffer_file) < 0) { | |
461 | error_errno(_("failed writing detached signature to '%s'"), | |
462 | buffer_file->filename.buf); | |
463 | delete_tempfile(&buffer_file); | |
464 | return -1; | |
465 | } | |
466 | ||
6393c956 FS |
467 | if (sigc->payload_timestamp) |
468 | strbuf_addf(&verify_time, "-Overify-time=%s", | |
469 | show_date(sigc->payload_timestamp, 0, &verify_date_mode)); | |
470 | ||
facca53a FS |
471 | /* Find the principal from the signers */ |
472 | strvec_pushl(&ssh_keygen.args, fmt->program, | |
473 | "-Y", "find-principals", | |
474 | "-f", ssh_allowed_signers, | |
475 | "-s", buffer_file->filename.buf, | |
6393c956 | 476 | verify_time.buf, |
facca53a FS |
477 | NULL); |
478 | ret = pipe_command(&ssh_keygen, NULL, 0, &ssh_principals_out, 0, | |
479 | &ssh_principals_err, 0); | |
480 | if (ret && strstr(ssh_principals_err.buf, "usage:")) { | |
481 | error(_("ssh-keygen -Y find-principals/verify is needed for ssh signature verification (available in openssh version 8.2p1+)")); | |
482 | goto out; | |
483 | } | |
484 | if (ret || !ssh_principals_out.len) { | |
485 | /* | |
486 | * We did not find a matching principal in the allowedSigners | |
487 | * Check without validation | |
488 | */ | |
489 | child_process_init(&ssh_keygen); | |
490 | strvec_pushl(&ssh_keygen.args, fmt->program, | |
491 | "-Y", "check-novalidate", | |
492 | "-n", "git", | |
493 | "-s", buffer_file->filename.buf, | |
6393c956 | 494 | verify_time.buf, |
facca53a | 495 | NULL); |
02769437 | 496 | pipe_command(&ssh_keygen, sigc->payload, sigc->payload_len, |
facca53a FS |
497 | &ssh_keygen_out, 0, &ssh_keygen_err, 0); |
498 | ||
499 | /* | |
500 | * Fail on unknown keys | |
501 | * we still call check-novalidate to display the signature info | |
502 | */ | |
503 | ret = -1; | |
504 | } else { | |
505 | /* Check every principal we found (one per line) */ | |
caeef01e FS |
506 | const char *next; |
507 | for (line = ssh_principals_out.buf; | |
508 | *line; | |
509 | line = next) { | |
510 | const char *end_of_text; | |
511 | ||
512 | next = end_of_text = strchrnul(line, '\n'); | |
513 | ||
514 | /* Did we find a LF, and did we have CR before it? */ | |
515 | if (*end_of_text && | |
516 | line < end_of_text && | |
517 | end_of_text[-1] == '\r') | |
518 | end_of_text--; | |
519 | ||
520 | /* Unless we hit NUL, skip over the LF we found */ | |
521 | if (*next) | |
522 | next++; | |
523 | ||
524 | /* Not all lines are data. Skip empty ones */ | |
525 | if (line == end_of_text) | |
526 | continue; | |
527 | ||
528 | /* We now know we have an non-empty line. Process it */ | |
529 | principal = xmemdupz(line, end_of_text - line); | |
facca53a FS |
530 | |
531 | child_process_init(&ssh_keygen); | |
532 | strbuf_release(&ssh_keygen_out); | |
533 | strbuf_release(&ssh_keygen_err); | |
534 | strvec_push(&ssh_keygen.args, fmt->program); | |
535 | /* | |
536 | * We found principals | |
537 | * Try with each until we find a match | |
538 | */ | |
539 | strvec_pushl(&ssh_keygen.args, "-Y", "verify", | |
540 | "-n", "git", | |
541 | "-f", ssh_allowed_signers, | |
542 | "-I", principal, | |
543 | "-s", buffer_file->filename.buf, | |
6393c956 | 544 | verify_time.buf, |
facca53a FS |
545 | NULL); |
546 | ||
547 | if (ssh_revocation_file) { | |
548 | if (file_exists(ssh_revocation_file)) { | |
549 | strvec_pushl(&ssh_keygen.args, "-r", | |
550 | ssh_revocation_file, NULL); | |
551 | } else { | |
552 | warning(_("ssh signing revocation file configured but not found: %s"), | |
553 | ssh_revocation_file); | |
554 | } | |
555 | } | |
556 | ||
557 | sigchain_push(SIGPIPE, SIG_IGN); | |
02769437 | 558 | ret = pipe_command(&ssh_keygen, sigc->payload, sigc->payload_len, |
facca53a FS |
559 | &ssh_keygen_out, 0, &ssh_keygen_err, 0); |
560 | sigchain_pop(SIGPIPE); | |
561 | ||
562 | FREE_AND_NULL(principal); | |
563 | ||
564 | if (!ret) | |
565 | ret = !starts_with(ssh_keygen_out.buf, "Good"); | |
566 | ||
567 | if (!ret) | |
568 | break; | |
569 | } | |
570 | } | |
571 | ||
facca53a FS |
572 | strbuf_stripspace(&ssh_keygen_out, 0); |
573 | strbuf_stripspace(&ssh_keygen_err, 0); | |
574 | /* Add stderr outputs to show the user actual ssh-keygen errors */ | |
575 | strbuf_add(&ssh_keygen_out, ssh_principals_err.buf, ssh_principals_err.len); | |
576 | strbuf_add(&ssh_keygen_out, ssh_keygen_err.buf, ssh_keygen_err.len); | |
577 | sigc->output = strbuf_detach(&ssh_keygen_out, NULL); | |
578 | sigc->gpg_status = xstrdup(sigc->output); | |
579 | ||
580 | parse_ssh_output(sigc); | |
581 | ||
582 | out: | |
583 | if (buffer_file) | |
584 | delete_tempfile(&buffer_file); | |
585 | strbuf_release(&ssh_principals_out); | |
586 | strbuf_release(&ssh_principals_err); | |
587 | strbuf_release(&ssh_keygen_out); | |
588 | strbuf_release(&ssh_keygen_err); | |
6393c956 | 589 | strbuf_release(&verify_time); |
facca53a FS |
590 | |
591 | return ret; | |
592 | } | |
593 | ||
6393c956 FS |
594 | static int parse_payload_metadata(struct signature_check *sigc) |
595 | { | |
596 | const char *ident_line = NULL; | |
597 | size_t ident_len; | |
598 | struct ident_split ident; | |
599 | const char *signer_header; | |
600 | ||
601 | switch (sigc->payload_type) { | |
602 | case SIGNATURE_PAYLOAD_COMMIT: | |
603 | signer_header = "committer"; | |
604 | break; | |
605 | case SIGNATURE_PAYLOAD_TAG: | |
606 | signer_header = "tagger"; | |
607 | break; | |
608 | case SIGNATURE_PAYLOAD_UNDEFINED: | |
609 | case SIGNATURE_PAYLOAD_PUSH_CERT: | |
610 | /* Ignore payloads we don't want to parse */ | |
611 | return 0; | |
612 | default: | |
613 | BUG("invalid value for sigc->payload_type"); | |
614 | } | |
615 | ||
616 | ident_line = find_commit_header(sigc->payload, signer_header, &ident_len); | |
617 | if (!ident_line || !ident_len) | |
618 | return 1; | |
619 | ||
620 | if (split_ident_line(&ident, ident_line, ident_len)) | |
621 | return 1; | |
622 | ||
623 | if (!sigc->payload_timestamp && ident.date_begin && ident.date_end) | |
624 | sigc->payload_timestamp = parse_timestamp(ident.date_begin, NULL, 10); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
02769437 FS |
629 | int check_signature(struct signature_check *sigc, |
630 | const char *signature, size_t slen) | |
a4cc18f2 | 631 | { |
b5726a5d | 632 | struct gpg_format *fmt; |
a4cc18f2 | 633 | int status; |
634 | ||
635 | sigc->result = 'N'; | |
54887b46 | 636 | sigc->trust_level = -1; |
a4cc18f2 | 637 | |
b5726a5d FS |
638 | fmt = get_format_by_sig(signature); |
639 | if (!fmt) | |
640 | die(_("bad/incompatible signature '%s'"), signature); | |
641 | ||
6393c956 FS |
642 | if (parse_payload_metadata(sigc)) |
643 | return 1; | |
644 | ||
02769437 | 645 | status = fmt->verify_signed_buffer(sigc, fmt, signature, slen); |
b5726a5d FS |
646 | |
647 | if (status && !sigc->output) | |
648 | return !!status; | |
649 | ||
54887b46 HJI |
650 | status |= sigc->result != 'G'; |
651 | status |= sigc->trust_level < configured_min_trust_level; | |
a4cc18f2 | 652 | |
4e5dc9ca | 653 | return !!status; |
a4cc18f2 | 654 | } |
655 | ||
ca194d50 | 656 | void print_signature_buffer(const struct signature_check *sigc, unsigned flags) |
657 | { | |
b5726a5d FS |
658 | const char *output = flags & GPG_VERIFY_RAW ? sigc->gpg_status : |
659 | sigc->output; | |
aeff29dd | 660 | |
ca194d50 | 661 | if (flags & GPG_VERIFY_VERBOSE && sigc->payload) |
02769437 | 662 | fwrite(sigc->payload, 1, sigc->payload_len, stdout); |
ca194d50 | 663 | |
aeff29dd | 664 | if (output) |
665 | fputs(output, stderr); | |
ca194d50 | 666 | } |
667 | ||
482c1191 | 668 | size_t parse_signed_buffer(const char *buf, size_t size) |
d7c67668 | 669 | { |
d7c67668 | 670 | size_t len = 0; |
8b44b2be JK |
671 | size_t match = size; |
672 | while (len < size) { | |
673 | const char *eol; | |
674 | ||
58af57e1 | 675 | if (get_format_by_sig(buf + len)) |
8b44b2be JK |
676 | match = len; |
677 | ||
678 | eol = memchr(buf + len, '\n', size - len); | |
d7c67668 JH |
679 | len += eol ? eol - (buf + len) + 1 : size - len; |
680 | } | |
8b44b2be | 681 | return match; |
d7c67668 JH |
682 | } |
683 | ||
482c1191 | 684 | int parse_signature(const char *buf, size_t size, struct strbuf *payload, struct strbuf *signature) |
685 | { | |
686 | size_t match = parse_signed_buffer(buf, size); | |
687 | if (match != size) { | |
688 | strbuf_add(payload, buf, match); | |
9b27b492 | 689 | remove_signature(payload); |
482c1191 | 690 | strbuf_add(signature, buf + match, size - match); |
691 | return 1; | |
692 | } | |
693 | return 0; | |
694 | } | |
695 | ||
2f47eae2 JH |
696 | void set_signing_key(const char *key) |
697 | { | |
698 | free(configured_signing_key); | |
699 | configured_signing_key = xstrdup(key); | |
700 | } | |
701 | ||
5cf88fd8 | 702 | int git_gpg_config(const char *var, const char *value, void *cb UNUSED) |
2f47eae2 | 703 | { |
58af57e1 HS |
704 | struct gpg_format *fmt = NULL; |
705 | char *fmtname = NULL; | |
54887b46 HJI |
706 | char *trust; |
707 | int ret; | |
58af57e1 | 708 | |
2f47eae2 | 709 | if (!strcmp(var, "user.signingkey")) { |
1b0eeec3 JK |
710 | if (!value) |
711 | return config_error_nonbool(var); | |
0c5e70f0 | 712 | set_signing_key(value); |
1b0eeec3 | 713 | return 0; |
0c5e70f0 | 714 | } |
1b0eeec3 | 715 | |
57a8dd75 HS |
716 | if (!strcmp(var, "gpg.format")) { |
717 | if (!value) | |
718 | return config_error_nonbool(var); | |
58af57e1 HS |
719 | fmt = get_format_by_name(value); |
720 | if (!fmt) | |
1a8aea85 | 721 | return error(_("invalid value for '%s': '%s'"), |
57a8dd75 | 722 | var, value); |
58af57e1 HS |
723 | use_format = fmt; |
724 | return 0; | |
57a8dd75 HS |
725 | } |
726 | ||
54887b46 HJI |
727 | if (!strcmp(var, "gpg.mintrustlevel")) { |
728 | if (!value) | |
729 | return config_error_nonbool(var); | |
730 | ||
731 | trust = xstrdup_toupper(value); | |
732 | ret = parse_gpg_trust_level(trust, &configured_min_trust_level); | |
733 | free(trust); | |
734 | ||
735 | if (ret) | |
1a8aea85 JNA |
736 | return error(_("invalid value for '%s': '%s'"), |
737 | var, value); | |
54887b46 HJI |
738 | return 0; |
739 | } | |
740 | ||
fd9e2267 FS |
741 | if (!strcmp(var, "gpg.ssh.defaultkeycommand")) { |
742 | if (!value) | |
743 | return config_error_nonbool(var); | |
744 | return git_config_string(&ssh_default_key_command, var, value); | |
745 | } | |
746 | ||
facca53a FS |
747 | if (!strcmp(var, "gpg.ssh.allowedsignersfile")) { |
748 | if (!value) | |
749 | return config_error_nonbool(var); | |
750 | return git_config_pathname(&ssh_allowed_signers, var, value); | |
751 | } | |
752 | ||
753 | if (!strcmp(var, "gpg.ssh.revocationfile")) { | |
754 | if (!value) | |
755 | return config_error_nonbool(var); | |
756 | return git_config_pathname(&ssh_revocation_file, var, value); | |
757 | } | |
758 | ||
b02f51b1 | 759 | if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program")) |
58af57e1 HS |
760 | fmtname = "openpgp"; |
761 | ||
1e7adb97 HS |
762 | if (!strcmp(var, "gpg.x509.program")) |
763 | fmtname = "x509"; | |
764 | ||
29b31577 FS |
765 | if (!strcmp(var, "gpg.ssh.program")) |
766 | fmtname = "ssh"; | |
767 | ||
58af57e1 HS |
768 | if (fmtname) { |
769 | fmt = get_format_by_name(fmtname); | |
770 | return git_config_string(&fmt->program, var, value); | |
2f47eae2 | 771 | } |
1b0eeec3 | 772 | |
2f47eae2 JH |
773 | return 0; |
774 | } | |
775 | ||
350a2518 FS |
776 | /* |
777 | * Returns 1 if `string` contains a literal ssh key, 0 otherwise | |
778 | * `key` will be set to the start of the actual key if a prefix is present. | |
779 | */ | |
780 | static int is_literal_ssh_key(const char *string, const char **key) | |
781 | { | |
782 | if (skip_prefix(string, "key::", key)) | |
783 | return 1; | |
784 | if (starts_with(string, "ssh-")) { | |
785 | *key = string; | |
786 | return 1; | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
4838f62c FS |
791 | static char *get_ssh_key_fingerprint(const char *signing_key) |
792 | { | |
793 | struct child_process ssh_keygen = CHILD_PROCESS_INIT; | |
794 | int ret = -1; | |
795 | struct strbuf fingerprint_stdout = STRBUF_INIT; | |
796 | struct strbuf **fingerprint; | |
f3af71c9 | 797 | char *fingerprint_ret; |
350a2518 | 798 | const char *literal_key = NULL; |
4838f62c FS |
799 | |
800 | /* | |
801 | * With SSH Signing this can contain a filename or a public key | |
802 | * For textual representation we usually want a fingerprint | |
803 | */ | |
350a2518 | 804 | if (is_literal_ssh_key(signing_key, &literal_key)) { |
4838f62c | 805 | strvec_pushl(&ssh_keygen.args, "ssh-keygen", "-lf", "-", NULL); |
350a2518 FS |
806 | ret = pipe_command(&ssh_keygen, literal_key, |
807 | strlen(literal_key), &fingerprint_stdout, 0, | |
4838f62c FS |
808 | NULL, 0); |
809 | } else { | |
810 | strvec_pushl(&ssh_keygen.args, "ssh-keygen", "-lf", | |
811 | configured_signing_key, NULL); | |
812 | ret = pipe_command(&ssh_keygen, NULL, 0, &fingerprint_stdout, 0, | |
813 | NULL, 0); | |
814 | } | |
815 | ||
816 | if (!!ret) | |
817 | die_errno(_("failed to get the ssh fingerprint for key '%s'"), | |
818 | signing_key); | |
819 | ||
820 | fingerprint = strbuf_split_max(&fingerprint_stdout, ' ', 3); | |
821 | if (!fingerprint[1]) | |
822 | die_errno(_("failed to get the ssh fingerprint for key '%s'"), | |
823 | signing_key); | |
824 | ||
f3af71c9 JK |
825 | fingerprint_ret = strbuf_detach(fingerprint[1], NULL); |
826 | strbuf_list_free(fingerprint); | |
827 | strbuf_release(&fingerprint_stdout); | |
828 | return fingerprint_ret; | |
4838f62c FS |
829 | } |
830 | ||
fd9e2267 FS |
831 | /* Returns the first public key from an ssh-agent to use for signing */ |
832 | static const char *get_default_ssh_signing_key(void) | |
833 | { | |
834 | struct child_process ssh_default_key = CHILD_PROCESS_INIT; | |
835 | int ret = -1; | |
836 | struct strbuf key_stdout = STRBUF_INIT, key_stderr = STRBUF_INIT; | |
837 | struct strbuf **keys; | |
838 | char *key_command = NULL; | |
839 | const char **argv; | |
840 | int n; | |
841 | char *default_key = NULL; | |
350a2518 | 842 | const char *literal_key = NULL; |
fd9e2267 FS |
843 | |
844 | if (!ssh_default_key_command) | |
845 | die(_("either user.signingkey or gpg.ssh.defaultKeyCommand needs to be configured")); | |
846 | ||
847 | key_command = xstrdup(ssh_default_key_command); | |
848 | n = split_cmdline(key_command, &argv); | |
849 | ||
850 | if (n < 0) | |
851 | die("malformed build-time gpg.ssh.defaultKeyCommand: %s", | |
852 | split_cmdline_strerror(n)); | |
853 | ||
854 | strvec_pushv(&ssh_default_key.args, argv); | |
855 | ret = pipe_command(&ssh_default_key, NULL, 0, &key_stdout, 0, | |
856 | &key_stderr, 0); | |
857 | ||
858 | if (!ret) { | |
859 | keys = strbuf_split_max(&key_stdout, '\n', 2); | |
350a2518 FS |
860 | if (keys[0] && is_literal_ssh_key(keys[0]->buf, &literal_key)) { |
861 | /* | |
862 | * We only use `is_literal_ssh_key` here to check validity | |
863 | * The prefix will be stripped when the key is used. | |
864 | */ | |
fd9e2267 FS |
865 | default_key = strbuf_detach(keys[0], NULL); |
866 | } else { | |
f7337193 | 867 | warning(_("gpg.ssh.defaultKeyCommand succeeded but returned no keys: %s %s"), |
fd9e2267 FS |
868 | key_stderr.buf, key_stdout.buf); |
869 | } | |
870 | ||
871 | strbuf_list_free(keys); | |
872 | } else { | |
873 | warning(_("gpg.ssh.defaultKeyCommand failed: %s %s"), | |
874 | key_stderr.buf, key_stdout.buf); | |
875 | } | |
876 | ||
877 | free(key_command); | |
878 | free(argv); | |
879 | strbuf_release(&key_stdout); | |
880 | ||
881 | return default_key; | |
882 | } | |
883 | ||
4838f62c FS |
884 | static const char *get_ssh_key_id(void) { |
885 | return get_ssh_key_fingerprint(get_signing_key()); | |
886 | } | |
887 | ||
888 | /* Returns a textual but unique representation of the signing key */ | |
889 | const char *get_signing_key_id(void) | |
890 | { | |
891 | if (use_format->get_key_id) { | |
892 | return use_format->get_key_id(); | |
893 | } | |
894 | ||
895 | /* GPG/GPGSM only store a key id on this variable */ | |
896 | return get_signing_key(); | |
897 | } | |
898 | ||
2f47eae2 JH |
899 | const char *get_signing_key(void) |
900 | { | |
901 | if (configured_signing_key) | |
902 | return configured_signing_key; | |
fd9e2267 FS |
903 | if (use_format->get_default_key) { |
904 | return use_format->get_default_key(); | |
905 | } | |
906 | ||
907 | return git_committer_info(IDENT_STRICT | IDENT_NO_DATE); | |
2f47eae2 JH |
908 | } |
909 | ||
803978da JD |
910 | const char *gpg_trust_level_to_str(enum signature_trust_level level) |
911 | { | |
912 | struct sigcheck_gpg_trust_level *trust; | |
913 | ||
914 | if (level < 0 || level >= ARRAY_SIZE(sigcheck_gpg_trust_level)) | |
915 | BUG("invalid trust level requested %d", level); | |
916 | ||
917 | trust = &sigcheck_gpg_trust_level[level]; | |
918 | if (trust->value != level) | |
919 | BUG("sigcheck_gpg_trust_level[] unsorted"); | |
920 | ||
921 | return sigcheck_gpg_trust_level[level].display_key; | |
922 | } | |
923 | ||
2f47eae2 | 924 | int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key) |
b5726a5d FS |
925 | { |
926 | return use_format->sign_buffer(buffer, signature, signing_key); | |
927 | } | |
928 | ||
29b31577 FS |
929 | /* |
930 | * Strip CR from the line endings, in case we are on Windows. | |
931 | * NEEDSWORK: make it trim only CRs before LFs and rename | |
932 | */ | |
933 | static void remove_cr_after(struct strbuf *buffer, size_t offset) | |
934 | { | |
935 | size_t i, j; | |
936 | ||
937 | for (i = j = offset; i < buffer->len; i++) { | |
938 | if (buffer->buf[i] != '\r') { | |
939 | if (i != j) | |
940 | buffer->buf[j] = buffer->buf[i]; | |
941 | j++; | |
942 | } | |
943 | } | |
944 | strbuf_setlen(buffer, j); | |
945 | } | |
946 | ||
b5726a5d FS |
947 | static int sign_buffer_gpg(struct strbuf *buffer, struct strbuf *signature, |
948 | const char *signing_key) | |
2f47eae2 | 949 | { |
d3180279 | 950 | struct child_process gpg = CHILD_PROCESS_INIT; |
0581b546 | 951 | int ret; |
29b31577 | 952 | size_t bottom; |
a075e79d | 953 | const char *cp; |
efee9553 | 954 | struct strbuf gpg_status = STRBUF_INIT; |
2f47eae2 | 955 | |
ef8d7ac4 | 956 | strvec_pushl(&gpg.args, |
f6d8942b JK |
957 | use_format->program, |
958 | "--status-fd=2", | |
959 | "-bsau", signing_key, | |
960 | NULL); | |
2f47eae2 | 961 | |
0581b546 | 962 | bottom = signature->len; |
2f47eae2 JH |
963 | |
964 | /* | |
965 | * When the username signingkey is bad, program could be terminated | |
966 | * because gpg exits without reading and then write gets SIGPIPE. | |
967 | */ | |
968 | sigchain_push(SIGPIPE, SIG_IGN); | |
0581b546 | 969 | ret = pipe_command(&gpg, buffer->buf, buffer->len, |
efee9553 | 970 | signature, 1024, &gpg_status, 0); |
2f47eae2 JH |
971 | sigchain_pop(SIGPIPE); |
972 | ||
a075e79d FS |
973 | for (cp = gpg_status.buf; |
974 | cp && (cp = strstr(cp, "[GNUPG:] SIG_CREATED ")); | |
975 | cp++) { | |
976 | if (cp == gpg_status.buf || cp[-1] == '\n') | |
977 | break; /* found */ | |
978 | } | |
979 | ret |= !cp; | |
efee9553 MG |
980 | strbuf_release(&gpg_status); |
981 | if (ret) | |
2f47eae2 JH |
982 | return error(_("gpg failed to sign the data")); |
983 | ||
984 | /* Strip CR from the line endings, in case we are on Windows. */ | |
29b31577 | 985 | remove_cr_after(signature, bottom); |
2f47eae2 JH |
986 | |
987 | return 0; | |
988 | } | |
29b31577 FS |
989 | |
990 | static int sign_buffer_ssh(struct strbuf *buffer, struct strbuf *signature, | |
991 | const char *signing_key) | |
992 | { | |
993 | struct child_process signer = CHILD_PROCESS_INIT; | |
994 | int ret = -1; | |
995 | size_t bottom, keylen; | |
996 | struct strbuf signer_stderr = STRBUF_INIT; | |
997 | struct tempfile *key_file = NULL, *buffer_file = NULL; | |
998 | char *ssh_signing_key_file = NULL; | |
999 | struct strbuf ssh_signature_filename = STRBUF_INIT; | |
350a2518 | 1000 | const char *literal_key = NULL; |
29b31577 FS |
1001 | |
1002 | if (!signing_key || signing_key[0] == '\0') | |
1003 | return error( | |
b4eda05d | 1004 | _("user.signingKey needs to be set for ssh signing")); |
29b31577 | 1005 | |
350a2518 | 1006 | if (is_literal_ssh_key(signing_key, &literal_key)) { |
29b31577 FS |
1007 | /* A literal ssh key */ |
1008 | key_file = mks_tempfile_t(".git_signing_key_tmpXXXXXX"); | |
1009 | if (!key_file) | |
1010 | return error_errno( | |
1011 | _("could not create temporary file")); | |
350a2518 FS |
1012 | keylen = strlen(literal_key); |
1013 | if (write_in_full(key_file->fd, literal_key, keylen) < 0 || | |
29b31577 FS |
1014 | close_tempfile_gently(key_file) < 0) { |
1015 | error_errno(_("failed writing ssh signing key to '%s'"), | |
1016 | key_file->filename.buf); | |
1017 | goto out; | |
1018 | } | |
1019 | ssh_signing_key_file = strbuf_detach(&key_file->filename, NULL); | |
1020 | } else { | |
1021 | /* We assume a file */ | |
1022 | ssh_signing_key_file = expand_user_path(signing_key, 1); | |
1023 | } | |
1024 | ||
1025 | buffer_file = mks_tempfile_t(".git_signing_buffer_tmpXXXXXX"); | |
1026 | if (!buffer_file) { | |
1027 | error_errno(_("could not create temporary file")); | |
1028 | goto out; | |
1029 | } | |
1030 | ||
1031 | if (write_in_full(buffer_file->fd, buffer->buf, buffer->len) < 0 || | |
1032 | close_tempfile_gently(buffer_file) < 0) { | |
1033 | error_errno(_("failed writing ssh signing key buffer to '%s'"), | |
1034 | buffer_file->filename.buf); | |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | strvec_pushl(&signer.args, use_format->program, | |
1039 | "-Y", "sign", | |
1040 | "-n", "git", | |
1041 | "-f", ssh_signing_key_file, | |
1042 | buffer_file->filename.buf, | |
1043 | NULL); | |
1044 | ||
1045 | sigchain_push(SIGPIPE, SIG_IGN); | |
1046 | ret = pipe_command(&signer, NULL, 0, NULL, 0, &signer_stderr, 0); | |
1047 | sigchain_pop(SIGPIPE); | |
1048 | ||
1049 | if (ret) { | |
1050 | if (strstr(signer_stderr.buf, "usage:")) | |
1051 | error(_("ssh-keygen -Y sign is needed for ssh signing (available in openssh version 8.2p1+)")); | |
1052 | ||
1053 | error("%s", signer_stderr.buf); | |
1054 | goto out; | |
1055 | } | |
1056 | ||
1057 | bottom = signature->len; | |
1058 | ||
1059 | strbuf_addbuf(&ssh_signature_filename, &buffer_file->filename); | |
1060 | strbuf_addstr(&ssh_signature_filename, ".sig"); | |
1061 | if (strbuf_read_file(signature, ssh_signature_filename.buf, 0) < 0) { | |
1062 | error_errno( | |
1063 | _("failed reading ssh signing data buffer from '%s'"), | |
1064 | ssh_signature_filename.buf); | |
1065 | } | |
1066 | unlink_or_warn(ssh_signature_filename.buf); | |
1067 | ||
1068 | /* Strip CR from the line endings, in case we are on Windows. */ | |
1069 | remove_cr_after(signature, bottom); | |
1070 | ||
1071 | out: | |
1072 | if (key_file) | |
1073 | delete_tempfile(&key_file); | |
1074 | if (buffer_file) | |
1075 | delete_tempfile(&buffer_file); | |
1076 | strbuf_release(&signer_stderr); | |
1077 | strbuf_release(&ssh_signature_filename); | |
1078 | FREE_AND_NULL(ssh_signing_key_file); | |
1079 | return ret; | |
1080 | } |