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Commit | Line | Data |
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2f47eae2 JH |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
3 | #include "strbuf.h" | |
4 | #include "gpg-interface.h" | |
5 | #include "sigchain.h" | |
6 | ||
7 | static char *configured_signing_key; | |
0c5e70f0 | 8 | static const char *gpg_program = "gpg"; |
2f47eae2 | 9 | |
01e57b5d MG |
10 | void signature_check_clear(struct signature_check *sigc) |
11 | { | |
71c214c8 | 12 | free(sigc->payload); |
01e57b5d MG |
13 | free(sigc->gpg_output); |
14 | free(sigc->gpg_status); | |
15 | free(sigc->signer); | |
16 | free(sigc->key); | |
71c214c8 | 17 | sigc->payload = NULL; |
01e57b5d MG |
18 | sigc->gpg_output = NULL; |
19 | sigc->gpg_status = NULL; | |
20 | sigc->signer = NULL; | |
21 | sigc->key = NULL; | |
22 | } | |
23 | ||
a50e7ca3 JH |
24 | static struct { |
25 | char result; | |
26 | const char *check; | |
27 | } sigcheck_gpg_status[] = { | |
28 | { 'G', "\n[GNUPG:] GOODSIG " }, | |
29 | { 'B', "\n[GNUPG:] BADSIG " }, | |
30 | { 'U', "\n[GNUPG:] TRUST_NEVER" }, | |
31 | { 'U', "\n[GNUPG:] TRUST_UNDEFINED" }, | |
32 | }; | |
33 | ||
34 | void parse_gpg_output(struct signature_check *sigc) | |
35 | { | |
36 | const char *buf = sigc->gpg_status; | |
37 | int i; | |
38 | ||
39 | /* Iterate over all search strings */ | |
40 | for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) { | |
41 | const char *found, *next; | |
42 | ||
43 | if (!skip_prefix(buf, sigcheck_gpg_status[i].check + 1, &found)) { | |
44 | found = strstr(buf, sigcheck_gpg_status[i].check); | |
45 | if (!found) | |
46 | continue; | |
47 | found += strlen(sigcheck_gpg_status[i].check); | |
48 | } | |
49 | sigc->result = sigcheck_gpg_status[i].result; | |
50 | /* The trust messages are not followed by key/signer information */ | |
51 | if (sigc->result != 'U') { | |
52 | sigc->key = xmemdupz(found, 16); | |
53 | found += 17; | |
54 | next = strchrnul(found, '\n'); | |
55 | sigc->signer = xmemdupz(found, next - found); | |
56 | } | |
57 | } | |
58 | } | |
59 | ||
2f47eae2 JH |
60 | void set_signing_key(const char *key) |
61 | { | |
62 | free(configured_signing_key); | |
63 | configured_signing_key = xstrdup(key); | |
64 | } | |
65 | ||
66 | int git_gpg_config(const char *var, const char *value, void *cb) | |
67 | { | |
68 | if (!strcmp(var, "user.signingkey")) { | |
0c5e70f0 JH |
69 | set_signing_key(value); |
70 | } | |
71 | if (!strcmp(var, "gpg.program")) { | |
2f47eae2 JH |
72 | if (!value) |
73 | return config_error_nonbool(var); | |
0c5e70f0 | 74 | gpg_program = xstrdup(value); |
2f47eae2 JH |
75 | } |
76 | return 0; | |
77 | } | |
78 | ||
79 | const char *get_signing_key(void) | |
80 | { | |
81 | if (configured_signing_key) | |
82 | return configured_signing_key; | |
f9bc573f | 83 | return git_committer_info(IDENT_STRICT|IDENT_NO_DATE); |
2f47eae2 JH |
84 | } |
85 | ||
86 | /* | |
87 | * Create a detached signature for the contents of "buffer" and append | |
88 | * it after "signature"; "buffer" and "signature" can be the same | |
89 | * strbuf instance, which would cause the detached signature appended | |
90 | * at the end. | |
91 | */ | |
92 | int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key) | |
93 | { | |
94 | struct child_process gpg; | |
95 | const char *args[4]; | |
96 | ssize_t len; | |
97 | size_t i, j, bottom; | |
98 | ||
99 | memset(&gpg, 0, sizeof(gpg)); | |
100 | gpg.argv = args; | |
101 | gpg.in = -1; | |
102 | gpg.out = -1; | |
0c5e70f0 | 103 | args[0] = gpg_program; |
2f47eae2 JH |
104 | args[1] = "-bsau"; |
105 | args[2] = signing_key; | |
106 | args[3] = NULL; | |
107 | ||
108 | if (start_command(&gpg)) | |
109 | return error(_("could not run gpg.")); | |
110 | ||
111 | /* | |
112 | * When the username signingkey is bad, program could be terminated | |
113 | * because gpg exits without reading and then write gets SIGPIPE. | |
114 | */ | |
115 | sigchain_push(SIGPIPE, SIG_IGN); | |
116 | ||
117 | if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) { | |
118 | close(gpg.in); | |
119 | close(gpg.out); | |
120 | finish_command(&gpg); | |
121 | return error(_("gpg did not accept the data")); | |
122 | } | |
123 | close(gpg.in); | |
124 | ||
125 | bottom = signature->len; | |
126 | len = strbuf_read(signature, gpg.out, 1024); | |
127 | close(gpg.out); | |
128 | ||
129 | sigchain_pop(SIGPIPE); | |
130 | ||
131 | if (finish_command(&gpg) || !len || len < 0) | |
132 | return error(_("gpg failed to sign the data")); | |
133 | ||
134 | /* Strip CR from the line endings, in case we are on Windows. */ | |
135 | for (i = j = bottom; i < signature->len; i++) | |
136 | if (signature->buf[i] != '\r') { | |
137 | if (i != j) | |
138 | signature->buf[j] = signature->buf[i]; | |
139 | j++; | |
140 | } | |
141 | strbuf_setlen(signature, j); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Run "gpg" to see if the payload matches the detached signature. | |
e3f55e07 | 148 | * gpg_output, when set, receives the diagnostic output from GPG. |
b60b7566 | 149 | * gpg_status, when set, receives the status output from GPG. |
2f47eae2 JH |
150 | */ |
151 | int verify_signed_buffer(const char *payload, size_t payload_size, | |
152 | const char *signature, size_t signature_size, | |
9cc4ac8f | 153 | struct strbuf *gpg_output, struct strbuf *gpg_status) |
2f47eae2 JH |
154 | { |
155 | struct child_process gpg; | |
b60b7566 | 156 | const char *args_gpg[] = {NULL, "--status-fd=1", "--verify", "FILE", "-", NULL}; |
2f47eae2 JH |
157 | char path[PATH_MAX]; |
158 | int fd, ret; | |
b60b7566 | 159 | struct strbuf buf = STRBUF_INIT; |
9cc4ac8f | 160 | struct strbuf *pbuf = &buf; |
2f47eae2 | 161 | |
0c5e70f0 | 162 | args_gpg[0] = gpg_program; |
2f47eae2 JH |
163 | fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX"); |
164 | if (fd < 0) | |
4c9a4182 | 165 | return error(_("could not create temporary file '%s': %s"), |
2f47eae2 JH |
166 | path, strerror(errno)); |
167 | if (write_in_full(fd, signature, signature_size) < 0) | |
4c9a4182 | 168 | return error(_("failed writing detached signature to '%s': %s"), |
2f47eae2 JH |
169 | path, strerror(errno)); |
170 | close(fd); | |
171 | ||
172 | memset(&gpg, 0, sizeof(gpg)); | |
173 | gpg.argv = args_gpg; | |
174 | gpg.in = -1; | |
b60b7566 | 175 | gpg.out = -1; |
2f47eae2 JH |
176 | if (gpg_output) |
177 | gpg.err = -1; | |
b60b7566 | 178 | args_gpg[3] = path; |
2f47eae2 JH |
179 | if (start_command(&gpg)) { |
180 | unlink(path); | |
4c9a4182 | 181 | return error(_("could not run gpg.")); |
2f47eae2 JH |
182 | } |
183 | ||
184 | write_in_full(gpg.in, payload, payload_size); | |
185 | close(gpg.in); | |
186 | ||
7dac3f83 | 187 | if (gpg_output) { |
2f47eae2 | 188 | strbuf_read(gpg_output, gpg.err, 0); |
7dac3f83 SB |
189 | close(gpg.err); |
190 | } | |
9cc4ac8f MG |
191 | if (gpg_status) |
192 | pbuf = gpg_status; | |
193 | strbuf_read(pbuf, gpg.out, 0); | |
b60b7566 MG |
194 | close(gpg.out); |
195 | ||
2f47eae2 JH |
196 | ret = finish_command(&gpg); |
197 | ||
198 | unlink_or_warn(path); | |
199 | ||
9cc4ac8f MG |
200 | ret |= !strstr(pbuf->buf, "\n[GNUPG:] GOODSIG "); |
201 | strbuf_release(&buf); /* no matter it was used or not */ | |
b60b7566 | 202 | |
2f47eae2 JH |
203 | return ret; |
204 | } |