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abca927d JK |
1 | #include "cache.h" |
2 | #include "credential.h" | |
3 | #include "string-list.h" | |
4 | #include "run-command.h" | |
d3e847c1 | 5 | #include "url.h" |
d3c58b83 | 6 | #include "prompt.h" |
abca927d JK |
7 | |
8 | void credential_init(struct credential *c) | |
9 | { | |
10 | memset(c, 0, sizeof(*c)); | |
11 | c->helpers.strdup_strings = 1; | |
12 | } | |
13 | ||
14 | void credential_clear(struct credential *c) | |
15 | { | |
16 | free(c->protocol); | |
17 | free(c->host); | |
18 | free(c->path); | |
19 | free(c->username); | |
20 | free(c->password); | |
21 | string_list_clear(&c->helpers, 0); | |
22 | ||
23 | credential_init(c); | |
24 | } | |
25 | ||
11825072 JK |
26 | int credential_match(const struct credential *want, |
27 | const struct credential *have) | |
28 | { | |
29 | #define CHECK(x) (!want->x || (have->x && !strcmp(want->x, have->x))) | |
30 | return CHECK(protocol) && | |
31 | CHECK(host) && | |
32 | CHECK(path) && | |
33 | CHECK(username); | |
34 | #undef CHECK | |
35 | } | |
36 | ||
37 | static int credential_config_callback(const char *var, const char *value, | |
38 | void *data) | |
39 | { | |
40 | struct credential *c = data; | |
41 | const char *key, *dot; | |
42 | ||
43 | key = skip_prefix(var, "credential."); | |
44 | if (!key) | |
45 | return 0; | |
46 | ||
47 | if (!value) | |
48 | return config_error_nonbool(var); | |
49 | ||
50 | dot = strrchr(key, '.'); | |
51 | if (dot) { | |
52 | struct credential want = CREDENTIAL_INIT; | |
53 | char *url = xmemdupz(key, dot - key); | |
54 | int matched; | |
55 | ||
56 | credential_from_url(&want, url); | |
57 | matched = credential_match(&want, c); | |
58 | ||
59 | credential_clear(&want); | |
60 | free(url); | |
61 | ||
62 | if (!matched) | |
63 | return 0; | |
64 | key = dot + 1; | |
65 | } | |
66 | ||
67 | if (!strcmp(key, "helper")) | |
68 | string_list_append(&c->helpers, value); | |
d5742425 JK |
69 | else if (!strcmp(key, "username")) { |
70 | if (!c->username) | |
71 | c->username = xstrdup(value); | |
72 | } | |
a78fbb4f JK |
73 | else if (!strcmp(key, "usehttppath")) |
74 | c->use_http_path = git_config_bool(var, value); | |
11825072 JK |
75 | |
76 | return 0; | |
77 | } | |
78 | ||
a78fbb4f JK |
79 | static int proto_is_http(const char *s) |
80 | { | |
81 | if (!s) | |
82 | return 0; | |
83 | return !strcmp(s, "https") || !strcmp(s, "http"); | |
84 | } | |
85 | ||
11825072 JK |
86 | static void credential_apply_config(struct credential *c) |
87 | { | |
88 | if (c->configured) | |
89 | return; | |
90 | git_config(credential_config_callback, c); | |
91 | c->configured = 1; | |
a78fbb4f JK |
92 | |
93 | if (!c->use_http_path && proto_is_http(c->protocol)) { | |
94 | free(c->path); | |
95 | c->path = NULL; | |
96 | } | |
11825072 JK |
97 | } |
98 | ||
abca927d JK |
99 | static void credential_describe(struct credential *c, struct strbuf *out) |
100 | { | |
101 | if (!c->protocol) | |
102 | return; | |
103 | strbuf_addf(out, "%s://", c->protocol); | |
104 | if (c->username && *c->username) | |
105 | strbuf_addf(out, "%s@", c->username); | |
106 | if (c->host) | |
107 | strbuf_addstr(out, c->host); | |
108 | if (c->path) | |
109 | strbuf_addf(out, "/%s", c->path); | |
110 | } | |
111 | ||
ce77aa48 JK |
112 | static char *credential_ask_one(const char *what, struct credential *c, |
113 | int flags) | |
abca927d JK |
114 | { |
115 | struct strbuf desc = STRBUF_INIT; | |
116 | struct strbuf prompt = STRBUF_INIT; | |
117 | char *r; | |
118 | ||
119 | credential_describe(c, &desc); | |
120 | if (desc.len) | |
121 | strbuf_addf(&prompt, "%s for '%s': ", what, desc.buf); | |
122 | else | |
123 | strbuf_addf(&prompt, "%s: ", what); | |
124 | ||
ce77aa48 | 125 | r = git_prompt(prompt.buf, flags); |
abca927d JK |
126 | |
127 | strbuf_release(&desc); | |
128 | strbuf_release(&prompt); | |
129 | return xstrdup(r); | |
130 | } | |
131 | ||
132 | static void credential_getpass(struct credential *c) | |
133 | { | |
134 | if (!c->username) | |
ce77aa48 JK |
135 | c->username = credential_ask_one("Username", c, |
136 | PROMPT_ASKPASS|PROMPT_ECHO); | |
abca927d | 137 | if (!c->password) |
ce77aa48 JK |
138 | c->password = credential_ask_one("Password", c, |
139 | PROMPT_ASKPASS); | |
abca927d JK |
140 | } |
141 | ||
142 | int credential_read(struct credential *c, FILE *fp) | |
143 | { | |
144 | struct strbuf line = STRBUF_INIT; | |
145 | ||
146 | while (strbuf_getline(&line, fp, '\n') != EOF) { | |
147 | char *key = line.buf; | |
148 | char *value = strchr(key, '='); | |
149 | ||
150 | if (!line.len) | |
151 | break; | |
152 | ||
153 | if (!value) { | |
154 | warning("invalid credential line: %s", key); | |
155 | strbuf_release(&line); | |
156 | return -1; | |
157 | } | |
158 | *value++ = '\0'; | |
159 | ||
160 | if (!strcmp(key, "username")) { | |
161 | free(c->username); | |
162 | c->username = xstrdup(value); | |
163 | } else if (!strcmp(key, "password")) { | |
164 | free(c->password); | |
165 | c->password = xstrdup(value); | |
166 | } else if (!strcmp(key, "protocol")) { | |
167 | free(c->protocol); | |
168 | c->protocol = xstrdup(value); | |
169 | } else if (!strcmp(key, "host")) { | |
170 | free(c->host); | |
171 | c->host = xstrdup(value); | |
172 | } else if (!strcmp(key, "path")) { | |
173 | free(c->path); | |
174 | c->path = xstrdup(value); | |
175 | } | |
176 | /* | |
177 | * Ignore other lines; we don't know what they mean, but | |
178 | * this future-proofs us when later versions of git do | |
179 | * learn new lines, and the helpers are updated to match. | |
180 | */ | |
181 | } | |
182 | ||
183 | strbuf_release(&line); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static void credential_write_item(FILE *fp, const char *key, const char *value) | |
188 | { | |
189 | if (!value) | |
190 | return; | |
191 | fprintf(fp, "%s=%s\n", key, value); | |
192 | } | |
193 | ||
194 | static void credential_write(const struct credential *c, FILE *fp) | |
195 | { | |
196 | credential_write_item(fp, "protocol", c->protocol); | |
197 | credential_write_item(fp, "host", c->host); | |
198 | credential_write_item(fp, "path", c->path); | |
199 | credential_write_item(fp, "username", c->username); | |
200 | credential_write_item(fp, "password", c->password); | |
201 | } | |
202 | ||
203 | static int run_credential_helper(struct credential *c, | |
204 | const char *cmd, | |
205 | int want_output) | |
206 | { | |
207 | struct child_process helper; | |
208 | const char *argv[] = { NULL, NULL }; | |
209 | FILE *fp; | |
210 | ||
211 | memset(&helper, 0, sizeof(helper)); | |
212 | argv[0] = cmd; | |
213 | helper.argv = argv; | |
214 | helper.use_shell = 1; | |
215 | helper.in = -1; | |
216 | if (want_output) | |
217 | helper.out = -1; | |
218 | else | |
219 | helper.no_stdout = 1; | |
220 | ||
221 | if (start_command(&helper) < 0) | |
222 | return -1; | |
223 | ||
224 | fp = xfdopen(helper.in, "w"); | |
225 | credential_write(c, fp); | |
226 | fclose(fp); | |
227 | ||
228 | if (want_output) { | |
229 | int r; | |
230 | fp = xfdopen(helper.out, "r"); | |
231 | r = credential_read(c, fp); | |
232 | fclose(fp); | |
233 | if (r < 0) { | |
234 | finish_command(&helper); | |
235 | return -1; | |
236 | } | |
237 | } | |
238 | ||
239 | if (finish_command(&helper)) | |
240 | return -1; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int credential_do(struct credential *c, const char *helper, | |
245 | const char *operation) | |
246 | { | |
247 | struct strbuf cmd = STRBUF_INIT; | |
248 | int r; | |
249 | ||
250 | if (helper[0] == '!') | |
251 | strbuf_addstr(&cmd, helper + 1); | |
252 | else if (is_absolute_path(helper)) | |
253 | strbuf_addstr(&cmd, helper); | |
254 | else | |
255 | strbuf_addf(&cmd, "git credential-%s", helper); | |
256 | ||
257 | strbuf_addf(&cmd, " %s", operation); | |
258 | r = run_credential_helper(c, cmd.buf, !strcmp(operation, "get")); | |
259 | ||
260 | strbuf_release(&cmd); | |
261 | return r; | |
262 | } | |
263 | ||
264 | void credential_fill(struct credential *c) | |
265 | { | |
266 | int i; | |
267 | ||
268 | if (c->username && c->password) | |
269 | return; | |
270 | ||
11825072 JK |
271 | credential_apply_config(c); |
272 | ||
abca927d JK |
273 | for (i = 0; i < c->helpers.nr; i++) { |
274 | credential_do(c, c->helpers.items[i].string, "get"); | |
275 | if (c->username && c->password) | |
276 | return; | |
277 | } | |
278 | ||
279 | credential_getpass(c); | |
280 | if (!c->username && !c->password) | |
281 | die("unable to get password from user"); | |
282 | } | |
283 | ||
284 | void credential_approve(struct credential *c) | |
285 | { | |
286 | int i; | |
287 | ||
288 | if (c->approved) | |
289 | return; | |
290 | if (!c->username || !c->password) | |
291 | return; | |
292 | ||
11825072 JK |
293 | credential_apply_config(c); |
294 | ||
abca927d JK |
295 | for (i = 0; i < c->helpers.nr; i++) |
296 | credential_do(c, c->helpers.items[i].string, "store"); | |
297 | c->approved = 1; | |
298 | } | |
299 | ||
300 | void credential_reject(struct credential *c) | |
301 | { | |
302 | int i; | |
303 | ||
11825072 JK |
304 | credential_apply_config(c); |
305 | ||
abca927d JK |
306 | for (i = 0; i < c->helpers.nr; i++) |
307 | credential_do(c, c->helpers.items[i].string, "erase"); | |
308 | ||
309 | free(c->username); | |
310 | c->username = NULL; | |
311 | free(c->password); | |
312 | c->password = NULL; | |
313 | c->approved = 0; | |
314 | } | |
d3e847c1 JK |
315 | |
316 | void credential_from_url(struct credential *c, const char *url) | |
317 | { | |
318 | const char *at, *colon, *cp, *slash, *host, *proto_end; | |
319 | ||
320 | credential_clear(c); | |
321 | ||
322 | /* | |
323 | * Match one of: | |
324 | * (1) proto://<host>/... | |
325 | * (2) proto://<user>@<host>/... | |
326 | * (3) proto://<user>:<pass>@<host>/... | |
327 | */ | |
328 | proto_end = strstr(url, "://"); | |
329 | if (!proto_end) | |
330 | return; | |
331 | cp = proto_end + 3; | |
332 | at = strchr(cp, '@'); | |
333 | colon = strchr(cp, ':'); | |
334 | slash = strchrnul(cp, '/'); | |
335 | ||
336 | if (!at || slash <= at) { | |
337 | /* Case (1) */ | |
338 | host = cp; | |
339 | } | |
340 | else if (!colon || at <= colon) { | |
341 | /* Case (2) */ | |
342 | c->username = url_decode_mem(cp, at - cp); | |
343 | host = at + 1; | |
344 | } else { | |
345 | /* Case (3) */ | |
346 | c->username = url_decode_mem(cp, colon - cp); | |
347 | c->password = url_decode_mem(colon + 1, at - (colon + 1)); | |
348 | host = at + 1; | |
349 | } | |
350 | ||
351 | if (proto_end - url > 0) | |
352 | c->protocol = xmemdupz(url, proto_end - url); | |
353 | if (slash - host > 0) | |
354 | c->host = url_decode_mem(host, slash - host); | |
355 | /* Trim leading and trailing slashes from path */ | |
356 | while (*slash == '/') | |
357 | slash++; | |
358 | if (*slash) { | |
359 | char *p; | |
360 | c->path = url_decode(slash); | |
361 | p = c->path + strlen(c->path) - 1; | |
362 | while (p > c->path && *p == '/') | |
363 | *p-- = '\0'; | |
364 | } | |
365 | } |