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abca927 @peff introduce credentials API
peff authored
1 #include "cache.h"
2 #include "credential.h"
3 #include "string-list.h"
4 #include "run-command.h"
d3e847c @peff credential: add function for parsing url components
peff authored
5 #include "url.h"
d3c58b8 @peff move git_getpass to its own source file
peff authored
6 #include "prompt.h"
abca927 @peff introduce credentials API
peff authored
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
1182507 @peff credential: apply helper config
peff authored
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);
d574242 @peff credential: add credential.*.username
peff authored
69 else if (!strcmp(key, "username")) {
70 if (!c->username)
71 c->username = xstrdup(value);
72 }
a78fbb4 @peff credential: make relevance of http path configurable
peff authored
73 else if (!strcmp(key, "usehttppath"))
74 c->use_http_path = git_config_bool(var, value);
1182507 @peff credential: apply helper config
peff authored
75
76 return 0;
77 }
78
a78fbb4 @peff credential: make relevance of http path configurable
peff authored
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
1182507 @peff credential: apply helper config
peff authored
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;
a78fbb4 @peff credential: make relevance of http path configurable
peff authored
92
93 if (!c->use_http_path && proto_is_http(c->protocol)) {
94 free(c->path);
95 c->path = NULL;
96 }
1182507 @peff credential: apply helper config
peff authored
97 }
98
abca927 @peff introduce credentials API
peff authored
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
ce77aa4 @peff credential: use git_prompt instead of git_getpass
peff authored
112 static char *credential_ask_one(const char *what, struct credential *c,
113 int flags)
abca927 @peff introduce credentials API
peff authored
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
ce77aa4 @peff credential: use git_prompt instead of git_getpass
peff authored
125 r = git_prompt(prompt.buf, flags);
abca927 @peff introduce credentials API
peff authored
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)
ce77aa4 @peff credential: use git_prompt instead of git_getpass
peff authored
135 c->username = credential_ask_one("Username", c,
136 PROMPT_ASKPASS|PROMPT_ECHO);
abca927 @peff introduce credentials API
peff authored
137 if (!c->password)
ce77aa4 @peff credential: use git_prompt instead of git_getpass
peff authored
138 c->password = credential_ask_one("Password", c,
139 PROMPT_ASKPASS);
abca927 @peff introduce credentials API
peff authored
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);
9c183a7 @peff credential: convert "url" attribute into its parsed subparts
peff authored
175 } else if (!strcmp(key, "url")) {
176 credential_from_url(c, value);
abca927 @peff introduce credentials API
peff authored
177 }
178 /*
179 * Ignore other lines; we don't know what they mean, but
180 * this future-proofs us when later versions of git do
181 * learn new lines, and the helpers are updated to match.
182 */
183 }
184
185 strbuf_release(&line);
186 return 0;
187 }
188
189 static void credential_write_item(FILE *fp, const char *key, const char *value)
190 {
191 if (!value)
192 return;
193 fprintf(fp, "%s=%s\n", key, value);
194 }
195
2d6dc18 @moy git credential fill: output the whole 'struct credential'
moy authored
196 void credential_write(const struct credential *c, FILE *fp)
abca927 @peff introduce credentials API
peff authored
197 {
198 credential_write_item(fp, "protocol", c->protocol);
199 credential_write_item(fp, "host", c->host);
200 credential_write_item(fp, "path", c->path);
201 credential_write_item(fp, "username", c->username);
202 credential_write_item(fp, "password", c->password);
203 }
204
205 static int run_credential_helper(struct credential *c,
206 const char *cmd,
207 int want_output)
208 {
209 struct child_process helper;
210 const char *argv[] = { NULL, NULL };
211 FILE *fp;
212
213 memset(&helper, 0, sizeof(helper));
214 argv[0] = cmd;
215 helper.argv = argv;
216 helper.use_shell = 1;
217 helper.in = -1;
218 if (want_output)
219 helper.out = -1;
220 else
221 helper.no_stdout = 1;
222
223 if (start_command(&helper) < 0)
224 return -1;
225
226 fp = xfdopen(helper.in, "w");
227 credential_write(c, fp);
228 fclose(fp);
229
230 if (want_output) {
231 int r;
232 fp = xfdopen(helper.out, "r");
233 r = credential_read(c, fp);
234 fclose(fp);
235 if (r < 0) {
236 finish_command(&helper);
237 return -1;
238 }
239 }
240
241 if (finish_command(&helper))
242 return -1;
243 return 0;
244 }
245
246 static int credential_do(struct credential *c, const char *helper,
247 const char *operation)
248 {
249 struct strbuf cmd = STRBUF_INIT;
250 int r;
251
252 if (helper[0] == '!')
253 strbuf_addstr(&cmd, helper + 1);
254 else if (is_absolute_path(helper))
255 strbuf_addstr(&cmd, helper);
256 else
257 strbuf_addf(&cmd, "git credential-%s", helper);
258
259 strbuf_addf(&cmd, " %s", operation);
260 r = run_credential_helper(c, cmd.buf, !strcmp(operation, "get"));
261
262 strbuf_release(&cmd);
263 return r;
264 }
265
266 void credential_fill(struct credential *c)
267 {
268 int i;
269
270 if (c->username && c->password)
271 return;
272
1182507 @peff credential: apply helper config
peff authored
273 credential_apply_config(c);
274
abca927 @peff introduce credentials API
peff authored
275 for (i = 0; i < c->helpers.nr; i++) {
276 credential_do(c, c->helpers.items[i].string, "get");
277 if (c->username && c->password)
278 return;
279 }
280
281 credential_getpass(c);
282 if (!c->username && !c->password)
283 die("unable to get password from user");
284 }
285
286 void credential_approve(struct credential *c)
287 {
288 int i;
289
290 if (c->approved)
291 return;
292 if (!c->username || !c->password)
293 return;
294
1182507 @peff credential: apply helper config
peff authored
295 credential_apply_config(c);
296
abca927 @peff introduce credentials API
peff authored
297 for (i = 0; i < c->helpers.nr; i++)
298 credential_do(c, c->helpers.items[i].string, "store");
299 c->approved = 1;
300 }
301
302 void credential_reject(struct credential *c)
303 {
304 int i;
305
1182507 @peff credential: apply helper config
peff authored
306 credential_apply_config(c);
307
abca927 @peff introduce credentials API
peff authored
308 for (i = 0; i < c->helpers.nr; i++)
309 credential_do(c, c->helpers.items[i].string, "erase");
310
311 free(c->username);
312 c->username = NULL;
313 free(c->password);
314 c->password = NULL;
315 c->approved = 0;
316 }
d3e847c @peff credential: add function for parsing url components
peff authored
317
318 void credential_from_url(struct credential *c, const char *url)
319 {
320 const char *at, *colon, *cp, *slash, *host, *proto_end;
321
322 credential_clear(c);
323
324 /*
325 * Match one of:
326 * (1) proto://<host>/...
327 * (2) proto://<user>@<host>/...
328 * (3) proto://<user>:<pass>@<host>/...
329 */
330 proto_end = strstr(url, "://");
331 if (!proto_end)
332 return;
333 cp = proto_end + 3;
334 at = strchr(cp, '@');
335 colon = strchr(cp, ':');
336 slash = strchrnul(cp, '/');
337
338 if (!at || slash <= at) {
339 /* Case (1) */
340 host = cp;
341 }
342 else if (!colon || at <= colon) {
343 /* Case (2) */
344 c->username = url_decode_mem(cp, at - cp);
345 host = at + 1;
346 } else {
347 /* Case (3) */
348 c->username = url_decode_mem(cp, colon - cp);
349 c->password = url_decode_mem(colon + 1, at - (colon + 1));
350 host = at + 1;
351 }
352
353 if (proto_end - url > 0)
354 c->protocol = xmemdupz(url, proto_end - url);
355 if (slash - host > 0)
356 c->host = url_decode_mem(host, slash - host);
357 /* Trim leading and trailing slashes from path */
358 while (*slash == '/')
359 slash++;
360 if (*slash) {
361 char *p;
362 c->path = url_decode(slash);
363 p = c->path + strlen(c->path) - 1;
364 while (p > c->path && *p == '/')
365 *p-- = '\0';
366 }
367 }
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