avoid using skip_prefix as a boolean
[git/git.git] / credential.c
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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"
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7
8void credential_init(struct credential *c)
9{
10 memset(c, 0, sizeof(*c));
11 c->helpers.strdup_strings = 1;
12}
13
14void 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
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26int 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
37static 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);
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69 else if (!strcmp(key, "username")) {
70 if (!c->username)
71 c->username = xstrdup(value);
72 }
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73 else if (!strcmp(key, "usehttppath"))
74 c->use_http_path = git_config_bool(var, value);
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75
76 return 0;
77}
78
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79static int proto_is_http(const char *s)
80{
81 if (!s)
82 return 0;
83 return !strcmp(s, "https") || !strcmp(s, "http");
84}
85
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86static 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;
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92
93 if (!c->use_http_path && proto_is_http(c->protocol)) {
94 free(c->path);
95 c->path = NULL;
96 }
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97}
98
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99static 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
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112static char *credential_ask_one(const char *what, struct credential *c,
113 int flags)
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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);
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126
127 strbuf_release(&desc);
128 strbuf_release(&prompt);
129 return xstrdup(r);
130}
131
132static void credential_getpass(struct credential *c)
133{
134 if (!c->username)
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135 c->username = credential_ask_one("Username", c,
136 PROMPT_ASKPASS|PROMPT_ECHO);
abca927d 137 if (!c->password)
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138 c->password = credential_ask_one("Password", c,
139 PROMPT_ASKPASS);
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140}
141
142int 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);
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175 } else if (!strcmp(key, "url")) {
176 credential_from_url(c, value);
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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
189static 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
2d6dc182 196void credential_write(const struct credential *c, FILE *fp)
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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
205static 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
246static 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
266void credential_fill(struct credential *c)
267{
268 int i;
269
270 if (c->username && c->password)
271 return;
272
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273 credential_apply_config(c);
274
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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
286void 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
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295 credential_apply_config(c);
296
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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
302void credential_reject(struct credential *c)
303{
304 int i;
305
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306 credential_apply_config(c);
307
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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}
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317
318void 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}