http: use credential API to get passwords
[git/git.git] / credential.c
CommitLineData
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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"
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6
7void credential_init(struct credential *c)
8{
9 memset(c, 0, sizeof(*c));
10 c->helpers.strdup_strings = 1;
11}
12
13void credential_clear(struct credential *c)
14{
15 free(c->protocol);
16 free(c->host);
17 free(c->path);
18 free(c->username);
19 free(c->password);
20 string_list_clear(&c->helpers, 0);
21
22 credential_init(c);
23}
24
25static void credential_describe(struct credential *c, struct strbuf *out)
26{
27 if (!c->protocol)
28 return;
29 strbuf_addf(out, "%s://", c->protocol);
30 if (c->username && *c->username)
31 strbuf_addf(out, "%s@", c->username);
32 if (c->host)
33 strbuf_addstr(out, c->host);
34 if (c->path)
35 strbuf_addf(out, "/%s", c->path);
36}
37
38static char *credential_ask_one(const char *what, struct credential *c)
39{
40 struct strbuf desc = STRBUF_INIT;
41 struct strbuf prompt = STRBUF_INIT;
42 char *r;
43
44 credential_describe(c, &desc);
45 if (desc.len)
46 strbuf_addf(&prompt, "%s for '%s': ", what, desc.buf);
47 else
48 strbuf_addf(&prompt, "%s: ", what);
49
50 /* FIXME: for usernames, we should do something less magical that
51 * actually echoes the characters. However, we need to read from
52 * /dev/tty and not stdio, which is not portable (but getpass will do
53 * it for us). http.c uses the same workaround. */
54 r = git_getpass(prompt.buf);
55
56 strbuf_release(&desc);
57 strbuf_release(&prompt);
58 return xstrdup(r);
59}
60
61static void credential_getpass(struct credential *c)
62{
63 if (!c->username)
64 c->username = credential_ask_one("Username", c);
65 if (!c->password)
66 c->password = credential_ask_one("Password", c);
67}
68
69int credential_read(struct credential *c, FILE *fp)
70{
71 struct strbuf line = STRBUF_INIT;
72
73 while (strbuf_getline(&line, fp, '\n') != EOF) {
74 char *key = line.buf;
75 char *value = strchr(key, '=');
76
77 if (!line.len)
78 break;
79
80 if (!value) {
81 warning("invalid credential line: %s", key);
82 strbuf_release(&line);
83 return -1;
84 }
85 *value++ = '\0';
86
87 if (!strcmp(key, "username")) {
88 free(c->username);
89 c->username = xstrdup(value);
90 } else if (!strcmp(key, "password")) {
91 free(c->password);
92 c->password = xstrdup(value);
93 } else if (!strcmp(key, "protocol")) {
94 free(c->protocol);
95 c->protocol = xstrdup(value);
96 } else if (!strcmp(key, "host")) {
97 free(c->host);
98 c->host = xstrdup(value);
99 } else if (!strcmp(key, "path")) {
100 free(c->path);
101 c->path = xstrdup(value);
102 }
103 /*
104 * Ignore other lines; we don't know what they mean, but
105 * this future-proofs us when later versions of git do
106 * learn new lines, and the helpers are updated to match.
107 */
108 }
109
110 strbuf_release(&line);
111 return 0;
112}
113
114static void credential_write_item(FILE *fp, const char *key, const char *value)
115{
116 if (!value)
117 return;
118 fprintf(fp, "%s=%s\n", key, value);
119}
120
121static void credential_write(const struct credential *c, FILE *fp)
122{
123 credential_write_item(fp, "protocol", c->protocol);
124 credential_write_item(fp, "host", c->host);
125 credential_write_item(fp, "path", c->path);
126 credential_write_item(fp, "username", c->username);
127 credential_write_item(fp, "password", c->password);
128}
129
130static int run_credential_helper(struct credential *c,
131 const char *cmd,
132 int want_output)
133{
134 struct child_process helper;
135 const char *argv[] = { NULL, NULL };
136 FILE *fp;
137
138 memset(&helper, 0, sizeof(helper));
139 argv[0] = cmd;
140 helper.argv = argv;
141 helper.use_shell = 1;
142 helper.in = -1;
143 if (want_output)
144 helper.out = -1;
145 else
146 helper.no_stdout = 1;
147
148 if (start_command(&helper) < 0)
149 return -1;
150
151 fp = xfdopen(helper.in, "w");
152 credential_write(c, fp);
153 fclose(fp);
154
155 if (want_output) {
156 int r;
157 fp = xfdopen(helper.out, "r");
158 r = credential_read(c, fp);
159 fclose(fp);
160 if (r < 0) {
161 finish_command(&helper);
162 return -1;
163 }
164 }
165
166 if (finish_command(&helper))
167 return -1;
168 return 0;
169}
170
171static int credential_do(struct credential *c, const char *helper,
172 const char *operation)
173{
174 struct strbuf cmd = STRBUF_INIT;
175 int r;
176
177 if (helper[0] == '!')
178 strbuf_addstr(&cmd, helper + 1);
179 else if (is_absolute_path(helper))
180 strbuf_addstr(&cmd, helper);
181 else
182 strbuf_addf(&cmd, "git credential-%s", helper);
183
184 strbuf_addf(&cmd, " %s", operation);
185 r = run_credential_helper(c, cmd.buf, !strcmp(operation, "get"));
186
187 strbuf_release(&cmd);
188 return r;
189}
190
191void credential_fill(struct credential *c)
192{
193 int i;
194
195 if (c->username && c->password)
196 return;
197
198 for (i = 0; i < c->helpers.nr; i++) {
199 credential_do(c, c->helpers.items[i].string, "get");
200 if (c->username && c->password)
201 return;
202 }
203
204 credential_getpass(c);
205 if (!c->username && !c->password)
206 die("unable to get password from user");
207}
208
209void credential_approve(struct credential *c)
210{
211 int i;
212
213 if (c->approved)
214 return;
215 if (!c->username || !c->password)
216 return;
217
218 for (i = 0; i < c->helpers.nr; i++)
219 credential_do(c, c->helpers.items[i].string, "store");
220 c->approved = 1;
221}
222
223void credential_reject(struct credential *c)
224{
225 int i;
226
227 for (i = 0; i < c->helpers.nr; i++)
228 credential_do(c, c->helpers.items[i].string, "erase");
229
230 free(c->username);
231 c->username = NULL;
232 free(c->password);
233 c->password = NULL;
234 c->approved = 0;
235}
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236
237void credential_from_url(struct credential *c, const char *url)
238{
239 const char *at, *colon, *cp, *slash, *host, *proto_end;
240
241 credential_clear(c);
242
243 /*
244 * Match one of:
245 * (1) proto://<host>/...
246 * (2) proto://<user>@<host>/...
247 * (3) proto://<user>:<pass>@<host>/...
248 */
249 proto_end = strstr(url, "://");
250 if (!proto_end)
251 return;
252 cp = proto_end + 3;
253 at = strchr(cp, '@');
254 colon = strchr(cp, ':');
255 slash = strchrnul(cp, '/');
256
257 if (!at || slash <= at) {
258 /* Case (1) */
259 host = cp;
260 }
261 else if (!colon || at <= colon) {
262 /* Case (2) */
263 c->username = url_decode_mem(cp, at - cp);
264 host = at + 1;
265 } else {
266 /* Case (3) */
267 c->username = url_decode_mem(cp, colon - cp);
268 c->password = url_decode_mem(colon + 1, at - (colon + 1));
269 host = at + 1;
270 }
271
272 if (proto_end - url > 0)
273 c->protocol = xmemdupz(url, proto_end - url);
274 if (slash - host > 0)
275 c->host = url_decode_mem(host, slash - host);
276 /* Trim leading and trailing slashes from path */
277 while (*slash == '/')
278 slash++;
279 if (*slash) {
280 char *p;
281 c->path = url_decode(slash);
282 p = c->path + strlen(c->path) - 1;
283 while (p > c->path && *p == '/')
284 *p-- = '\0';
285 }
286}