Merge branch 'rs/commit-export-env-simplify'
[git] / credential-store.c
1 #include "cache.h"
2 #include "lockfile.h"
3 #include "credential.h"
4 #include "string-list.h"
5 #include "parse-options.h"
6
7 static struct lock_file credential_lock;
8
9 static int parse_credential_file(const char *fn,
10                                   struct credential *c,
11                                   void (*match_cb)(struct credential *),
12                                   void (*other_cb)(struct strbuf *))
13 {
14         FILE *fh;
15         struct strbuf line = STRBUF_INIT;
16         struct credential entry = CREDENTIAL_INIT;
17         int found_credential = 0;
18
19         fh = fopen(fn, "r");
20         if (!fh) {
21                 if (errno != ENOENT && errno != EACCES)
22                         die_errno("unable to open %s", fn);
23                 return found_credential;
24         }
25
26         while (strbuf_getline_lf(&line, fh) != EOF) {
27                 credential_from_url(&entry, line.buf);
28                 if (entry.username && entry.password &&
29                     credential_match(c, &entry)) {
30                         found_credential = 1;
31                         if (match_cb) {
32                                 match_cb(&entry);
33                                 break;
34                         }
35                 }
36                 else if (other_cb)
37                         other_cb(&line);
38         }
39
40         credential_clear(&entry);
41         strbuf_release(&line);
42         fclose(fh);
43         return found_credential;
44 }
45
46 static void print_entry(struct credential *c)
47 {
48         printf("username=%s\n", c->username);
49         printf("password=%s\n", c->password);
50 }
51
52 static void print_line(struct strbuf *buf)
53 {
54         strbuf_addch(buf, '\n');
55         write_or_die(get_lock_file_fd(&credential_lock), buf->buf, buf->len);
56 }
57
58 static void rewrite_credential_file(const char *fn, struct credential *c,
59                                     struct strbuf *extra)
60 {
61         if (hold_lock_file_for_update(&credential_lock, fn, 0) < 0)
62                 die_errno("unable to get credential storage lock");
63         if (extra)
64                 print_line(extra);
65         parse_credential_file(fn, c, NULL, print_line);
66         if (commit_lock_file(&credential_lock) < 0)
67                 die_errno("unable to write credential store");
68 }
69
70 static void store_credential_file(const char *fn, struct credential *c)
71 {
72         struct strbuf buf = STRBUF_INIT;
73
74         strbuf_addf(&buf, "%s://", c->protocol);
75         strbuf_addstr_urlencode(&buf, c->username, is_rfc3986_unreserved);
76         strbuf_addch(&buf, ':');
77         strbuf_addstr_urlencode(&buf, c->password, is_rfc3986_unreserved);
78         strbuf_addch(&buf, '@');
79         if (c->host)
80                 strbuf_addstr_urlencode(&buf, c->host, is_rfc3986_unreserved);
81         if (c->path) {
82                 strbuf_addch(&buf, '/');
83                 strbuf_addstr_urlencode(&buf, c->path,
84                                         is_rfc3986_reserved_or_unreserved);
85         }
86
87         rewrite_credential_file(fn, c, &buf);
88         strbuf_release(&buf);
89 }
90
91 static void store_credential(const struct string_list *fns, struct credential *c)
92 {
93         struct string_list_item *fn;
94
95         /*
96          * Sanity check that what we are storing is actually sensible.
97          * In particular, we can't make a URL without a protocol field.
98          * Without either a host or pathname (depending on the scheme),
99          * we have no primary key. And without a username and password,
100          * we are not actually storing a credential.
101          */
102         if (!c->protocol || !(c->host || c->path) || !c->username || !c->password)
103                 return;
104
105         for_each_string_list_item(fn, fns)
106                 if (!access(fn->string, F_OK)) {
107                         store_credential_file(fn->string, c);
108                         return;
109                 }
110         /*
111          * Write credential to the filename specified by fns->items[0], thus
112          * creating it
113          */
114         if (fns->nr)
115                 store_credential_file(fns->items[0].string, c);
116 }
117
118 static void remove_credential(const struct string_list *fns, struct credential *c)
119 {
120         struct string_list_item *fn;
121
122         /*
123          * Sanity check that we actually have something to match
124          * against. The input we get is a restrictive pattern,
125          * so technically a blank credential means "erase everything".
126          * But it is too easy to accidentally send this, since it is equivalent
127          * to empty input. So explicitly disallow it, and require that the
128          * pattern have some actual content to match.
129          */
130         if (!c->protocol && !c->host && !c->path && !c->username)
131                 return;
132         for_each_string_list_item(fn, fns)
133                 if (!access(fn->string, F_OK))
134                         rewrite_credential_file(fn->string, c, NULL);
135 }
136
137 static void lookup_credential(const struct string_list *fns, struct credential *c)
138 {
139         struct string_list_item *fn;
140
141         for_each_string_list_item(fn, fns)
142                 if (parse_credential_file(fn->string, c, print_entry, NULL))
143                         return; /* Found credential */
144 }
145
146 int cmd_main(int argc, const char **argv)
147 {
148         const char * const usage[] = {
149                 "git credential-store [<options>] <action>",
150                 NULL
151         };
152         const char *op;
153         struct credential c = CREDENTIAL_INIT;
154         struct string_list fns = STRING_LIST_INIT_DUP;
155         char *file = NULL;
156         struct option options[] = {
157                 OPT_STRING(0, "file", &file, "path",
158                            "fetch and store credentials in <path>"),
159                 OPT_END()
160         };
161
162         umask(077);
163
164         argc = parse_options(argc, (const char **)argv, NULL, options, usage, 0);
165         if (argc != 1)
166                 usage_with_options(usage, options);
167         op = argv[0];
168
169         if (file) {
170                 string_list_append(&fns, file);
171         } else {
172                 if ((file = expand_user_path("~/.git-credentials", 0)))
173                         string_list_append_nodup(&fns, file);
174                 file = xdg_config_home("credentials");
175                 if (file)
176                         string_list_append_nodup(&fns, file);
177         }
178         if (!fns.nr)
179                 die("unable to set up default path; use --file");
180
181         if (credential_read(&c, stdin) < 0)
182                 die("unable to read credential");
183
184         if (!strcmp(op, "get"))
185                 lookup_credential(&fns, &c);
186         else if (!strcmp(op, "erase"))
187                 remove_credential(&fns, &c);
188         else if (!strcmp(op, "store"))
189                 store_credential(&fns, &c);
190         else
191                 ; /* Ignore unknown operation. */
192
193         string_list_clear(&fns, 0);
194         return 0;
195 }