| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | #include "builtin.h" |
| 3 | #include "config.h" |
| 4 | #include "gettext.h" |
| 5 | #include "lockfile.h" |
| 6 | #include "credential.h" |
| 7 | #include "path.h" |
| 8 | #include "string-list.h" |
| 9 | #include "parse-options.h" |
| 10 | #include "url.h" |
| 11 | #include "write-or-die.h" |
| 12 | |
| 13 | static struct lock_file credential_lock; |
| 14 | |
| 15 | static int parse_credential_file(const char *fn, |
| 16 | struct credential *c, |
| 17 | void (*match_cb)(struct credential *), |
| 18 | void (*other_cb)(struct strbuf *), |
| 19 | int match_password) |
| 20 | { |
| 21 | FILE *fh; |
| 22 | struct strbuf line = STRBUF_INIT; |
| 23 | struct credential entry = CREDENTIAL_INIT; |
| 24 | int found_credential = 0; |
| 25 | |
| 26 | fh = fopen(fn, "r"); |
| 27 | if (!fh) { |
| 28 | if (errno != ENOENT && errno != EACCES) |
| 29 | die_errno("unable to open %s", fn); |
| 30 | return found_credential; |
| 31 | } |
| 32 | |
| 33 | while (strbuf_getline_lf(&line, fh) != EOF) { |
| 34 | if (!credential_from_url_gently(&entry, line.buf, 1) && |
| 35 | entry.username && entry.password && |
| 36 | credential_match(c, &entry, match_password)) { |
| 37 | found_credential = 1; |
| 38 | if (match_cb) { |
| 39 | match_cb(&entry); |
| 40 | break; |
| 41 | } |
| 42 | } |
| 43 | else if (other_cb) |
| 44 | other_cb(&line); |
| 45 | } |
| 46 | |
| 47 | credential_clear(&entry); |
| 48 | strbuf_release(&line); |
| 49 | fclose(fh); |
| 50 | return found_credential; |
| 51 | } |
| 52 | |
| 53 | static void print_entry(struct credential *c) |
| 54 | { |
| 55 | printf("username=%s\n", c->username); |
| 56 | printf("password=%s\n", c->password); |
| 57 | } |
| 58 | |
| 59 | static void print_line(struct strbuf *buf) |
| 60 | { |
| 61 | strbuf_addch(buf, '\n'); |
| 62 | write_or_die(get_lock_file_fd(&credential_lock), buf->buf, buf->len); |
| 63 | } |
| 64 | |
| 65 | static void rewrite_credential_file(const char *fn, struct credential *c, |
| 66 | struct strbuf *extra, int match_password) |
| 67 | { |
| 68 | int timeout_ms = 1000; |
| 69 | |
| 70 | repo_config_get_int(the_repository, "credentialstore.locktimeoutms", &timeout_ms); |
| 71 | if (hold_lock_file_for_update_timeout(&credential_lock, fn, 0, timeout_ms) < 0) |
| 72 | die_errno(_("unable to get credential storage lock in %d ms"), timeout_ms); |
| 73 | if (extra) |
| 74 | print_line(extra); |
| 75 | parse_credential_file(fn, c, NULL, print_line, match_password); |
| 76 | if (commit_lock_file(&credential_lock) < 0) |
| 77 | die_errno("unable to write credential store"); |
| 78 | } |
| 79 | |
| 80 | static int is_rfc3986_reserved_or_unreserved(char ch) |
| 81 | { |
| 82 | if (is_rfc3986_unreserved(ch)) |
| 83 | return 1; |
| 84 | switch (ch) { |
| 85 | case '!': case '*': case '\'': case '(': case ')': case ';': |
| 86 | case ':': case '@': case '&': case '=': case '+': case '$': |
| 87 | case ',': case '/': case '?': case '#': case '[': case ']': |
| 88 | return 1; |
| 89 | } |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static void store_credential_file(const char *fn, struct credential *c) |
| 94 | { |
| 95 | struct strbuf buf = STRBUF_INIT; |
| 96 | |
| 97 | strbuf_addf(&buf, "%s://", c->protocol); |
| 98 | strbuf_addstr_urlencode(&buf, c->username, is_rfc3986_unreserved); |
| 99 | strbuf_addch(&buf, ':'); |
| 100 | strbuf_addstr_urlencode(&buf, c->password, is_rfc3986_unreserved); |
| 101 | strbuf_addch(&buf, '@'); |
| 102 | if (c->host) |
| 103 | strbuf_addstr_urlencode(&buf, c->host, is_rfc3986_unreserved); |
| 104 | if (c->path) { |
| 105 | strbuf_addch(&buf, '/'); |
| 106 | strbuf_addstr_urlencode(&buf, c->path, |
| 107 | is_rfc3986_reserved_or_unreserved); |
| 108 | } |
| 109 | |
| 110 | rewrite_credential_file(fn, c, &buf, 0); |
| 111 | strbuf_release(&buf); |
| 112 | } |
| 113 | |
| 114 | static void store_credential(const struct string_list *fns, struct credential *c) |
| 115 | { |
| 116 | struct string_list_item *fn; |
| 117 | |
| 118 | /* |
| 119 | * Sanity check that what we are storing is actually sensible. |
| 120 | * In particular, we can't make a URL without a protocol field. |
| 121 | * Without either a host or pathname (depending on the scheme), |
| 122 | * we have no primary key. And without a username and password, |
| 123 | * we are not actually storing a credential. |
| 124 | */ |
| 125 | if (!c->protocol || !(c->host || c->path) || !c->username || !c->password) |
| 126 | return; |
| 127 | |
| 128 | for_each_string_list_item(fn, fns) |
| 129 | if (!access(fn->string, F_OK)) { |
| 130 | store_credential_file(fn->string, c); |
| 131 | return; |
| 132 | } |
| 133 | /* |
| 134 | * Write credential to the filename specified by fns->items[0], thus |
| 135 | * creating it |
| 136 | */ |
| 137 | if (fns->nr) |
| 138 | store_credential_file(fns->items[0].string, c); |
| 139 | } |
| 140 | |
| 141 | static void remove_credential(const struct string_list *fns, struct credential *c) |
| 142 | { |
| 143 | struct string_list_item *fn; |
| 144 | |
| 145 | /* |
| 146 | * Sanity check that we actually have something to match |
| 147 | * against. The input we get is a restrictive pattern, |
| 148 | * so technically a blank credential means "erase everything". |
| 149 | * But it is too easy to accidentally send this, since it is equivalent |
| 150 | * to empty input. So explicitly disallow it, and require that the |
| 151 | * pattern have some actual content to match. |
| 152 | */ |
| 153 | if (!c->protocol && !c->host && !c->path && !c->username) |
| 154 | return; |
| 155 | for_each_string_list_item(fn, fns) |
| 156 | if (!access(fn->string, F_OK)) |
| 157 | rewrite_credential_file(fn->string, c, NULL, 1); |
| 158 | } |
| 159 | |
| 160 | static void lookup_credential(const struct string_list *fns, struct credential *c) |
| 161 | { |
| 162 | struct string_list_item *fn; |
| 163 | |
| 164 | for_each_string_list_item(fn, fns) |
| 165 | if (parse_credential_file(fn->string, c, print_entry, NULL, 0)) |
| 166 | return; /* Found credential */ |
| 167 | } |
| 168 | |
| 169 | int cmd_credential_store(int argc, |
| 170 | const char **argv, |
| 171 | const char *prefix, |
| 172 | struct repository *repo UNUSED) |
| 173 | { |
| 174 | const char * const usage[] = { |
| 175 | "git credential-store [<options>] <action>", |
| 176 | NULL |
| 177 | }; |
| 178 | const char *op; |
| 179 | struct credential c = CREDENTIAL_INIT; |
| 180 | struct string_list fns = STRING_LIST_INIT_DUP; |
| 181 | char *file = NULL; |
| 182 | struct option options[] = { |
| 183 | OPT_STRING(0, "file", &file, "path", |
| 184 | "fetch and store credentials in <path>"), |
| 185 | OPT_END() |
| 186 | }; |
| 187 | |
| 188 | umask(077); |
| 189 | |
| 190 | argc = parse_options(argc, (const char **)argv, prefix, options, usage, 0); |
| 191 | if (argc != 1) |
| 192 | usage_with_options(usage, options); |
| 193 | op = argv[0]; |
| 194 | |
| 195 | if (file) { |
| 196 | string_list_append(&fns, file); |
| 197 | } else { |
| 198 | if ((file = interpolate_path("~/.git-credentials", 0))) |
| 199 | string_list_append_nodup(&fns, file); |
| 200 | file = xdg_config_home("credentials"); |
| 201 | if (file) |
| 202 | string_list_append_nodup(&fns, file); |
| 203 | } |
| 204 | if (!fns.nr) |
| 205 | die("unable to set up default path; use --file"); |
| 206 | |
| 207 | if (credential_read(&c, stdin, CREDENTIAL_OP_HELPER) < 0) |
| 208 | die("unable to read credential"); |
| 209 | |
| 210 | if (!strcmp(op, "get")) |
| 211 | lookup_credential(&fns, &c); |
| 212 | else if (!strcmp(op, "erase")) |
| 213 | remove_credential(&fns, &c); |
| 214 | else if (!strcmp(op, "store")) |
| 215 | store_credential(&fns, &c); |
| 216 | else |
| 217 | ; /* Ignore unknown operation. */ |
| 218 | |
| 219 | string_list_clear(&fns, 0); |
| 220 | credential_clear(&c); |
| 221 | return 0; |
| 222 | } |