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-rw-r--r--builtin/credential-store.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/builtin/credential-store.c b/builtin/credential-store.c
new file mode 100644
index 0000000..5331ab1
--- /dev/null
+++ b/builtin/credential-store.c
@@ -0,0 +1,195 @@
+#include "builtin.h"
+#include "lockfile.h"
+#include "credential.h"
+#include "string-list.h"
+#include "parse-options.h"
+
+static struct lock_file credential_lock;
+
+static int parse_credential_file(const char *fn,
+ struct credential *c,
+ void (*match_cb)(struct credential *),
+ void (*other_cb)(struct strbuf *))
+{
+ FILE *fh;
+ struct strbuf line = STRBUF_INIT;
+ struct credential entry = CREDENTIAL_INIT;
+ int found_credential = 0;
+
+ fh = fopen(fn, "r");
+ if (!fh) {
+ if (errno != ENOENT && errno != EACCES)
+ die_errno("unable to open %s", fn);
+ return found_credential;
+ }
+
+ while (strbuf_getline_lf(&line, fh) != EOF) {
+ if (!credential_from_url_gently(&entry, line.buf, 1) &&
+ entry.username && entry.password &&
+ credential_match(c, &entry)) {
+ found_credential = 1;
+ if (match_cb) {
+ match_cb(&entry);
+ break;
+ }
+ }
+ else if (other_cb)
+ other_cb(&line);
+ }
+
+ credential_clear(&entry);
+ strbuf_release(&line);
+ fclose(fh);
+ return found_credential;
+}
+
+static void print_entry(struct credential *c)
+{
+ printf("username=%s\n", c->username);
+ printf("password=%s\n", c->password);
+}
+
+static void print_line(struct strbuf *buf)
+{
+ strbuf_addch(buf, '\n');
+ write_or_die(get_lock_file_fd(&credential_lock), buf->buf, buf->len);
+}
+
+static void rewrite_credential_file(const char *fn, struct credential *c,
+ struct strbuf *extra)
+{
+ if (hold_lock_file_for_update(&credential_lock, fn, 0) < 0)
+ die_errno("unable to get credential storage lock");
+ if (extra)
+ print_line(extra);
+ parse_credential_file(fn, c, NULL, print_line);
+ if (commit_lock_file(&credential_lock) < 0)
+ die_errno("unable to write credential store");
+}
+
+static void store_credential_file(const char *fn, struct credential *c)
+{
+ struct strbuf buf = STRBUF_INIT;
+
+ strbuf_addf(&buf, "%s://", c->protocol);
+ strbuf_addstr_urlencode(&buf, c->username, is_rfc3986_unreserved);
+ strbuf_addch(&buf, ':');
+ strbuf_addstr_urlencode(&buf, c->password, is_rfc3986_unreserved);
+ strbuf_addch(&buf, '@');
+ if (c->host)
+ strbuf_addstr_urlencode(&buf, c->host, is_rfc3986_unreserved);
+ if (c->path) {
+ strbuf_addch(&buf, '/');
+ strbuf_addstr_urlencode(&buf, c->path,
+ is_rfc3986_reserved_or_unreserved);
+ }
+
+ rewrite_credential_file(fn, c, &buf);
+ strbuf_release(&buf);
+}
+
+static void store_credential(const struct string_list *fns, struct credential *c)
+{
+ struct string_list_item *fn;
+
+ /*
+ * Sanity check that what we are storing is actually sensible.
+ * In particular, we can't make a URL without a protocol field.
+ * Without either a host or pathname (depending on the scheme),
+ * we have no primary key. And without a username and password,
+ * we are not actually storing a credential.
+ */
+ if (!c->protocol || !(c->host || c->path) || !c->username || !c->password)
+ return;
+
+ for_each_string_list_item(fn, fns)
+ if (!access(fn->string, F_OK)) {
+ store_credential_file(fn->string, c);
+ return;
+ }
+ /*
+ * Write credential to the filename specified by fns->items[0], thus
+ * creating it
+ */
+ if (fns->nr)
+ store_credential_file(fns->items[0].string, c);
+}
+
+static void remove_credential(const struct string_list *fns, struct credential *c)
+{
+ struct string_list_item *fn;
+
+ /*
+ * Sanity check that we actually have something to match
+ * against. The input we get is a restrictive pattern,
+ * so technically a blank credential means "erase everything".
+ * But it is too easy to accidentally send this, since it is equivalent
+ * to empty input. So explicitly disallow it, and require that the
+ * pattern have some actual content to match.
+ */
+ if (!c->protocol && !c->host && !c->path && !c->username)
+ return;
+ for_each_string_list_item(fn, fns)
+ if (!access(fn->string, F_OK))
+ rewrite_credential_file(fn->string, c, NULL);
+}
+
+static void lookup_credential(const struct string_list *fns, struct credential *c)
+{
+ struct string_list_item *fn;
+
+ for_each_string_list_item(fn, fns)
+ if (parse_credential_file(fn->string, c, print_entry, NULL))
+ return; /* Found credential */
+}
+
+int cmd_credential_store(int argc, const char **argv, const char *prefix)
+{
+ const char * const usage[] = {
+ "git credential-store [<options>] <action>",
+ NULL
+ };
+ const char *op;
+ struct credential c = CREDENTIAL_INIT;
+ struct string_list fns = STRING_LIST_INIT_DUP;
+ char *file = NULL;
+ struct option options[] = {
+ OPT_STRING(0, "file", &file, "path",
+ "fetch and store credentials in <path>"),
+ OPT_END()
+ };
+
+ umask(077);
+
+ argc = parse_options(argc, (const char **)argv, prefix, options, usage, 0);
+ if (argc != 1)
+ usage_with_options(usage, options);
+ op = argv[0];
+
+ if (file) {
+ string_list_append(&fns, file);
+ } else {
+ if ((file = expand_user_path("~/.git-credentials", 0)))
+ string_list_append_nodup(&fns, file);
+ file = xdg_config_home("credentials");
+ if (file)
+ string_list_append_nodup(&fns, file);
+ }
+ if (!fns.nr)
+ die("unable to set up default path; use --file");
+
+ if (credential_read(&c, stdin) < 0)
+ die("unable to read credential");
+
+ if (!strcmp(op, "get"))
+ lookup_credential(&fns, &c);
+ else if (!strcmp(op, "erase"))
+ remove_credential(&fns, &c);
+ else if (!strcmp(op, "store"))
+ store_credential(&fns, &c);
+ else
+ ; /* Ignore unknown operation. */
+
+ string_list_clear(&fns, 0);
+ return 0;
+}