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-rw-r--r--credential.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/credential.c b/credential.c
new file mode 100644
index 0000000..62d1c56
--- /dev/null
+++ b/credential.c
@@ -0,0 +1,365 @@
+#include "cache.h"
+#include "credential.h"
+#include "string-list.h"
+#include "run-command.h"
+#include "url.h"
+#include "prompt.h"
+
+void credential_init(struct credential *c)
+{
+ memset(c, 0, sizeof(*c));
+ c->helpers.strdup_strings = 1;
+}
+
+void credential_clear(struct credential *c)
+{
+ free(c->protocol);
+ free(c->host);
+ free(c->path);
+ free(c->username);
+ free(c->password);
+ string_list_clear(&c->helpers, 0);
+
+ credential_init(c);
+}
+
+int credential_match(const struct credential *want,
+ const struct credential *have)
+{
+#define CHECK(x) (!want->x || (have->x && !strcmp(want->x, have->x)))
+ return CHECK(protocol) &&
+ CHECK(host) &&
+ CHECK(path) &&
+ CHECK(username);
+#undef CHECK
+}
+
+static int credential_config_callback(const char *var, const char *value,
+ void *data)
+{
+ struct credential *c = data;
+ const char *key, *dot;
+
+ key = skip_prefix(var, "credential.");
+ if (!key)
+ return 0;
+
+ if (!value)
+ return config_error_nonbool(var);
+
+ dot = strrchr(key, '.');
+ if (dot) {
+ struct credential want = CREDENTIAL_INIT;
+ char *url = xmemdupz(key, dot - key);
+ int matched;
+
+ credential_from_url(&want, url);
+ matched = credential_match(&want, c);
+
+ credential_clear(&want);
+ free(url);
+
+ if (!matched)
+ return 0;
+ key = dot + 1;
+ }
+
+ if (!strcmp(key, "helper"))
+ string_list_append(&c->helpers, value);
+ else if (!strcmp(key, "username")) {
+ if (!c->username)
+ c->username = xstrdup(value);
+ }
+ else if (!strcmp(key, "usehttppath"))
+ c->use_http_path = git_config_bool(var, value);
+
+ return 0;
+}
+
+static int proto_is_http(const char *s)
+{
+ if (!s)
+ return 0;
+ return !strcmp(s, "https") || !strcmp(s, "http");
+}
+
+static void credential_apply_config(struct credential *c)
+{
+ if (c->configured)
+ return;
+ git_config(credential_config_callback, c);
+ c->configured = 1;
+
+ if (!c->use_http_path && proto_is_http(c->protocol)) {
+ free(c->path);
+ c->path = NULL;
+ }
+}
+
+static void credential_describe(struct credential *c, struct strbuf *out)
+{
+ if (!c->protocol)
+ return;
+ strbuf_addf(out, "%s://", c->protocol);
+ if (c->username && *c->username)
+ strbuf_addf(out, "%s@", c->username);
+ if (c->host)
+ strbuf_addstr(out, c->host);
+ if (c->path)
+ strbuf_addf(out, "/%s", c->path);
+}
+
+static char *credential_ask_one(const char *what, struct credential *c,
+ int flags)
+{
+ struct strbuf desc = STRBUF_INIT;
+ struct strbuf prompt = STRBUF_INIT;
+ char *r;
+
+ credential_describe(c, &desc);
+ if (desc.len)
+ strbuf_addf(&prompt, "%s for '%s': ", what, desc.buf);
+ else
+ strbuf_addf(&prompt, "%s: ", what);
+
+ r = git_prompt(prompt.buf, flags);
+
+ strbuf_release(&desc);
+ strbuf_release(&prompt);
+ return xstrdup(r);
+}
+
+static void credential_getpass(struct credential *c)
+{
+ if (!c->username)
+ c->username = credential_ask_one("Username", c,
+ PROMPT_ASKPASS|PROMPT_ECHO);
+ if (!c->password)
+ c->password = credential_ask_one("Password", c,
+ PROMPT_ASKPASS);
+}
+
+int credential_read(struct credential *c, FILE *fp)
+{
+ struct strbuf line = STRBUF_INIT;
+
+ while (strbuf_getline(&line, fp, '\n') != EOF) {
+ char *key = line.buf;
+ char *value = strchr(key, '=');
+
+ if (!line.len)
+ break;
+
+ if (!value) {
+ warning("invalid credential line: %s", key);
+ strbuf_release(&line);
+ return -1;
+ }
+ *value++ = '\0';
+
+ if (!strcmp(key, "username")) {
+ free(c->username);
+ c->username = xstrdup(value);
+ } else if (!strcmp(key, "password")) {
+ free(c->password);
+ c->password = xstrdup(value);
+ } else if (!strcmp(key, "protocol")) {
+ free(c->protocol);
+ c->protocol = xstrdup(value);
+ } else if (!strcmp(key, "host")) {
+ free(c->host);
+ c->host = xstrdup(value);
+ } else if (!strcmp(key, "path")) {
+ free(c->path);
+ c->path = xstrdup(value);
+ }
+ /*
+ * Ignore other lines; we don't know what they mean, but
+ * this future-proofs us when later versions of git do
+ * learn new lines, and the helpers are updated to match.
+ */
+ }
+
+ strbuf_release(&line);
+ return 0;
+}
+
+static void credential_write_item(FILE *fp, const char *key, const char *value)
+{
+ if (!value)
+ return;
+ fprintf(fp, "%s=%s\n", key, value);
+}
+
+static void credential_write(const struct credential *c, FILE *fp)
+{
+ credential_write_item(fp, "protocol", c->protocol);
+ credential_write_item(fp, "host", c->host);
+ credential_write_item(fp, "path", c->path);
+ credential_write_item(fp, "username", c->username);
+ credential_write_item(fp, "password", c->password);
+}
+
+static int run_credential_helper(struct credential *c,
+ const char *cmd,
+ int want_output)
+{
+ struct child_process helper;
+ const char *argv[] = { NULL, NULL };
+ FILE *fp;
+
+ memset(&helper, 0, sizeof(helper));
+ argv[0] = cmd;
+ helper.argv = argv;
+ helper.use_shell = 1;
+ helper.in = -1;
+ if (want_output)
+ helper.out = -1;
+ else
+ helper.no_stdout = 1;
+
+ if (start_command(&helper) < 0)
+ return -1;
+
+ fp = xfdopen(helper.in, "w");
+ credential_write(c, fp);
+ fclose(fp);
+
+ if (want_output) {
+ int r;
+ fp = xfdopen(helper.out, "r");
+ r = credential_read(c, fp);
+ fclose(fp);
+ if (r < 0) {
+ finish_command(&helper);
+ return -1;
+ }
+ }
+
+ if (finish_command(&helper))
+ return -1;
+ return 0;
+}
+
+static int credential_do(struct credential *c, const char *helper,
+ const char *operation)
+{
+ struct strbuf cmd = STRBUF_INIT;
+ int r;
+
+ if (helper[0] == '!')
+ strbuf_addstr(&cmd, helper + 1);
+ else if (is_absolute_path(helper))
+ strbuf_addstr(&cmd, helper);
+ else
+ strbuf_addf(&cmd, "git credential-%s", helper);
+
+ strbuf_addf(&cmd, " %s", operation);
+ r = run_credential_helper(c, cmd.buf, !strcmp(operation, "get"));
+
+ strbuf_release(&cmd);
+ return r;
+}
+
+void credential_fill(struct credential *c)
+{
+ int i;
+
+ if (c->username && c->password)
+ return;
+
+ credential_apply_config(c);
+
+ for (i = 0; i < c->helpers.nr; i++) {
+ credential_do(c, c->helpers.items[i].string, "get");
+ if (c->username && c->password)
+ return;
+ }
+
+ credential_getpass(c);
+ if (!c->username && !c->password)
+ die("unable to get password from user");
+}
+
+void credential_approve(struct credential *c)
+{
+ int i;
+
+ if (c->approved)
+ return;
+ if (!c->username || !c->password)
+ return;
+
+ credential_apply_config(c);
+
+ for (i = 0; i < c->helpers.nr; i++)
+ credential_do(c, c->helpers.items[i].string, "store");
+ c->approved = 1;
+}
+
+void credential_reject(struct credential *c)
+{
+ int i;
+
+ credential_apply_config(c);
+
+ for (i = 0; i < c->helpers.nr; i++)
+ credential_do(c, c->helpers.items[i].string, "erase");
+
+ free(c->username);
+ c->username = NULL;
+ free(c->password);
+ c->password = NULL;
+ c->approved = 0;
+}
+
+void credential_from_url(struct credential *c, const char *url)
+{
+ const char *at, *colon, *cp, *slash, *host, *proto_end;
+
+ credential_clear(c);
+
+ /*
+ * Match one of:
+ * (1) proto://<host>/...
+ * (2) proto://<user>@<host>/...
+ * (3) proto://<user>:<pass>@<host>/...
+ */
+ proto_end = strstr(url, "://");
+ if (!proto_end)
+ return;
+ cp = proto_end + 3;
+ at = strchr(cp, '@');
+ colon = strchr(cp, ':');
+ slash = strchrnul(cp, '/');
+
+ if (!at || slash <= at) {
+ /* Case (1) */
+ host = cp;
+ }
+ else if (!colon || at <= colon) {
+ /* Case (2) */
+ c->username = url_decode_mem(cp, at - cp);
+ host = at + 1;
+ } else {
+ /* Case (3) */
+ c->username = url_decode_mem(cp, colon - cp);
+ c->password = url_decode_mem(colon + 1, at - (colon + 1));
+ host = at + 1;
+ }
+
+ if (proto_end - url > 0)
+ c->protocol = xmemdupz(url, proto_end - url);
+ if (slash - host > 0)
+ c->host = url_decode_mem(host, slash - host);
+ /* Trim leading and trailing slashes from path */
+ while (*slash == '/')
+ slash++;
+ if (*slash) {
+ char *p;
+ c->path = url_decode(slash);
+ p = c->path + strlen(c->path) - 1;
+ while (p > c->path && *p == '/')
+ *p-- = '\0';
+ }
+}