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-rw-r--r--contrib/credential/libsecret/git-credential-libsecret.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/contrib/credential/libsecret/git-credential-libsecret.c b/contrib/credential/libsecret/git-credential-libsecret.c
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+++ b/contrib/credential/libsecret/git-credential-libsecret.c
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+/*
+ * Copyright (C) 2011 John Szakmeister <john@szakmeister.net>
+ * 2012 Philipp A. Hartmann <pah@qo.cx>
+ * 2016 Mantas Mikulėnas <grawity@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Credits:
+ * - GNOME Keyring API handling originally written by John Szakmeister
+ * - ported to credential helper API by Philipp A. Hartmann
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <libsecret/secret.h>
+
+/*
+ * This credential struct and API is simplified from git's credential.{h,c}
+ */
+struct credential {
+ char *protocol;
+ char *host;
+ unsigned short port;
+ char *path;
+ char *username;
+ char *password;
+ char *password_expiry_utc;
+ char *oauth_refresh_token;
+};
+
+#define CREDENTIAL_INIT { 0 }
+
+typedef int (*credential_op_cb)(struct credential *);
+
+struct credential_operation {
+ char *name;
+ credential_op_cb op;
+};
+
+#define CREDENTIAL_OP_END { NULL, NULL }
+
+static void credential_clear(struct credential *c);
+
+/* ----------------- Secret Service functions ----------------- */
+
+static const SecretSchema schema = {
+ "org.git.Password",
+ /* Ignore schema name during search for backwards compatibility */
+ SECRET_SCHEMA_DONT_MATCH_NAME,
+ {
+ /*
+ * libsecret assumes attribute values are non-confidential and
+ * unchanging, so we can't include oauth_refresh_token or
+ * password_expiry_utc.
+ */
+ { "user", SECRET_SCHEMA_ATTRIBUTE_STRING },
+ { "object", SECRET_SCHEMA_ATTRIBUTE_STRING },
+ { "protocol", SECRET_SCHEMA_ATTRIBUTE_STRING },
+ { "port", SECRET_SCHEMA_ATTRIBUTE_INTEGER },
+ { "server", SECRET_SCHEMA_ATTRIBUTE_STRING },
+ { NULL, 0 },
+ }
+};
+
+static char *make_label(struct credential *c)
+{
+ if (c->port)
+ return g_strdup_printf("Git: %s://%s:%hu/%s",
+ c->protocol, c->host, c->port, c->path ? c->path : "");
+ else
+ return g_strdup_printf("Git: %s://%s/%s",
+ c->protocol, c->host, c->path ? c->path : "");
+}
+
+static GHashTable *make_attr_list(struct credential *c)
+{
+ GHashTable *al = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);
+
+ if (c->username)
+ g_hash_table_insert(al, "user", g_strdup(c->username));
+ if (c->protocol)
+ g_hash_table_insert(al, "protocol", g_strdup(c->protocol));
+ if (c->host)
+ g_hash_table_insert(al, "server", g_strdup(c->host));
+ if (c->port)
+ g_hash_table_insert(al, "port", g_strdup_printf("%hu", c->port));
+ if (c->path)
+ g_hash_table_insert(al, "object", g_strdup(c->path));
+
+ return al;
+}
+
+static int keyring_get(struct credential *c)
+{
+ SecretService *service = NULL;
+ GHashTable *attributes = NULL;
+ GError *error = NULL;
+ GList *items = NULL;
+
+ if (!c->protocol || !(c->host || c->path))
+ return EXIT_FAILURE;
+
+ service = secret_service_get_sync(0, NULL, &error);
+ if (error != NULL) {
+ g_critical("could not connect to Secret Service: %s", error->message);
+ g_error_free(error);
+ return EXIT_FAILURE;
+ }
+
+ attributes = make_attr_list(c);
+ items = secret_service_search_sync(service,
+ &schema,
+ attributes,
+ SECRET_SEARCH_LOAD_SECRETS | SECRET_SEARCH_UNLOCK,
+ NULL,
+ &error);
+ g_hash_table_unref(attributes);
+ if (error != NULL) {
+ g_critical("lookup failed: %s", error->message);
+ g_error_free(error);
+ return EXIT_FAILURE;
+ }
+
+ if (items != NULL) {
+ SecretItem *item;
+ SecretValue *secret;
+ const char *s;
+ gchar **parts;
+
+ item = items->data;
+ secret = secret_item_get_secret(item);
+ attributes = secret_item_get_attributes(item);
+
+ s = g_hash_table_lookup(attributes, "user");
+ if (s) {
+ g_free(c->username);
+ c->username = g_strdup(s);
+ }
+
+ s = secret_value_get_text(secret);
+ if (s) {
+ /*
+ * Passwords and other attributes encoded in following format:
+ * hunter2
+ * password_expiry_utc=1684189401
+ * oauth_refresh_token=xyzzy
+ */
+ parts = g_strsplit(s, "\n", 0);
+ if (g_strv_length(parts) >= 1) {
+ g_free(c->password);
+ c->password = g_strdup(parts[0]);
+ }
+ for (int i = 1; i < g_strv_length(parts); i++) {
+ if (g_str_has_prefix(parts[i], "password_expiry_utc=")) {
+ g_free(c->password_expiry_utc);
+ c->password_expiry_utc = g_strdup(&parts[i][20]);
+ } else if (g_str_has_prefix(parts[i], "oauth_refresh_token=")) {
+ g_free(c->oauth_refresh_token);
+ c->oauth_refresh_token = g_strdup(&parts[i][20]);
+ }
+ }
+ g_strfreev(parts);
+ }
+
+ g_hash_table_unref(attributes);
+ secret_value_unref(secret);
+ g_list_free_full(items, g_object_unref);
+ }
+
+ return EXIT_SUCCESS;
+}
+
+
+static int keyring_store(struct credential *c)
+{
+ char *label = NULL;
+ GHashTable *attributes = NULL;
+ GError *error = NULL;
+ GString *secret = NULL;
+
+ /*
+ * 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 EXIT_FAILURE;
+
+ label = make_label(c);
+ attributes = make_attr_list(c);
+ secret = g_string_new(c->password);
+ if (c->password_expiry_utc) {
+ g_string_append_printf(secret, "\npassword_expiry_utc=%s",
+ c->password_expiry_utc);
+ }
+ if (c->oauth_refresh_token) {
+ g_string_append_printf(secret, "\noauth_refresh_token=%s",
+ c->oauth_refresh_token);
+ }
+ secret_password_storev_sync(&schema,
+ attributes,
+ NULL,
+ label,
+ secret->str,
+ NULL,
+ &error);
+ g_string_free(secret, TRUE);
+ g_free(label);
+ g_hash_table_unref(attributes);
+
+ if (error != NULL) {
+ g_critical("store failed: %s", error->message);
+ g_error_free(error);
+ return EXIT_FAILURE;
+ }
+
+ return EXIT_SUCCESS;
+}
+
+static int keyring_erase(struct credential *c)
+{
+ GHashTable *attributes = NULL;
+ GError *error = NULL;
+ struct credential existing = CREDENTIAL_INIT;
+
+ /*
+ * 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 EXIT_FAILURE;
+
+ if (c->password) {
+ existing.host = g_strdup(c->host);
+ existing.path = g_strdup(c->path);
+ existing.port = c->port;
+ existing.protocol = g_strdup(c->protocol);
+ existing.username = g_strdup(c->username);
+ keyring_get(&existing);
+ if (existing.password && strcmp(c->password, existing.password)) {
+ credential_clear(&existing);
+ return EXIT_SUCCESS;
+ }
+ credential_clear(&existing);
+ }
+
+ attributes = make_attr_list(c);
+ secret_password_clearv_sync(&schema,
+ attributes,
+ NULL,
+ &error);
+ g_hash_table_unref(attributes);
+
+ if (error != NULL) {
+ g_critical("erase failed: %s", error->message);
+ g_error_free(error);
+ return EXIT_FAILURE;
+ }
+
+ return EXIT_SUCCESS;
+}
+
+/*
+ * Table with helper operation callbacks, used by generic
+ * credential helper main function.
+ */
+static struct credential_operation const credential_helper_ops[] = {
+ { "get", keyring_get },
+ { "store", keyring_store },
+ { "erase", keyring_erase },
+ CREDENTIAL_OP_END
+};
+
+/* ------------------ credential functions ------------------ */
+
+static void credential_init(struct credential *c)
+{
+ memset(c, 0, sizeof(*c));
+}
+
+static void credential_clear(struct credential *c)
+{
+ g_free(c->protocol);
+ g_free(c->host);
+ g_free(c->path);
+ g_free(c->username);
+ g_free(c->password);
+ g_free(c->password_expiry_utc);
+ g_free(c->oauth_refresh_token);
+
+ credential_init(c);
+}
+
+static int credential_read(struct credential *c)
+{
+ char *buf = NULL;
+ size_t alloc;
+ ssize_t line_len;
+ char *key;
+ char *value;
+
+ while ((line_len = getline(&buf, &alloc, stdin)) > 0) {
+ key = buf;
+
+ if (buf[line_len-1] == '\n')
+ buf[--line_len] = '\0';
+
+ if (!line_len)
+ break;
+
+ value = strchr(buf, '=');
+ if (!value) {
+ g_warning("invalid credential line: %s", key);
+ g_free(buf);
+ return -1;
+ }
+ *value++ = '\0';
+
+ if (!strcmp(key, "protocol")) {
+ g_free(c->protocol);
+ c->protocol = g_strdup(value);
+ } else if (!strcmp(key, "host")) {
+ g_free(c->host);
+ c->host = g_strdup(value);
+ value = strrchr(c->host, ':');
+ if (value) {
+ *value++ = '\0';
+ c->port = atoi(value);
+ }
+ } else if (!strcmp(key, "path")) {
+ g_free(c->path);
+ c->path = g_strdup(value);
+ } else if (!strcmp(key, "username")) {
+ g_free(c->username);
+ c->username = g_strdup(value);
+ } else if (!strcmp(key, "password_expiry_utc")) {
+ g_free(c->password_expiry_utc);
+ c->password_expiry_utc = g_strdup(value);
+ } else if (!strcmp(key, "password")) {
+ g_free(c->password);
+ c->password = g_strdup(value);
+ while (*value)
+ *value++ = '\0';
+ } else if (!strcmp(key, "oauth_refresh_token")) {
+ g_free(c->oauth_refresh_token);
+ c->oauth_refresh_token = g_strdup(value);
+ while (*value)
+ *value++ = '\0';
+ }
+ /*
+ * 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.
+ */
+ }
+
+ free(buf);
+
+ 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)
+{
+ /* only write username/password, if set */
+ credential_write_item(stdout, "username", c->username);
+ credential_write_item(stdout, "password", c->password);
+ credential_write_item(stdout, "password_expiry_utc",
+ c->password_expiry_utc);
+ credential_write_item(stdout, "oauth_refresh_token",
+ c->oauth_refresh_token);
+}
+
+static void usage(const char *name)
+{
+ struct credential_operation const *try_op = credential_helper_ops;
+ const char *basename = strrchr(name, '/');
+
+ basename = (basename) ? basename + 1 : name;
+ fprintf(stderr, "usage: %s <", basename);
+ while (try_op->name) {
+ fprintf(stderr, "%s", (try_op++)->name);
+ if (try_op->name)
+ fprintf(stderr, "%s", "|");
+ }
+ fprintf(stderr, "%s", ">\n");
+}
+
+int main(int argc, char *argv[])
+{
+ int ret = EXIT_SUCCESS;
+
+ struct credential_operation const *try_op = credential_helper_ops;
+ struct credential cred = CREDENTIAL_INIT;
+
+ if (!argv[1]) {
+ usage(argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ g_set_application_name("Git Credential Helper");
+
+ /* lookup operation callback */
+ while (try_op->name && strcmp(argv[1], try_op->name))
+ try_op++;
+
+ /* unsupported operation given -- ignore silently */
+ if (!try_op->name || !try_op->op)
+ goto out;
+
+ ret = credential_read(&cred);
+ if (ret)
+ goto out;
+
+ /* perform credential operation */
+ ret = (*try_op->op)(&cred);
+
+ credential_write(&cred);
+
+out:
+ credential_clear(&cred);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 22:47:13 +0000