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-rw-r--r--ep_login.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/ep_login.c b/ep_login.c
new file mode 100644
index 0000000..0247ce4
--- /dev/null
+++ b/ep_login.c
@@ -0,0 +1,306 @@
+/*
+ * nanobbs, a tiny forums software.
+ * Copyright (C) 2025-2026 Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include "endpoints.h"
+#include "db.h"
+#include "defs.h"
+#include "form.h"
+#include "op.h"
+#include "utils.h"
+#include <cjson/cJSON.h>
+#include <dynstr.h>
+#include <libweb/form.h>
+#include <sodium.h>
+#include <sqlite3.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct login
+{
+ bool valid;
+ char *username, *password, *key;
+ sqlite3 *db;
+};
+
+static void free_login(void *const p)
+{
+ int error;
+ struct login *const l = p;
+
+ if (!l)
+ return;
+ else if ((error = sqlite3_close(l->db)) != SQLITE_OK)
+ fprintf(stderr, "%s: sqlite3_close: %s\n", __func__,
+ sqlite3_errstr(error));
+
+ free(l->username);
+ free(l->password);
+ free(l->key);
+ free(l);
+}
+
+static int row(sqlite3_stmt *const stmt,
+ const struct http_payload *const p, struct http_response *const r,
+ void *const user, void *const args)
+{
+ int ret = -1;
+ struct login *const l = args;
+ sqlite3 *const db = l->db;
+ const size_t len = strlen(l->password);
+ char *const hashpwd = db_str(db, stmt, "password"),
+ *key = db_str(db, stmt, "signkey");
+
+ if (!hashpwd)
+ {
+ fprintf(stderr, "%s: missing password\n", __func__);
+ goto end;
+ }
+ else if (!key)
+ {
+ fprintf(stderr, "%s: missing signkey\n", __func__);
+ goto end;
+ }
+ else if (!crypto_pwhash_str_verify(hashpwd, l->password, len))
+ {
+ l->valid = true;
+ l->key = key;
+ key = NULL;
+ }
+
+ ret = 0;
+
+end:
+ free(key);
+ free(hashpwd);
+ return ret;
+}
+
+static int authorize(const struct login *const l, struct http_response *const r)
+{
+ int ret = -1;
+ char *const cookie = gencookie(l->username, l->key);
+
+ if (!cookie)
+ {
+ fprintf(stderr, "%s: gencookie failed\n", __func__);
+ goto end;
+ }
+
+ *r = (const struct http_response){.status = HTTP_STATUS_SEE_OTHER};
+
+ if (http_response_add_header(r, "Location", "/")
+ || http_response_add_header(r, "Set-Cookie", cookie))
+ {
+ fprintf(stderr, "%s: http_response_add_header failed\n", __func__);
+ goto end;
+ }
+
+ ret = 0;
+
+end:
+ free(cookie);
+ return ret;
+}
+
+static int end(const struct http_payload *const pl,
+ struct http_response *const r, void *const user, void *const args)
+{
+ struct login *const l = args;
+ const int error = sqlite3_close(l->db);
+
+ l->db = NULL;
+
+ if (error != SQLITE_OK)
+ {
+ fprintf(stderr, "%s: sqlite3_close: %s\n", __func__,
+ sqlite3_errstr(error));
+ return -1;
+ }
+ else if (l->valid)
+ {
+ if (authorize(l, r))
+ {
+ fprintf(stderr, "%s: authorize failed\n", __func__);
+ return -1;
+ }
+ }
+ else if (form_unauthorized("Invalid username or password", r))
+ {
+ fprintf(stderr, "%s: form_unauthorized failed\n", __func__);
+ return -1;
+ }
+
+ free_login(l);
+ return 0;
+}
+
+static int query_creds(const struct http_payload *const p,
+ struct http_response *const r, void *const user, void *const args)
+{
+ int ret = -1;
+ struct login *const l = args;
+ struct dynstr d;
+
+ dynstr_init(&d);
+
+ if (dynstr_append(&d,
+ "SELECT signkey, password FROM users WHERE name = '%s'", l->username))
+ {
+ fprintf(stderr, "%s: dynstr_append failed\n", __func__);
+ goto end;
+ }
+
+ const struct op_cfg op =
+ {
+ .error = free_login,
+ .end = end,
+ .row = row,
+ .args = l
+ };
+
+ if (!op_run(l->db, d.str, &op, r))
+ {
+ fprintf(stderr, "%s: op_run failed\n", __func__);
+ goto end;
+ }
+
+ ret = 0;
+
+end:
+
+ if (ret)
+ free_login(l);
+
+ dynstr_free(&d);
+ return ret;
+}
+
+static int open_db(const struct http_payload *const p,
+ struct http_response *const r, void *const user, void *const args)
+{
+ const struct cfg *const cfg = user;
+ struct login *const l = args;
+ const int error = db_open(cfg->dir, &l->db);
+
+ if (error != SQLITE_OK)
+ {
+ if (error != SQLITE_BUSY)
+ {
+ fprintf(stderr, "%s: db_open: %s\n", __func__,
+ sqlite3_errstr(error));
+ goto failure;
+ }
+ }
+ else
+ *r = (const struct http_response)
+ {
+ .step.payload = query_creds,
+ .args = l
+ };
+
+ return 0;
+
+failure:
+ free(l);
+ return -1;
+}
+
+static int check_user(const char *const username)
+{
+ return strspn(username, USER_SYMS) != strlen(username);
+}
+
+int ep_login(const struct http_payload *const p, struct http_response *const r,
+ void *const user)
+{
+ int error, ret = -1;
+ char *userdup = NULL, *passdup = NULL;
+ struct form *f = NULL;
+ struct login *l = NULL;
+ const char *username, *password;
+
+ if ((error = form_alloc(p->u.post.data, &f)))
+ {
+ if ((ret = error) < 0)
+ fprintf(stderr, "%s: form_alloc failed\n", __func__);
+ else
+ ret = form_badreq("Invalid request", r);
+
+ goto end;
+ }
+ else if (!(username = form_value(f, "username")))
+ {
+ fprintf(stderr, "%s: missing username\n", __func__);
+ ret = form_badreq("Missing username", r);
+ goto end;
+ }
+ else if (!(password = form_value(f, "password")))
+ {
+ fprintf(stderr, "%s: missing password\n", __func__);
+ ret = form_badreq("Missing password", r);
+ goto end;
+ }
+ else if (check_user(username))
+ {
+ fprintf(stderr, "%s: check_user failed\n", __func__);
+ ret = form_unauthorized("Invalid username", r);
+ goto end;
+ }
+ else if (!(userdup = strdup(username))
+ || !(passdup = strdup(password)))
+ {
+ fprintf(stderr, "%s: strdup(3): %s\n", __func__, strerror(errno));
+ goto end;
+ }
+ else if (!(l = malloc(sizeof *l)))
+ {
+ fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
+ goto end;
+ }
+
+ *l = (const struct login)
+ {
+ .username = userdup,
+ .password = passdup,
+ };
+
+ *r = (const struct http_response)
+ {
+ .step.payload = open_db,
+ .args = l
+ };
+
+ ret = 0;
+
+end:
+
+ if (ret)
+ {
+ free(userdup);
+ free(passdup);
+ free(l);
+ }
+
+ form_free(f);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2026-03-14 17:46:09 +0000