1 files changed, 127 insertions, 0 deletions
diff --git a/src/auth/passdb-passwd.c b/src/auth/passdb-passwd.c
new file mode 100644
index 0000000..89c54eb
--- /dev/null
+++ b/src/auth/passdb-passwd.c
@@ -0,0 +1,127 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "auth-common.h"
+#include "passdb.h"
+
+#ifdef PASSDB_PASSWD
+
+#include "safe-memset.h"
+#include "ipwd.h"
+
+#define PASSWD_CACHE_KEY "%u"
+#define PASSWD_PASS_SCHEME "CRYPT"
+
+static enum passdb_result
+passwd_lookup(struct auth_request *request, struct passwd *pw_r)
+{
+	e_debug(authdb_event(request), "lookup");
+
+	switch (i_getpwnam(request->fields.user, pw_r)) {
+	case -1:
+		e_error(authdb_event(request),
+			"getpwnam() failed: %m");
+		return PASSDB_RESULT_INTERNAL_FAILURE;
+	case 0:
+		auth_request_log_unknown_user(request, AUTH_SUBSYS_DB);
+		return PASSDB_RESULT_USER_UNKNOWN;
+	}
+
+	if (!IS_VALID_PASSWD(pw_r->pw_passwd)) {
+		e_info(authdb_event(request),
+		       "invalid password field '%s'", pw_r->pw_passwd);
+		return PASSDB_RESULT_USER_DISABLED;
+	}
+
+	/* save the password so cache can use it */
+	auth_request_set_field(request, "password", pw_r->pw_passwd,
+			       PASSWD_PASS_SCHEME);
+	return PASSDB_RESULT_OK;
+}
+
+static void
+passwd_verify_plain(struct auth_request *request, const char *password,
+		    verify_plain_callback_t *callback)
+{
+	struct passwd pw;
+	enum passdb_result res;
+
+	res = passwd_lookup(request, &pw);
+	if (res != PASSDB_RESULT_OK) {
+		callback(res, request);
+		return;
+	}
+	/* check if the password is valid */
+	res = auth_request_password_verify(request, password, pw.pw_passwd,
+					   PASSWD_PASS_SCHEME, AUTH_SUBSYS_DB);
+
+	/* clear the passwords from memory */
+	safe_memset(pw.pw_passwd, 0, strlen(pw.pw_passwd));
+
+	if (res != PASSDB_RESULT_OK) {
+		callback(res, request);
+		return;
+	}
+
+	/* make sure we're using the username exactly as it's in the database */
+        auth_request_set_field(request, "user", pw.pw_name, NULL);
+
+	callback(res, request);
+}
+
+static void
+passwd_lookup_credentials(struct auth_request *request,
+			  lookup_credentials_callback_t *callback)
+{
+	struct passwd pw;
+	enum passdb_result res;
+
+	res = passwd_lookup(request, &pw);
+	if (res != PASSDB_RESULT_OK) {
+		callback(res, NULL, 0, request);
+		return;
+	}
+	/* make sure we're using the username exactly as it's in the database */
+        auth_request_set_field(request, "user", pw.pw_name, NULL);
+	passdb_handle_credentials(PASSDB_RESULT_OK, pw.pw_passwd,
+				  PASSWD_PASS_SCHEME, callback, request);
+}
+
+static struct passdb_module *
+passwd_preinit(pool_t pool, const char *args)
+{
+	struct passdb_module *module;
+
+	module = p_new(pool, struct passdb_module, 1);
+	module->blocking = TRUE;
+	if (strcmp(args, "blocking=no") == 0)
+		module->blocking = FALSE;
+	else if (*args != '\0')
+		i_fatal("passdb passwd: Unknown setting: %s", args);
+
+	module->default_cache_key = PASSWD_CACHE_KEY;
+	module->default_pass_scheme = PASSWD_PASS_SCHEME;
+	return module;
+}
+
+static void passwd_deinit(struct passdb_module *module ATTR_UNUSED)
+{
+	endpwent();
+}
+
+struct passdb_module_interface passdb_passwd = {
+	"passwd",
+
+	passwd_preinit,
+	NULL,
+	passwd_deinit,
+
+	passwd_verify_plain,
+	passwd_lookup_credentials,
+	NULL
+};
+
+#else
+struct passdb_module_interface passdb_passwd = {
+	.name = "passwd"
+};
+#endif