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-rw-r--r--src/home/user-record-pwquality.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/home/user-record-pwquality.c b/src/home/user-record-pwquality.c
new file mode 100644
index 0000000..609e620
--- /dev/null
+++ b/src/home/user-record-pwquality.c
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bus-common-errors.h"
+#include "errno-util.h"
+#include "home-util.h"
+#include "libcrypt-util.h"
+#include "pwquality-util.h"
+#include "strv.h"
+#include "user-record-pwquality.h"
+#include "user-record-util.h"
+
+#if HAVE_PWQUALITY
+
+int user_record_quality_check_password(
+ UserRecord *hr,
+ UserRecord *secret,
+ sd_bus_error *error) {
+
+ _cleanup_(sym_pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
+ char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
+ void *auxerror;
+ int r;
+
+ assert(hr);
+ assert(secret);
+
+ r = pwq_allocate_context(&pwq);
+ if (ERRNO_IS_NOT_SUPPORTED(r))
+ return 0;
+ if (r < 0)
+ return log_debug_errno(r, "Failed to allocate libpwquality context: %m");
+
+ /* This is a bit more complex than one might think at first. pwquality_check() would like to know the
+ * old password to make security checks. We support arbitrary numbers of passwords however, hence we
+ * call the function once for each combination of old and new password. */
+
+ /* Iterate through all new passwords */
+ STRV_FOREACH(pp, secret->password) {
+ bool called = false;
+
+ r = test_password_many(hr->hashed_password, *pp);
+ if (r < 0)
+ return r;
+ if (r == 0) /* This is an old password as it isn't listed in the hashedPassword field, skip it */
+ continue;
+
+ /* Check this password against all old passwords */
+ STRV_FOREACH(old, secret->password) {
+
+ if (streq(*pp, *old))
+ continue;
+
+ r = test_password_many(hr->hashed_password, *old);
+ if (r < 0)
+ return r;
+ if (r > 0) /* This is a new password, not suitable as old password */
+ continue;
+
+ r = sym_pwquality_check(pwq, *pp, *old, hr->user_name, &auxerror);
+ if (r < 0)
+ return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
+ sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
+
+ called = true;
+ }
+
+ if (called)
+ continue;
+
+ /* If there are no old passwords, let's call pwquality_check() without any. */
+ r = sym_pwquality_check(pwq, *pp, NULL, hr->user_name, &auxerror);
+ if (r < 0)
+ return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
+ sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
+ }
+
+ return 1;
+}
+
+#else
+
+int user_record_quality_check_password(
+ UserRecord *hr,
+ UserRecord *secret,
+ sd_bus_error *error) {
+
+ return 0;
+}
+
+#endif