141 lines
4.7 KiB
C
141 lines
4.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <unistd.h>
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#if HAVE_PWQUALITY
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/* pwquality.h uses size_t but doesn't include sys/types.h on its own */
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#include <sys/types.h>
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#include <pwquality.h>
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#endif
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#include "bus-common-errors.h"
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#include "home-util.h"
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#include "pwquality-util.h"
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#include "strv.h"
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#if HAVE_PWQUALITY
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DEFINE_TRIVIAL_CLEANUP_FUNC(pwquality_settings_t*, pwquality_free_settings);
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static void pwquality_maybe_disable_dictionary(
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pwquality_settings_t *pwq) {
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
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const char *path;
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int r;
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r = pwquality_get_str_value(pwq, PWQ_SETTING_DICT_PATH, &path);
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if (r < 0) {
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log_warning("Failed to read libpwquality dictionary path, ignoring: %s", pwquality_strerror(buf, sizeof(buf), r, NULL));
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return;
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}
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// REMOVE THIS AS SOON AS https://github.com/libpwquality/libpwquality/pull/21 IS MERGED AND RELEASED
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if (isempty(path))
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path = "/usr/share/cracklib/pw_dict.pwd.gz";
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if (isempty(path)) {
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log_warning("Weird, no dictionary file configured, ignoring.");
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return;
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}
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if (access(path, F_OK) >= 0)
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return;
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if (errno != ENOENT) {
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log_warning_errno(errno, "Failed to check if dictionary file %s exists, ignoring: %m", path);
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return;
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}
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r = pwquality_set_int_value(pwq, PWQ_SETTING_DICT_CHECK, 0);
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if (r < 0) {
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log_warning("Failed to disable libpwquality dictionary check, ignoring: %s", pwquality_strerror(buf, sizeof(buf), r, NULL));
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return;
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}
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}
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int quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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_cleanup_(pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN], **pp;
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void *auxerror;
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int r;
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assert(hr);
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assert(secret);
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pwq = pwquality_default_settings();
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if (!pwq)
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return log_oom();
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r = pwquality_read_config(pwq, NULL, &auxerror);
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if (r < 0)
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log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to read libpwquality configuation, ignoring: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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pwquality_maybe_disable_dictionary(pwq);
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/* This is a bit more complex than one might think at first. pwquality_check() would like to know the
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* old password to make security checks. We support arbitrary numbers of passwords however, hence we
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* call the function once for each combination of old and new password. */
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/* Iterate through all new passwords */
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STRV_FOREACH(pp, secret->password) {
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bool called = false;
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char **old;
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r = test_password_many(hr->hashed_password, *pp);
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if (r < 0)
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return r;
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if (r == 0) /* This is an old password as it isn't listed in the hashedPassword field, skip it */
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continue;
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/* Check this password against all old passwords */
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STRV_FOREACH(old, secret->password) {
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if (streq(*pp, *old))
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continue;
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r = test_password_many(hr->hashed_password, *old);
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if (r < 0)
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return r;
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if (r > 0) /* This is a new password, not suitable as old password */
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continue;
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r = pwquality_check(pwq, *pp, *old, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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called = true;
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}
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if (called)
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continue;
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/* If there are no old passwords, let's call pwquality_check() without any. */
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r = pwquality_check(pwq, *pp, NULL, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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}
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return 0;
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}
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#else
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int quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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assert(hr);
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assert(secret);
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return 0;
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}
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#endif
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