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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <unistd.h>
#include "dlfcn-util.h"
#include "errno-util.h"
#include "log.h"
#include "macro.h"
#include "memory-util.h"
#include "pwquality-util.h"
#include "strv.h"
#if HAVE_PWQUALITY
static void *pwquality_dl = NULL;
int (*sym_pwquality_check)(pwquality_settings_t *pwq, const char *password, const char *oldpassword, const char *user, void **auxerror);
pwquality_settings_t *(*sym_pwquality_default_settings)(void);
void (*sym_pwquality_free_settings)(pwquality_settings_t *pwq);
int (*sym_pwquality_generate)(pwquality_settings_t *pwq, int entropy_bits, char **password);
int (*sym_pwquality_get_str_value)(pwquality_settings_t *pwq, int setting, const char **value);
int (*sym_pwquality_read_config)(pwquality_settings_t *pwq, const char *cfgfile, void **auxerror);
int (*sym_pwquality_set_int_value)(pwquality_settings_t *pwq, int setting, int value);
const char* (*sym_pwquality_strerror)(char *buf, size_t len, int errcode, void *auxerror);
int dlopen_pwquality(void) {
_cleanup_(dlclosep) void *dl = NULL;
int r;
if (pwquality_dl)
return 0; /* Already loaded */
dl = dlopen("libpwquality.so.1", RTLD_LAZY);
if (!dl)
return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"libpwquality support is not installed: %s", dlerror());
r = dlsym_many_and_warn(
dl,
LOG_DEBUG,
DLSYM_ARG(pwquality_check),
DLSYM_ARG(pwquality_default_settings),
DLSYM_ARG(pwquality_free_settings),
DLSYM_ARG(pwquality_generate),
DLSYM_ARG(pwquality_get_str_value),
DLSYM_ARG(pwquality_read_config),
DLSYM_ARG(pwquality_set_int_value),
DLSYM_ARG(pwquality_strerror),
NULL);
if (r < 0)
return r;
/* Note that we never release the reference here, because there's no real reason to, after all this
* was traditionally a regular shared library dependency which lives forever too. */
pwquality_dl = TAKE_PTR(dl);
return 1;
}
void pwq_maybe_disable_dictionary(pwquality_settings_t *pwq) {
char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
const char *path;
int r;
assert(pwq);
r = sym_pwquality_get_str_value(pwq, PWQ_SETTING_DICT_PATH, &path);
if (r < 0) {
log_debug("Failed to read libpwquality dictionary path, ignoring: %s",
sym_pwquality_strerror(buf, sizeof(buf), r, NULL));
return;
}
// REMOVE THIS AS SOON AS https://github.com/libpwquality/libpwquality/pull/21 IS MERGED AND RELEASED
if (isempty(path))
path = "/usr/share/cracklib/pw_dict.pwd.gz";
if (isempty(path)) {
log_debug("Weird, no dictionary file configured, ignoring.");
return;
}
if (access(path, F_OK) >= 0)
return;
if (errno != ENOENT) {
log_debug_errno(errno, "Failed to check if dictionary file %s exists, ignoring: %m", path);
return;
}
r = sym_pwquality_set_int_value(pwq, PWQ_SETTING_DICT_CHECK, 0);
if (r < 0)
log_debug("Failed to disable libpwquality dictionary check, ignoring: %s",
sym_pwquality_strerror(buf, sizeof(buf), r, NULL));
}
int pwq_allocate_context(pwquality_settings_t **ret) {
_cleanup_(sym_pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
void *auxerror;
int r;
assert(ret);
r = dlopen_pwquality();
if (r < 0)
return r;
pwq = sym_pwquality_default_settings();
if (!pwq)
return -ENOMEM;
r = sym_pwquality_read_config(pwq, NULL, &auxerror);
if (r < 0)
log_debug("Failed to read libpwquality configuration, ignoring: %s",
sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
pwq_maybe_disable_dictionary(pwq);
*ret = TAKE_PTR(pwq);
return 0;
}
#define N_SUGGESTIONS 6
int suggest_passwords(void) {
_cleanup_(sym_pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
_cleanup_strv_free_erase_ char **suggestions = NULL;
_cleanup_(erase_and_freep) char *joined = NULL;
char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
size_t i;
int r;
r = pwq_allocate_context(&pwq);
if (ERRNO_IS_NOT_SUPPORTED(r))
return 0;
if (r < 0)
return log_error_errno(r, "Failed to allocate libpwquality context: %m");
suggestions = new0(char*, N_SUGGESTIONS+1);
if (!suggestions)
return log_oom();
for (i = 0; i < N_SUGGESTIONS; i++) {
r = sym_pwquality_generate(pwq, 64, suggestions + i);
if (r < 0)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to generate password, ignoring: %s",
sym_pwquality_strerror(buf, sizeof(buf), r, NULL));
}
joined = strv_join(suggestions, " ");
if (!joined)
return log_oom();
log_info("Password suggestions: %s", joined);
return 1;
}
int quality_check_password(const char *password, const char *username, char **ret_error) {
_cleanup_(sym_pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
void *auxerror;
int r;
assert(password);
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");
r = sym_pwquality_check(pwq, password, NULL, username, &auxerror);
if (r < 0) {
if (ret_error) {
_cleanup_free_ char *e = NULL;
e = strdup(sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
if (!e)
return -ENOMEM;
*ret_error = TAKE_PTR(e);
}
return 0; /* all bad */
}
return 1; /* all good */
}
#endif
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