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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 "password-quality-util.h"
#include "strv.h"
#if HAVE_PWQUALITY
static void *pwquality_dl = NULL;
DLSYM_PROTOTYPE(pwquality_check) = NULL;
DLSYM_PROTOTYPE(pwquality_default_settings) = NULL;
DLSYM_PROTOTYPE(pwquality_free_settings) = NULL;
DLSYM_PROTOTYPE(pwquality_generate) = NULL;
DLSYM_PROTOTYPE(pwquality_get_str_value) = NULL;
DLSYM_PROTOTYPE(pwquality_read_config) = NULL;
DLSYM_PROTOTYPE(pwquality_set_int_value) = NULL;
DLSYM_PROTOTYPE(pwquality_strerror) = NULL;
int dlopen_pwquality(void) {
ELF_NOTE_DLOPEN("pwquality",
"Support for password quality checks",
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
"libpwquality.so.1");
return dlopen_many_sym_or_warn(
&pwquality_dl, "libpwquality.so.1", 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));
}
static 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;
}
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));
}
static 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;
}
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];
int r;
r = pwq_allocate_context(&pwq);
if (r < 0) {
if (ERRNO_IS_NOT_SUPPORTED(r))
return 0;
return log_error_errno(r, "Failed to allocate libpwquality context: %m");
}
suggestions = new0(char*, N_SUGGESTIONS+1);
if (!suggestions)
return log_oom();
for (size_t 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();
printf("Password suggestions: %s\n", joined);
return 1;
}
int check_password_quality(const char *password, const char *old, 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 (r < 0)
return log_debug_errno(r, "Failed to allocate libpwquality context: %m");
r = sym_pwquality_check(pwq, password, old, username, &auxerror);
if (r < 0) {
if (ret_error) {
r = strdup_to(ret_error,
sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
if (r < 0)
return r;
}
return 0; /* all bad */
}
return 1; /* all good */
}
#endif
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