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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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_PASSWDQC
static void *passwdqc_dl = NULL;
DLSYM_FUNCTION(passwdqc_params_reset);
DLSYM_FUNCTION(passwdqc_params_load);
DLSYM_FUNCTION(passwdqc_params_parse);
DLSYM_FUNCTION(passwdqc_params_free);
DLSYM_FUNCTION(passwdqc_check);
DLSYM_FUNCTION(passwdqc_random);
int dlopen_passwdqc(void) {
ELF_NOTE_DLOPEN("passwdqc",
"Support for password quality checks",
ELF_NOTE_DLOPEN_PRIORITY_SUGGESTED,
"libpasswdqc.so.1");
return dlopen_many_sym_or_warn(
&passwdqc_dl, "libpasswdqc.so.1", LOG_DEBUG,
DLSYM_ARG(passwdqc_params_reset),
DLSYM_ARG(passwdqc_params_load),
DLSYM_ARG(passwdqc_params_parse),
DLSYM_ARG(passwdqc_params_free),
DLSYM_ARG(passwdqc_check),
DLSYM_ARG(passwdqc_random));
}
static int pwqc_allocate_context(passwdqc_params_t **ret) {
_cleanup_(sym_passwdqc_params_freep) passwdqc_params_t *params = NULL;
_cleanup_free_ char *load_reason = NULL;
int r;
assert(ret);
r = dlopen_passwdqc();
if (r < 0)
return r;
params = new0(passwdqc_params_t, 1);
if (!params)
return log_oom();
sym_passwdqc_params_reset(params);
r = sym_passwdqc_params_load(params, &load_reason, "/etc/passwdqc.conf");
if (r < 0) {
if (!load_reason)
return log_oom();
log_debug("Failed to load passwdqc configuration file, ignoring: %s", load_reason);
}
*ret = TAKE_PTR(params);
return 0;
}
int suggest_passwords(void) {
_cleanup_(sym_passwdqc_params_freep) passwdqc_params_t *params = NULL;
_cleanup_strv_free_erase_ char **suggestions = NULL;
_cleanup_(erase_and_freep) char *joined = NULL;
int r;
r = pwqc_allocate_context(¶ms);
if (r < 0) {
if (ERRNO_IS_NOT_SUPPORTED(r))
return 0;
return log_error_errno(r, "Failed to allocate libpasswdqc context: %m");
}
suggestions = new0(char*, N_SUGGESTIONS+1);
if (!suggestions)
return log_oom();
for (size_t i = 0; i < N_SUGGESTIONS; i++) {
suggestions[i] = sym_passwdqc_random(¶ms->qc);
if (!suggestions[i])
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to generate password, ignoring");
}
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_passwdqc_params_freep) passwdqc_params_t *params = NULL;
const char *check_reason;
int r;
assert(password);
r = pwqc_allocate_context(¶ms);
if (r < 0)
return log_debug_errno(r, "Failed to allocate libpasswdqc context: %m");
if (username) {
const struct passwd pw = {
.pw_name = (char *) username,
/*
* passwdqc_check() could use this information to check
* whether the password is based on the personal login information,
* but we cannot provide it.
*/
.pw_passwd = (char *) "",
.pw_gecos = (char *) "",
.pw_dir = (char *) "",
.pw_shell = (char *) ""
};
check_reason = sym_passwdqc_check(¶ms->qc, password, old, &pw);
} else
check_reason = sym_passwdqc_check(¶ms->qc, password, old, /* pw */ NULL);
if (check_reason) {
if (ret_error) {
char *e = strdup(check_reason);
if (!e)
return log_oom();
*ret_error = e;
}
return 0; /* all bad */
}
return 1; /* all good */
}
#endif
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