| /* 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) { |
| 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)); |
| } |
| |
| 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 |