diff options
Diffstat (limited to 'src/shared/pwquality-util.c')
| -rw-r--r-- | src/shared/pwquality-util.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/shared/pwquality-util.c b/src/shared/pwquality-util.c new file mode 100644 index 0000000..b683595 --- /dev/null +++ b/src/shared/pwquality-util.c @@ -0,0 +1,170 @@ +/* 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 (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 (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 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 (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 |