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home: make libpwquality dep a runtime dlopen() one
Also, let's move the glue for this to src/shared/ so that we later can reuse this in sysemd-firstboot. Given that libpwquality is a more a leaf dependency, let's make it runtime optional, so that downstream distros can downgrade their package deps from Required to Recommended.
This commit is contained in:
parent
9c23ce7363
commit
679badd7ba
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@ -2173,8 +2173,7 @@ if conf.get('ENABLE_HOMED') == 1
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link_with : [libshared],
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dependencies : [threads,
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libcrypt,
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libopenssl,
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libpwquality],
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libopenssl],
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install_rpath : rootlibexecdir,
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install : true,
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install_dir : rootlibexecdir)
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@ -2188,8 +2187,7 @@ if conf.get('ENABLE_HOMED') == 1
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libcrypt,
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libopenssl,
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libp11kit,
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libfido2,
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libpwquality],
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libfido2],
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install_rpath : rootlibexecdir,
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install : true,
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install_dir : rootbindir)
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@ -30,6 +30,7 @@
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#include "rlimit-util.h"
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#include "spawn-polkit-agent.h"
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#include "terminal-util.h"
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#include "user-record-pwquality.h"
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#include "user-record-show.h"
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#include "user-record-util.h"
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#include "user-record.h"
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@ -1097,7 +1098,7 @@ static int create_home(int argc, char *argv[], void *userdata) {
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/* If password quality enforcement is disabled, let's at least warn client side */
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r = quality_check_password(hr, hr, &error);
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r = user_record_quality_check_password(hr, hr, &error);
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if (r < 0)
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log_warning_errno(r, "Specified password does not pass quality checks (%s), proceeding anyway.", bus_error_message(&error, r));
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}
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@ -33,6 +33,7 @@
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#include "strv.h"
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#include "user-record-sign.h"
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#include "user-record-util.h"
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#include "user-record-pwquality.h"
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#include "user-record.h"
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#include "user-util.h"
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@ -1289,7 +1290,7 @@ int home_create(Home *h, UserRecord *secret, sd_bus_error *error) {
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if (h->record->enforce_password_policy == false)
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log_debug("Password quality check turned off for account, skipping.");
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else {
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r = quality_check_password(h->record, secret, error);
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r = user_record_quality_check_password(h->record, secret, error);
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if (r < 0)
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return r;
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}
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@ -1640,7 +1641,7 @@ int home_passwd(Home *h,
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if (c->enforce_password_policy == false)
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log_debug("Password quality check turned off for account, skipping.");
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else {
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r = quality_check_password(c, merged_secret, error);
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r = user_record_quality_check_password(c, merged_secret, error);
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if (r < 0)
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return r;
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}
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@ -50,8 +50,8 @@ systemd_homed_sources = files('''
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homed-varlink.c
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homed-varlink.h
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homed.c
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pwquality-util.c
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pwquality-util.h
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user-record-pwquality.c
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user-record-pwquality.h
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user-record-sign.c
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user-record-sign.h
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user-record-util.c
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@ -74,8 +74,8 @@ homectl_sources = files('''
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homectl-pkcs11.c
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homectl-pkcs11.h
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homectl.c
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pwquality-util.c
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pwquality-util.h
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user-record-pwquality.c
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user-record-pwquality.h
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user-record-util.c
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user-record-util.h
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'''.split())
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@ -1,186 +0,0 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <unistd.h>
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#if HAVE_PWQUALITY
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/* pwquality.h uses size_t but doesn't include sys/types.h on its own */
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#include <sys/types.h>
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#include <pwquality.h>
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#endif
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#include "bus-common-errors.h"
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#include "home-util.h"
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#include "memory-util.h"
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#include "pwquality-util.h"
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#include "strv.h"
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#if HAVE_PWQUALITY
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DEFINE_TRIVIAL_CLEANUP_FUNC(pwquality_settings_t*, pwquality_free_settings);
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static void pwquality_maybe_disable_dictionary(
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pwquality_settings_t *pwq) {
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
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const char *path;
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int r;
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r = pwquality_get_str_value(pwq, PWQ_SETTING_DICT_PATH, &path);
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if (r < 0) {
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log_warning("Failed to read libpwquality dictionary path, ignoring: %s", pwquality_strerror(buf, sizeof(buf), r, NULL));
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return;
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}
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// REMOVE THIS AS SOON AS https://github.com/libpwquality/libpwquality/pull/21 IS MERGED AND RELEASED
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if (isempty(path))
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path = "/usr/share/cracklib/pw_dict.pwd.gz";
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if (isempty(path)) {
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log_warning("Weird, no dictionary file configured, ignoring.");
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return;
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}
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if (access(path, F_OK) >= 0)
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return;
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if (errno != ENOENT) {
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log_warning_errno(errno, "Failed to check if dictionary file %s exists, ignoring: %m", path);
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return;
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}
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r = pwquality_set_int_value(pwq, PWQ_SETTING_DICT_CHECK, 0);
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if (r < 0) {
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log_warning("Failed to disable libpwquality dictionary check, ignoring: %s", pwquality_strerror(buf, sizeof(buf), r, NULL));
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return;
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}
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}
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int quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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_cleanup_(pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN], **pp;
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void *auxerror;
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int r;
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assert(hr);
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assert(secret);
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pwq = pwquality_default_settings();
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if (!pwq)
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return log_oom();
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r = pwquality_read_config(pwq, NULL, &auxerror);
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if (r < 0)
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log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to read libpwquality configuration, ignoring: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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pwquality_maybe_disable_dictionary(pwq);
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/* This is a bit more complex than one might think at first. pwquality_check() would like to know the
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* old password to make security checks. We support arbitrary numbers of passwords however, hence we
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* call the function once for each combination of old and new password. */
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/* Iterate through all new passwords */
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STRV_FOREACH(pp, secret->password) {
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bool called = false;
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char **old;
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r = test_password_many(hr->hashed_password, *pp);
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if (r < 0)
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return r;
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if (r == 0) /* This is an old password as it isn't listed in the hashedPassword field, skip it */
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continue;
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/* Check this password against all old passwords */
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STRV_FOREACH(old, secret->password) {
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if (streq(*pp, *old))
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continue;
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r = test_password_many(hr->hashed_password, *old);
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if (r < 0)
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return r;
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if (r > 0) /* This is a new password, not suitable as old password */
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continue;
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r = pwquality_check(pwq, *pp, *old, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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called = true;
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}
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if (called)
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continue;
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/* If there are no old passwords, let's call pwquality_check() without any. */
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r = pwquality_check(pwq, *pp, NULL, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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}
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return 0;
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}
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#define N_SUGGESTIONS 6
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int suggest_passwords(void) {
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_cleanup_(pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
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_cleanup_strv_free_erase_ char **suggestions = NULL;
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_cleanup_(erase_and_freep) char *joined = NULL;
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN];
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void *auxerror;
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size_t i;
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int r;
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pwq = pwquality_default_settings();
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if (!pwq)
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return log_oom();
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r = pwquality_read_config(pwq, NULL, &auxerror);
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if (r < 0)
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log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to read libpwquality configuration, ignoring: %s",
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pwquality_strerror(buf, sizeof(buf), r, auxerror));
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pwquality_maybe_disable_dictionary(pwq);
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suggestions = new0(char*, N_SUGGESTIONS+1);
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if (!suggestions)
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return log_oom();
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for (i = 0; i < N_SUGGESTIONS; i++) {
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r = pwquality_generate(pwq, 64, suggestions + i);
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if (r < 0)
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return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to generate password, ignoring: %s",
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pwquality_strerror(buf, sizeof(buf), r, NULL));
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}
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joined = strv_join(suggestions, " ");
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if (!joined)
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return log_oom();
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log_info("Password suggestions: %s", joined);
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return 0;
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}
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#else
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int quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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assert(hr);
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assert(secret);
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return 0;
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}
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int suggest_passwords(void) {
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return 0;
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}
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#endif
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@ -1,9 +0,0 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include "sd-bus.h"
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#include "user-record.h"
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int quality_check_password(UserRecord *hr, UserRecord *secret, sd_bus_error *error);
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int suggest_passwords(void);
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90
src/home/user-record-pwquality.c
Normal file
90
src/home/user-record-pwquality.c
Normal file
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@ -0,0 +1,90 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "bus-common-errors.h"
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#include "errno-util.h"
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#include "home-util.h"
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#include "pwquality-util.h"
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#include "strv.h"
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#include "user-record-pwquality.h"
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#include "user-record-util.h"
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#if HAVE_PWQUALITY
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int user_record_quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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_cleanup_(sym_pwquality_free_settingsp) pwquality_settings_t *pwq = NULL;
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char buf[PWQ_MAX_ERROR_MESSAGE_LEN], **pp;
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void *auxerror;
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int r;
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assert(hr);
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assert(secret);
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r = pwq_allocate_context(&pwq);
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if (ERRNO_IS_NOT_SUPPORTED(r))
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return 0;
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if (r < 0)
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return log_debug_errno(r, "Failed to allocate libpwquality context: %m");
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/* This is a bit more complex than one might think at first. pwquality_check() would like to know the
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* old password to make security checks. We support arbitrary numbers of passwords however, hence we
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* call the function once for each combination of old and new password. */
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/* Iterate through all new passwords */
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STRV_FOREACH(pp, secret->password) {
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bool called = false;
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char **old;
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r = test_password_many(hr->hashed_password, *pp);
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if (r < 0)
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return r;
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if (r == 0) /* This is an old password as it isn't listed in the hashedPassword field, skip it */
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continue;
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/* Check this password against all old passwords */
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STRV_FOREACH(old, secret->password) {
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if (streq(*pp, *old))
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continue;
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r = test_password_many(hr->hashed_password, *old);
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if (r < 0)
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return r;
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if (r > 0) /* This is a new password, not suitable as old password */
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continue;
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r = sym_pwquality_check(pwq, *pp, *old, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
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called = true;
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}
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if (called)
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continue;
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/* If there are no old passwords, let's call pwquality_check() without any. */
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r = sym_pwquality_check(pwq, *pp, NULL, hr->user_name, &auxerror);
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if (r < 0)
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return sd_bus_error_setf(error, BUS_ERROR_LOW_PASSWORD_QUALITY, "Password too weak: %s",
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sym_pwquality_strerror(buf, sizeof(buf), r, auxerror));
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}
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return 1;
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}
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#else
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int user_record_quality_check_password(
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UserRecord *hr,
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UserRecord *secret,
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sd_bus_error *error) {
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return 0;
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}
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#endif
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7
src/home/user-record-pwquality.h
Normal file
7
src/home/user-record-pwquality.h
Normal file
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@ -0,0 +1,7 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include "sd-bus.h"
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#include "user-record.h"
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int user_record_quality_check_password(UserRecord *hr, UserRecord *secret, sd_bus_error *error);
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@ -191,6 +191,8 @@ shared_sources = files('''
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pretty-print.h
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ptyfwd.c
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ptyfwd.h
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pwquality-util.c
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pwquality-util.h
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reboot-util.c
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reboot-util.h
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resize-fs.c
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158
src/shared/pwquality-util.c
Normal file
158
src/shared/pwquality-util.c
Normal file
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@ -0,0 +1,158 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <unistd.h>
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#include "dlfcn-util.h"
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#include "errno-util.h"
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#include "log.h"
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#include "macro.h"
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#include "memory-util.h"
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#include "pwquality-util.h"
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#include "strv.h"
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#if HAVE_PWQUALITY
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static void *pwquality_dl = NULL;
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int (*sym_pwquality_check)(pwquality_settings_t *pwq, const char *password, const char *oldpassword, const char *user, void **auxerror);
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pwquality_settings_t *(*sym_pwquality_default_settings)(void);
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void (*sym_pwquality_free_settings)(pwquality_settings_t *pwq);
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int (*sym_pwquality_generate)(pwquality_settings_t *pwq, int entropy_bits, char **password);
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int (*sym_pwquality_get_str_value)(pwquality_settings_t *pwq, int setting, const char **value);
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int (*sym_pwquality_read_config)(pwquality_settings_t *pwq, const char *cfgfile, void **auxerror);
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int (*sym_pwquality_set_int_value)(pwquality_settings_t *pwq, int setting, int value);
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const char* (*sym_pwquality_strerror)(char *buf, size_t len, int errcode, void *auxerror);
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int dlopen_pwquality(void) {
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_cleanup_(dlclosep) void *dl = NULL;
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int r;
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if (pwquality_dl)
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return 0; /* Already loaded */
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dl = dlopen("libpwquality.so.1", RTLD_LAZY);
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if (!dl)
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return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
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"libpwquality support is not installed: %s", dlerror());
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r = dlsym_many_and_warn(
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dl,
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LOG_DEBUG,
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&sym_pwquality_check, "pwquality_check",
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&sym_pwquality_default_settings, "pwquality_default_settings",
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&sym_pwquality_free_settings, "pwquality_free_settings",
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&sym_pwquality_generate, "pwquality_generate",
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&sym_pwquality_get_str_value, "pwquality_get_str_value",
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&sym_pwquality_read_config, "pwquality_read_config",
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&sym_pwquality_set_int_value, "pwquality_set_int_value",
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&sym_pwquality_strerror, "pwquality_strerror",
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NULL);
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if (r < 0)
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return r;
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/* Note that we never release the reference here, because there's no real reason to, after all this
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* was traditionally a regular shared library dependency which lives forever too. */
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pwquality_dl = TAKE_PTR(dl);
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return 1;
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}
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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;
|
||||
}
|
||||
|
||||
#endif
|
34
src/shared/pwquality-util.h
Normal file
34
src/shared/pwquality-util.h
Normal file
|
@ -0,0 +1,34 @@
|
|||
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||||
#pragma once
|
||||
|
||||
#include "macro.h"
|
||||
|
||||
#if HAVE_PWQUALITY
|
||||
/* pwquality.h uses size_t but doesn't include sys/types.h on its own */
|
||||
#include <sys/types.h>
|
||||
#include <pwquality.h>
|
||||
|
||||
extern int (*sym_pwquality_check)(pwquality_settings_t *pwq, const char *password, const char *oldpassword, const char *user, void **auxerror);
|
||||
extern pwquality_settings_t *(*sym_pwquality_default_settings)(void);
|
||||
extern void (*sym_pwquality_free_settings)(pwquality_settings_t *pwq);
|
||||
extern int (*sym_pwquality_generate)(pwquality_settings_t *pwq, int entropy_bits, char **password);
|
||||
extern int (*sym_pwquality_get_str_value)(pwquality_settings_t *pwq, int setting, const char **value);
|
||||
extern int (*sym_pwquality_read_config)(pwquality_settings_t *pwq, const char *cfgfile, void **auxerror);
|
||||
extern int (*sym_pwquality_set_int_value)(pwquality_settings_t *pwq, int setting, int value);
|
||||
extern const char* (*sym_pwquality_strerror)(char *buf, size_t len, int errcode, void *auxerror);
|
||||
|
||||
int dlopen_pwquality(void);
|
||||
|
||||
DEFINE_TRIVIAL_CLEANUP_FUNC(pwquality_settings_t*, sym_pwquality_free_settings);
|
||||
|
||||
void pwq_maybe_disable_dictionary(pwquality_settings_t *pwq);
|
||||
int pwq_allocate_context(pwquality_settings_t **ret);
|
||||
int suggest_passwords(void);
|
||||
|
||||
#else
|
||||
|
||||
static inline int suggest_passwords(void) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
Loading…
Reference in a new issue