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Systemd/src/shared/user-record-nss.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "errno-util.h"
#include "format-util.h"
#include "libcrypt-util.h"
#include "strv.h"
#include "user-record-nss.h"
#include "user-util.h"
#define SET_IF(field, condition, value, fallback) \
field = (condition) ? (value) : (fallback)
int nss_passwd_to_user_record(
const struct passwd *pwd,
const struct spwd *spwd,
UserRecord **ret) {
_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
int r;
assert(pwd);
assert(ret);
if (isempty(pwd->pw_name))
return -EINVAL;
if (spwd && !streq_ptr(spwd->sp_namp, pwd->pw_name))
return -EINVAL;
hr = user_record_new();
if (!hr)
return -ENOMEM;
r = free_and_strdup(&hr->user_name, pwd->pw_name);
if (r < 0)
return r;
/* Some bad NSS modules synthesize GECOS fields with embedded ":" or "\n" characters, which are not
* something we can output in /etc/passwd compatible format, since these are record separators
* there. We normally refuse that, but we need to maintain compatibility with arbitrary NSS modules,
* hence let's do what glibc does: mangle the data to fit the format. */
if (isempty(pwd->pw_gecos) || streq_ptr(pwd->pw_gecos, hr->user_name))
hr->real_name = mfree(hr->real_name);
else if (valid_gecos(pwd->pw_gecos)) {
r = free_and_strdup(&hr->real_name, pwd->pw_gecos);
if (r < 0)
return r;
} else {
_cleanup_free_ char *mangled = NULL;
mangled = mangle_gecos(pwd->pw_gecos);
if (!mangled)
return -ENOMEM;
free_and_replace(hr->real_name, mangled);
}
r = free_and_strdup(&hr->home_directory, empty_to_null(pwd->pw_dir));
if (r < 0)
return r;
r = free_and_strdup(&hr->shell, empty_to_null(pwd->pw_shell));
if (r < 0)
return r;
hr->uid = pwd->pw_uid;
hr->gid = pwd->pw_gid;
if (spwd && hashed_password_valid(spwd->sp_pwdp)) {
strv_free_erase(hr->hashed_password);
hr->hashed_password = strv_new(spwd->sp_pwdp);
if (!hr->hashed_password)
return -ENOMEM;
} else
hr->hashed_password = strv_free_erase(hr->hashed_password);
/* shadow-utils suggests using "chage -E 0" (or -E 1, depending on which man page you check)
* for locking a whole account, hence check for that. Note that it also defines a way to lock
* just a password instead of the whole account, but that's mostly pointless in times of
* password-less authorization, hence let's not bother. */
SET_IF(hr->locked,
spwd && spwd->sp_expire >= 0,
spwd->sp_expire <= 1, -1);
SET_IF(hr->not_after_usec,
spwd && spwd->sp_expire > 1 && (uint64_t) spwd->sp_expire < (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_expire * USEC_PER_DAY, UINT64_MAX);
SET_IF(hr->password_change_now,
spwd && spwd->sp_lstchg >= 0,
spwd->sp_lstchg == 0, -1);
SET_IF(hr->last_password_change_usec,
spwd && spwd->sp_lstchg > 0 && (uint64_t) spwd->sp_lstchg <= (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_lstchg * USEC_PER_DAY, UINT64_MAX);
SET_IF(hr->password_change_min_usec,
spwd && spwd->sp_min > 0 && (uint64_t) spwd->sp_min <= (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_min * USEC_PER_DAY, UINT64_MAX);
SET_IF(hr->password_change_max_usec,
spwd && spwd->sp_max > 0 && (uint64_t) spwd->sp_max <= (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_max * USEC_PER_DAY, UINT64_MAX);
SET_IF(hr->password_change_warn_usec,
spwd && spwd->sp_warn > 0 && (uint64_t) spwd->sp_warn <= (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_warn * USEC_PER_DAY, UINT64_MAX);
SET_IF(hr->password_change_inactive_usec,
spwd && spwd->sp_inact > 0 && (uint64_t) spwd->sp_inact <= (UINT64_MAX-1)/USEC_PER_DAY,
spwd->sp_inact * USEC_PER_DAY, UINT64_MAX);
hr->json = json_variant_unref(hr->json);
r = json_build(&hr->json, JSON_BUILD_OBJECT(
JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(hr->user_name)),
JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(hr->uid)),
JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(hr->gid)),
JSON_BUILD_PAIR_CONDITION(hr->real_name, "realName", JSON_BUILD_STRING(hr->real_name)),
JSON_BUILD_PAIR_CONDITION(hr->home_directory, "homeDirectory", JSON_BUILD_STRING(hr->home_directory)),
JSON_BUILD_PAIR_CONDITION(hr->shell, "shell", JSON_BUILD_STRING(hr->shell)),
JSON_BUILD_PAIR_CONDITION(!strv_isempty(hr->hashed_password), "privileged", JSON_BUILD_OBJECT(JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRV(hr->hashed_password)))),
JSON_BUILD_PAIR_CONDITION(hr->locked >= 0, "locked", JSON_BUILD_BOOLEAN(hr->locked)),
JSON_BUILD_PAIR_CONDITION(hr->not_after_usec != UINT64_MAX, "notAfterUSec", JSON_BUILD_UNSIGNED(hr->not_after_usec)),
JSON_BUILD_PAIR_CONDITION(hr->password_change_now >= 0, "passwordChangeNow", JSON_BUILD_BOOLEAN(hr->password_change_now)),
JSON_BUILD_PAIR_CONDITION(hr->last_password_change_usec != UINT64_MAX, "lastPasswordChangeUSec", JSON_BUILD_UNSIGNED(hr->last_password_change_usec)),
JSON_BUILD_PAIR_CONDITION(hr->password_change_min_usec != UINT64_MAX, "passwordChangeMinUSec", JSON_BUILD_UNSIGNED(hr->password_change_min_usec)),
JSON_BUILD_PAIR_CONDITION(hr->password_change_max_usec != UINT64_MAX, "passwordChangeMaxUSec", JSON_BUILD_UNSIGNED(hr->password_change_max_usec)),
JSON_BUILD_PAIR_CONDITION(hr->password_change_warn_usec != UINT64_MAX, "passwordChangeWarnUSec", JSON_BUILD_UNSIGNED(hr->password_change_warn_usec)),
JSON_BUILD_PAIR_CONDITION(hr->password_change_inactive_usec != UINT64_MAX, "passwordChangeInactiveUSec", JSON_BUILD_UNSIGNED(hr->password_change_inactive_usec))));
if (r < 0)
return r;
hr->mask = USER_RECORD_REGULAR |
(!strv_isempty(hr->hashed_password) ? USER_RECORD_PRIVILEGED : 0);
*ret = TAKE_PTR(hr);
return 0;
}
int nss_spwd_for_passwd(const struct passwd *pwd, struct spwd *ret_spwd, char **ret_buffer) {
size_t buflen = 4096;
int r;
assert(pwd);
assert(ret_spwd);
assert(ret_buffer);
for (;;) {
_cleanup_free_ char *buf = NULL;
struct spwd spwd, *result;
buf = malloc(buflen);
if (!buf)
return -ENOMEM;
r = getspnam_r(pwd->pw_name, &spwd, buf, buflen, &result);
if (r == 0) {
if (!result)
return -ESRCH;
*ret_spwd = *result;
*ret_buffer = TAKE_PTR(buf);
return 0;
}
if (r < 0)
return -EIO; /* Weird, this should not return negative! */
if (r != ERANGE)
return -r;
if (buflen > SIZE_MAX / 2)
return -ERANGE;
buflen *= 2;
buf = mfree(buf);
}
}
int nss_user_record_by_name(
const char *name,
bool with_shadow,
UserRecord **ret) {
_cleanup_free_ char *buf = NULL, *sbuf = NULL;
struct passwd pwd, *result;
bool incomplete = false;
size_t buflen = 4096;
struct spwd spwd, *sresult = NULL;
int r;
assert(name);
assert(ret);
for (;;) {
buf = malloc(buflen);
if (!buf)
return -ENOMEM;
r = getpwnam_r(name, &pwd, buf, buflen, &result);
if (r == 0) {
if (!result)
return -ESRCH;
break;
}
if (r < 0)
return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getpwnam_r() returned a negative value");
if (r != ERANGE)
return -r;
if (buflen > SIZE_MAX / 2)
return -ERANGE;
buflen *= 2;
buf = mfree(buf);
}
if (with_shadow) {
r = nss_spwd_for_passwd(result, &spwd, &sbuf);
if (r < 0) {
log_debug_errno(r, "Failed to do shadow lookup for user %s, ignoring: %m", name);
incomplete = ERRNO_IS_PRIVILEGE(r);
} else
sresult = &spwd;
} else
incomplete = true;
r = nss_passwd_to_user_record(result, sresult, ret);
if (r < 0)
return r;
(*ret)->incomplete = incomplete;
return 0;
}
int nss_user_record_by_uid(
uid_t uid,
bool with_shadow,
UserRecord **ret) {
_cleanup_free_ char *buf = NULL, *sbuf = NULL;
struct passwd pwd, *result;
bool incomplete = false;
size_t buflen = 4096;
struct spwd spwd, *sresult = NULL;
int r;
assert(ret);
for (;;) {
buf = malloc(buflen);
if (!buf)
return -ENOMEM;
r = getpwuid_r(uid, &pwd, buf, buflen, &result);
if (r == 0) {
if (!result)
return -ESRCH;
break;
}
if (r < 0)
return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getpwuid_r() returned a negative value");
if (r != ERANGE)
return -r;
if (buflen > SIZE_MAX / 2)
return -ERANGE;
buflen *= 2;
buf = mfree(buf);
}
if (with_shadow) {
r = nss_spwd_for_passwd(result, &spwd, &sbuf);
if (r < 0) {
log_debug_errno(r, "Failed to do shadow lookup for UID " UID_FMT ", ignoring: %m", uid);
incomplete = ERRNO_IS_PRIVILEGE(r);
} else
sresult = &spwd;
} else
incomplete = true;
r = nss_passwd_to_user_record(result, sresult, ret);
if (r < 0)
return r;
(*ret)->incomplete = incomplete;
return 0;
}
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