| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include "errno-util.h" |
| #include "format-util.h" |
| #include "libcrypt-util.h" |
| #include "strv.h" |
| #include "user-record-nss.h" |
| #include "user-util.h" |
| #include "utf8.h" |
| |
| #define SET_IF(field, condition, value, fallback) \ |
| field = (condition) ? (value) : (fallback) |
| |
| static inline const char* utf8_only(const char *s) { |
| return s && utf8_is_valid(s) ? s : NULL; |
| } |
| |
| static inline int strv_extend_strv_utf8_only(char ***dst, char **src, bool filter_duplicates) { |
| _cleanup_free_ char **t = NULL; |
| size_t l, j = 0; |
| |
| /* First, do a shallow copy of s, filtering for only valid utf-8 strings */ |
| l = strv_length(src); |
| t = new(char*, l + 1); |
| if (!t) |
| return -ENOMEM; |
| |
| for (size_t i = 0; i < l; i++) |
| if (utf8_is_valid(src[i])) |
| t[j++] = src[i]; |
| if (j == 0) |
| return 0; |
| |
| t[j] = NULL; |
| return strv_extend_strv(dst, t, filter_duplicates); |
| } |
| |
| 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, utf8_only(empty_to_null(pwd->pw_dir))); |
| if (r < 0) |
| return r; |
| |
| r = free_and_strdup(&hr->shell, utf8_only(empty_to_null(pwd->pw_shell))); |
| if (r < 0) |
| return r; |
| |
| hr->uid = pwd->pw_uid; |
| hr->gid = pwd->pw_gid; |
| |
| if (spwd && |
| looks_like_hashed_password(utf8_only(spwd->sp_pwdp))) { /* Ignore locked, disabled, and mojibake passwords */ |
| 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; |
| } |
| |
| int nss_group_to_group_record( |
| const struct group *grp, |
| const struct sgrp *sgrp, |
| GroupRecord **ret) { |
| |
| _cleanup_(group_record_unrefp) GroupRecord *g = NULL; |
| int r; |
| |
| assert(grp); |
| assert(ret); |
| |
| if (isempty(grp->gr_name)) |
| return -EINVAL; |
| |
| if (sgrp && !streq_ptr(sgrp->sg_namp, grp->gr_name)) |
| return -EINVAL; |
| |
| g = group_record_new(); |
| if (!g) |
| return -ENOMEM; |
| |
| g->group_name = strdup(grp->gr_name); |
| if (!g->group_name) |
| return -ENOMEM; |
| |
| r = strv_extend_strv_utf8_only(&g->members, grp->gr_mem, false); |
| if (r < 0) |
| return r; |
| |
| g->gid = grp->gr_gid; |
| |
| if (sgrp) { |
| if (looks_like_hashed_password(utf8_only(sgrp->sg_passwd))) { |
| g->hashed_password = strv_new(sgrp->sg_passwd); |
| if (!g->hashed_password) |
| return -ENOMEM; |
| } |
| |
| r = strv_extend_strv_utf8_only(&g->members, sgrp->sg_mem, true); |
| if (r < 0) |
| return r; |
| |
| r = strv_extend_strv_utf8_only(&g->administrators, sgrp->sg_adm, false); |
| if (r < 0) |
| return r; |
| } |
| |
| r = json_build(&g->json, JSON_BUILD_OBJECT( |
| JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name)), |
| JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(g->gid)), |
| JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->members), "members", JSON_BUILD_STRV(g->members)), |
| JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->hashed_password), "privileged", JSON_BUILD_OBJECT(JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRV(g->hashed_password)))), |
| JSON_BUILD_PAIR_CONDITION(!strv_isempty(g->administrators), "administrators", JSON_BUILD_STRV(g->administrators)))); |
| if (r < 0) |
| return r; |
| |
| g->mask = USER_RECORD_REGULAR | |
| (!strv_isempty(g->hashed_password) ? USER_RECORD_PRIVILEGED : 0); |
| |
| *ret = TAKE_PTR(g); |
| return 0; |
| } |
| |
| int nss_sgrp_for_group(const struct group *grp, struct sgrp *ret_sgrp, char **ret_buffer) { |
| size_t buflen = 4096; |
| int r; |
| |
| assert(grp); |
| assert(ret_sgrp); |
| assert(ret_buffer); |
| |
| for (;;) { |
| _cleanup_free_ char *buf = NULL; |
| struct sgrp sgrp, *result; |
| |
| buf = malloc(buflen); |
| if (!buf) |
| return -ENOMEM; |
| |
| r = getsgnam_r(grp->gr_name, &sgrp, buf, buflen, &result); |
| if (r == 0) { |
| if (!result) |
| return -ESRCH; |
| |
| *ret_sgrp = *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_group_record_by_name( |
| const char *name, |
| bool with_shadow, |
| GroupRecord **ret) { |
| |
| _cleanup_free_ char *buf = NULL, *sbuf = NULL; |
| struct group grp, *result; |
| bool incomplete = false; |
| size_t buflen = 4096; |
| struct sgrp sgrp, *sresult = NULL; |
| int r; |
| |
| assert(name); |
| assert(ret); |
| |
| for (;;) { |
| buf = malloc(buflen); |
| if (!buf) |
| return -ENOMEM; |
| |
| r = getgrnam_r(name, &grp, buf, buflen, &result); |
| if (r == 0) { |
| if (!result) |
| return -ESRCH; |
| |
| break; |
| } |
| |
| if (r < 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getgrnam_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_sgrp_for_group(result, &sgrp, &sbuf); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to do shadow lookup for group %s, ignoring: %m", result->gr_name); |
| incomplete = ERRNO_IS_PRIVILEGE(r); |
| } else |
| sresult = &sgrp; |
| } else |
| incomplete = true; |
| |
| r = nss_group_to_group_record(result, sresult, ret); |
| if (r < 0) |
| return r; |
| |
| (*ret)->incomplete = incomplete; |
| return 0; |
| } |
| |
| int nss_group_record_by_gid( |
| gid_t gid, |
| bool with_shadow, |
| GroupRecord **ret) { |
| |
| _cleanup_free_ char *buf = NULL, *sbuf = NULL; |
| struct group grp, *result; |
| bool incomplete = false; |
| size_t buflen = 4096; |
| struct sgrp sgrp, *sresult = NULL; |
| int r; |
| |
| assert(ret); |
| |
| for (;;) { |
| buf = malloc(buflen); |
| if (!buf) |
| return -ENOMEM; |
| |
| r = getgrgid_r(gid, &grp, buf, buflen, &result); |
| if (r == 0) { |
| if (!result) |
| return -ESRCH; |
| break; |
| } |
| |
| if (r < 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(EIO), "getgrgid_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_sgrp_for_group(result, &sgrp, &sbuf); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to do shadow lookup for group %s, ignoring: %m", result->gr_name); |
| incomplete = ERRNO_IS_PRIVILEGE(r); |
| } else |
| sresult = &sgrp; |
| } else |
| incomplete = true; |
| |
| r = nss_group_to_group_record(result, sresult, ret); |
| if (r < 0) |
| return r; |
| |
| (*ret)->incomplete = incomplete; |
| return 0; |
| } |
