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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/shared/user-record-nss.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/shared/user-record-nss.c | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/src/shared/user-record-nss.c b/src/shared/user-record-nss.c new file mode 100644 index 0000000..88b8fc2 --- /dev/null +++ b/src/shared/user-record-nss.c @@ -0,0 +1,531 @@ +/* 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; +} |