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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "path-util.h"
#include "stdio-util.h"
#include "user-util.h"
#include "userdb-dropin.h"
static int load_user(
FILE *f,
const char *path,
const char *name,
uid_t uid,
UserDBFlags flags,
UserRecord **ret) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(user_record_unrefp) UserRecord *u = NULL;
bool have_privileged;
int r;
assert(f);
r = json_parse_file(f, path, 0, &v, NULL, NULL);
if (r < 0)
return r;
if (FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW) || !path || !(name || uid_is_valid(uid)))
have_privileged = false;
else {
_cleanup_(json_variant_unrefp) JsonVariant *privileged_v = NULL;
_cleanup_free_ char *d = NULL, *j = NULL;
/* Let's load the "privileged" section from a companion file. But only if USERDB_AVOID_SHADOW
* is not set. After all, the privileged section kinda takes the role of the data from the
* shadow file, hence it makes sense to use the same flag here.
*
* The general assumption is that whoever provides these records makes the .user file
* world-readable, but the .privilege file readable to root and the assigned UID only. But we
* won't verify that here, as it would be too late. */
r = path_extract_directory(path, &d);
if (r < 0)
return r;
if (name) {
j = strjoin(d, "/", name, ".user-privileged");
if (!j)
return -ENOMEM;
} else {
assert(uid_is_valid(uid));
if (asprintf(&j, "%s/" UID_FMT ".user-privileged", d, uid) < 0)
return -ENOMEM;
}
r = json_parse_file(NULL, j, JSON_PARSE_SENSITIVE, &privileged_v, NULL, NULL);
if (ERRNO_IS_NEG_PRIVILEGE(r))
have_privileged = false;
else if (r == -ENOENT)
have_privileged = true; /* if the privileged file doesn't exist, we are complete */
else if (r < 0)
return r;
else {
r = json_variant_merge_object(&v, privileged_v);
if (r < 0)
return r;
have_privileged = true;
}
}
u = user_record_new();
if (!u)
return -ENOMEM;
r = user_record_load(
u, v,
USER_RECORD_REQUIRE_REGULAR|
USER_RECORD_ALLOW_PER_MACHINE|
USER_RECORD_ALLOW_BINDING|
USER_RECORD_ALLOW_SIGNATURE|
(have_privileged ? USER_RECORD_ALLOW_PRIVILEGED : 0)|
USER_RECORD_PERMISSIVE);
if (r < 0)
return r;
if (name && !streq_ptr(name, u->user_name))
return -EINVAL;
if (uid_is_valid(uid) && uid != u->uid)
return -EINVAL;
u->incomplete = !have_privileged;
if (ret)
*ret = TAKE_PTR(u);
return 0;
}
int dropin_user_record_by_name(const char *name, const char *path, UserDBFlags flags, UserRecord **ret) {
_cleanup_free_ char *found_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(name);
if (path) {
f = fopen(path, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno; /* We generally want ESRCH to indicate no such user */
} else {
const char *j;
j = strjoina(name, ".user");
if (!filename_is_valid(j)) /* Doesn't qualify as valid filename? Then it's definitely not provided as a drop-in */
return -ESRCH;
r = search_and_fopen_nulstr(j, "re", NULL, USERDB_DROPIN_DIR_NULSTR("userdb"), &f, &found_path);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
path = found_path;
}
return load_user(f, path, name, UID_INVALID, flags, ret);
}
int dropin_user_record_by_uid(uid_t uid, const char *path, UserDBFlags flags, UserRecord **ret) {
_cleanup_free_ char *found_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(uid_is_valid(uid));
if (path) {
f = fopen(path, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
} else {
char buf[DECIMAL_STR_MAX(uid_t) + STRLEN(".user") + 1];
xsprintf(buf, UID_FMT ".user", uid);
/* Note that we don't bother to validate this as a filename, as this is generated from a decimal
* integer, i.e. is definitely OK as a filename */
r = search_and_fopen_nulstr(buf, "re", NULL, USERDB_DROPIN_DIR_NULSTR("userdb"), &f, &found_path);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
path = found_path;
}
return load_user(f, path, NULL, uid, flags, ret);
}
static int load_group(
FILE *f,
const char *path,
const char *name,
gid_t gid,
UserDBFlags flags,
GroupRecord **ret) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(group_record_unrefp) GroupRecord *g = NULL;
bool have_privileged;
int r;
assert(f);
r = json_parse_file(f, path, 0, &v, NULL, NULL);
if (r < 0)
return r;
if (FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW) || !path || !(name || gid_is_valid(gid)))
have_privileged = false;
else {
_cleanup_(json_variant_unrefp) JsonVariant *privileged_v = NULL;
_cleanup_free_ char *d = NULL, *j = NULL;
r = path_extract_directory(path, &d);
if (r < 0)
return r;
if (name) {
j = strjoin(d, "/", name, ".group-privileged");
if (!j)
return -ENOMEM;
} else {
assert(gid_is_valid(gid));
if (asprintf(&j, "%s/" GID_FMT ".group-privileged", d, gid) < 0)
return -ENOMEM;
}
r = json_parse_file(NULL, j, JSON_PARSE_SENSITIVE, &privileged_v, NULL, NULL);
if (ERRNO_IS_NEG_PRIVILEGE(r))
have_privileged = false;
else if (r == -ENOENT)
have_privileged = true; /* if the privileged file doesn't exist, we are complete */
else if (r < 0)
return r;
else {
r = json_variant_merge_object(&v, privileged_v);
if (r < 0)
return r;
have_privileged = true;
}
}
g = group_record_new();
if (!g)
return -ENOMEM;
r = group_record_load(
g, v,
USER_RECORD_REQUIRE_REGULAR|
USER_RECORD_ALLOW_PER_MACHINE|
USER_RECORD_ALLOW_BINDING|
USER_RECORD_ALLOW_SIGNATURE|
(have_privileged ? USER_RECORD_ALLOW_PRIVILEGED : 0)|
USER_RECORD_PERMISSIVE);
if (r < 0)
return r;
if (name && !streq_ptr(name, g->group_name))
return -EINVAL;
if (gid_is_valid(gid) && gid != g->gid)
return -EINVAL;
g->incomplete = !have_privileged;
if (ret)
*ret = TAKE_PTR(g);
return 0;
}
int dropin_group_record_by_name(const char *name, const char *path, UserDBFlags flags, GroupRecord **ret) {
_cleanup_free_ char *found_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(name);
if (path) {
f = fopen(path, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
} else {
const char *j;
j = strjoina(name, ".group");
if (!filename_is_valid(j)) /* Doesn't qualify as valid filename? Then it's definitely not provided as a drop-in */
return -ESRCH;
r = search_and_fopen_nulstr(j, "re", NULL, USERDB_DROPIN_DIR_NULSTR("userdb"), &f, &found_path);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
path = found_path;
}
return load_group(f, path, name, GID_INVALID, flags, ret);
}
int dropin_group_record_by_gid(gid_t gid, const char *path, UserDBFlags flags, GroupRecord **ret) {
_cleanup_free_ char *found_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(gid_is_valid(gid));
if (path) {
f = fopen(path, "re");
if (!f)
return errno == ENOENT ? -ESRCH : -errno;
} else {
char buf[DECIMAL_STR_MAX(gid_t) + STRLEN(".group") + 1];
xsprintf(buf, GID_FMT ".group", gid);
r = search_and_fopen_nulstr(buf, "re", NULL, USERDB_DROPIN_DIR_NULSTR("userdb"), &f, &found_path);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
path = found_path;
}
return load_group(f, path, NULL, gid, flags, ret);
}
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