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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2013 Zbigniew Jędrzejewski-Szmek
Copyright 2015 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "acl-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "journal-internal.h"
#include "journal-util.h"
#include "log.h"
#include "strv.h"
#include "user-util.h"
static int access_check_var_log_journal(sd_journal *j) {
#if HAVE_ACL
_cleanup_strv_free_ char **g = NULL;
const char* dir;
#endif
int r;
assert(j);
/* If we are root, we should have access, don't warn. */
if (getuid() == 0)
return 0;
/* If we are in the 'systemd-journal' group, we should have
* access too. */
r = in_group("systemd-journal");
if (r < 0)
return log_error_errno(r, "Failed to check if we are in the 'systemd-journal' group: %m");
if (r > 0)
return 0;
#if HAVE_ACL
if (laccess("/run/log/journal", F_OK) >= 0)
dir = "/run/log/journal";
else
dir = "/var/log/journal";
/* If we are in any of the groups listed in the journal ACLs,
* then all is good, too. Let's enumerate all groups from the
* default ACL of the directory, which generally should allow
* access to most journal files too. */
r = acl_search_groups(dir, &g);
if (r < 0)
return log_error_errno(r, "Failed to search journal ACL: %m");
if (r > 0)
return 0;
/* Print a pretty list, if there were ACLs set. */
if (!strv_isempty(g)) {
_cleanup_free_ char *s = NULL;
/* Thre are groups in the ACL, let's list them */
r = strv_extend(&g, "systemd-journal");
if (r < 0)
return log_oom();
strv_sort(g);
strv_uniq(g);
s = strv_join(g, "', '");
if (!s)
return log_oom();
log_notice("Hint: You are currently not seeing messages from other users and the system.\n"
" Users in groups '%s' can see all messages.\n"
" Pass -q to turn off this notice.", s);
return 1;
}
#endif
/* If no ACLs were found, print a short version of the message. */
log_notice("Hint: You are currently not seeing messages from other users and the system.\n"
" Users in the 'systemd-journal' group can see all messages. Pass -q to\n"
" turn off this notice.");
return 1;
}
int journal_access_check_and_warn(sd_journal *j, bool quiet) {
Iterator it;
void *code;
char *path;
int r = 0;
assert(j);
if (hashmap_isempty(j->errors)) {
if (ordered_hashmap_isempty(j->files) && !quiet)
log_notice("No journal files were found.");
return 0;
}
if (hashmap_contains(j->errors, INT_TO_PTR(-EACCES))) {
if (!quiet)
(void) access_check_var_log_journal(j);
if (ordered_hashmap_isempty(j->files))
r = log_error_errno(EACCES, "No journal files were opened due to insufficient permissions.");
}
HASHMAP_FOREACH_KEY(path, code, j->errors, it) {
int err;
err = abs(PTR_TO_INT(code));
switch (err) {
case EACCES:
continue;
case ENODATA:
log_warning_errno(err, "Journal file %s is truncated, ignoring file.", path);
break;
case EPROTONOSUPPORT:
log_warning_errno(err, "Journal file %1$s uses an unsupported feature, ignoring file.\n"
"Use SYSTEMD_LOG_LEVEL=debug journalctl --file=%1$s to see the details.",
path);
break;
case EBADMSG:
log_warning_errno(err, "Journal file %s corrupted, ignoring file.", path);
break;
default:
log_warning_errno(err, "An error was encountered while opening journal file or directory %s, ignoring file: %m", path);
break;
}
}
return r;
}
bool journal_field_valid(const char *p, size_t l, bool allow_protected) {
const char *a;
/* We kinda enforce POSIX syntax recommendations for
environment variables here, but make a couple of additional
requirements.
http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
if (l == (size_t) -1)
l = strlen(p);
/* No empty field names */
if (l <= 0)
return false;
/* Don't allow names longer than 64 chars */
if (l > 64)
return false;
/* Variables starting with an underscore are protected */
if (!allow_protected && p[0] == '_')
return false;
/* Don't allow digits as first character */
if (p[0] >= '0' && p[0] <= '9')
return false;
/* Only allow A-Z0-9 and '_' */
for (a = p; a < p + l; a++)
if ((*a < 'A' || *a > 'Z') &&
(*a < '0' || *a > '9') &&
*a != '_')
return false;
return true;
}
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