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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
4f37cbd9 ZJS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Zbigniew Jędrzejewski-Szmek | |
6 | Copyright 2015 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "acl-util.h" | |
23 | #include "fs-util.h" | |
24 | #include "hashmap.h" | |
25 | #include "journal-internal.h" | |
26 | #include "journal-util.h" | |
27 | #include "log.h" | |
28 | #include "strv.h" | |
29 | #include "user-util.h" | |
30 | ||
31 | static int access_check_var_log_journal(sd_journal *j) { | |
349cc4a5 | 32 | #if HAVE_ACL |
4f37cbd9 ZJS |
33 | _cleanup_strv_free_ char **g = NULL; |
34 | const char* dir; | |
35 | #endif | |
36 | int r; | |
37 | ||
38 | assert(j); | |
39 | ||
40 | /* If we are root, we should have access, don't warn. */ | |
41 | if (getuid() == 0) | |
42 | return 0; | |
43 | ||
44 | /* If we are in the 'systemd-journal' group, we should have | |
45 | * access too. */ | |
46 | r = in_group("systemd-journal"); | |
47 | if (r < 0) | |
48 | return log_error_errno(r, "Failed to check if we are in the 'systemd-journal' group: %m"); | |
49 | if (r > 0) | |
50 | return 0; | |
51 | ||
349cc4a5 | 52 | #if HAVE_ACL |
4f37cbd9 ZJS |
53 | if (laccess("/run/log/journal", F_OK) >= 0) |
54 | dir = "/run/log/journal"; | |
55 | else | |
56 | dir = "/var/log/journal"; | |
57 | ||
58 | /* If we are in any of the groups listed in the journal ACLs, | |
59 | * then all is good, too. Let's enumerate all groups from the | |
60 | * default ACL of the directory, which generally should allow | |
61 | * access to most journal files too. */ | |
62 | r = acl_search_groups(dir, &g); | |
63 | if (r < 0) | |
64 | return log_error_errno(r, "Failed to search journal ACL: %m"); | |
65 | if (r > 0) | |
66 | return 0; | |
67 | ||
68 | /* Print a pretty list, if there were ACLs set. */ | |
69 | if (!strv_isempty(g)) { | |
70 | _cleanup_free_ char *s = NULL; | |
71 | ||
72 | /* Thre are groups in the ACL, let's list them */ | |
73 | r = strv_extend(&g, "systemd-journal"); | |
74 | if (r < 0) | |
75 | return log_oom(); | |
76 | ||
77 | strv_sort(g); | |
78 | strv_uniq(g); | |
79 | ||
80 | s = strv_join(g, "', '"); | |
81 | if (!s) | |
82 | return log_oom(); | |
83 | ||
84 | log_notice("Hint: You are currently not seeing messages from other users and the system.\n" | |
85 | " Users in groups '%s' can see all messages.\n" | |
86 | " Pass -q to turn off this notice.", s); | |
87 | return 1; | |
88 | } | |
89 | #endif | |
90 | ||
91 | /* If no ACLs were found, print a short version of the message. */ | |
92 | log_notice("Hint: You are currently not seeing messages from other users and the system.\n" | |
93 | " Users in the 'systemd-journal' group can see all messages. Pass -q to\n" | |
94 | " turn off this notice."); | |
95 | ||
96 | return 1; | |
97 | } | |
98 | ||
99 | int journal_access_check_and_warn(sd_journal *j, bool quiet) { | |
100 | Iterator it; | |
101 | void *code; | |
102 | char *path; | |
103 | int r = 0; | |
104 | ||
105 | assert(j); | |
106 | ||
107 | if (hashmap_isempty(j->errors)) { | |
108 | if (ordered_hashmap_isempty(j->files) && !quiet) | |
109 | log_notice("No journal files were found."); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | if (hashmap_contains(j->errors, INT_TO_PTR(-EACCES))) { | |
115 | if (!quiet) | |
116 | (void) access_check_var_log_journal(j); | |
117 | ||
118 | if (ordered_hashmap_isempty(j->files)) | |
119 | r = log_error_errno(EACCES, "No journal files were opened due to insufficient permissions."); | |
120 | } | |
121 | ||
122 | HASHMAP_FOREACH_KEY(path, code, j->errors, it) { | |
123 | int err; | |
124 | ||
125 | err = abs(PTR_TO_INT(code)); | |
126 | ||
127 | switch (err) { | |
128 | case EACCES: | |
129 | continue; | |
130 | ||
131 | case ENODATA: | |
132 | log_warning_errno(err, "Journal file %s is truncated, ignoring file.", path); | |
133 | break; | |
134 | ||
135 | case EPROTONOSUPPORT: | |
136 | log_warning_errno(err, "Journal file %1$s uses an unsupported feature, ignoring file.\n" | |
137 | "Use SYSTEMD_LOG_LEVEL=debug journalctl --file=%1$s to see the details.", | |
138 | path); | |
139 | break; | |
140 | ||
141 | case EBADMSG: | |
142 | log_warning_errno(err, "Journal file %s corrupted, ignoring file.", path); | |
143 | break; | |
144 | ||
145 | default: | |
146 | log_warning_errno(err, "An error was encountered while opening journal file or directory %s, ignoring file: %m", path); | |
147 | break; | |
148 | } | |
149 | } | |
150 | ||
151 | return r; | |
152 | } | |
53978b98 LP |
153 | |
154 | bool journal_field_valid(const char *p, size_t l, bool allow_protected) { | |
155 | const char *a; | |
156 | ||
157 | /* We kinda enforce POSIX syntax recommendations for | |
158 | environment variables here, but make a couple of additional | |
159 | requirements. | |
160 | ||
161 | http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */ | |
162 | ||
163 | if (l == (size_t) -1) | |
164 | l = strlen(p); | |
165 | ||
166 | /* No empty field names */ | |
167 | if (l <= 0) | |
168 | return false; | |
169 | ||
170 | /* Don't allow names longer than 64 chars */ | |
171 | if (l > 64) | |
172 | return false; | |
173 | ||
174 | /* Variables starting with an underscore are protected */ | |
175 | if (!allow_protected && p[0] == '_') | |
176 | return false; | |
177 | ||
178 | /* Don't allow digits as first character */ | |
179 | if (p[0] >= '0' && p[0] <= '9') | |
180 | return false; | |
181 | ||
182 | /* Only allow A-Z0-9 and '_' */ | |
183 | for (a = p; a < p + l; a++) | |
184 | if ((*a < 'A' || *a > 'Z') && | |
185 | (*a < '0' || *a > '9') && | |
186 | *a != '_') | |
187 | return false; | |
188 | ||
189 | return true; | |
190 | } |