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authorLennart Poettering <lennart@poettering.net>2015-04-22 22:54:23 +0200
committerLennart Poettering <lennart@poettering.net>2015-04-22 22:56:24 +0200
commite346512c684e9efae84c6442f7e6a5781564ecde (patch)
tree7aa37e80d4f1e27e89017b8898b355c62f5cd918 /src/journal/journalctl.c
parent0a0215783159b9c3a3652b231df36dbff08e0ac5 (diff)
journalctl: rework code that checks whether we have access to /var/log/journal
- fix some memory leaks on error conditions - handle all error cases properly, and log about failures - move HAVE_ACL and no-HAVE_ACL code closer to each other
Diffstat (limited to 'src/journal/journalctl.c')
-rw-r--r--src/journal/journalctl.c120
1 files changed, 62 insertions, 58 deletions
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index a5ed41d84b..666aa20480 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1524,61 +1524,76 @@ static int verify(sd_journal *j) {
return r;
}
-#ifdef HAVE_ACL
static int access_check_var_log_journal(sd_journal *j) {
+#ifdef HAVE_ACL
_cleanup_strv_free_ char **g = NULL;
- bool have_access;
+ const char* dir;
+#endif
int r;
assert(j);
- have_access = in_group("systemd-journal") > 0;
+ if (arg_quiet)
+ return 0;
- if (!have_access) {
- const char* dir;
+ /* If we are root, we should have access, don't warn. */
+ if (getuid() == 0)
+ return 0;
- if (access("/run/log/journal", F_OK) >= 0)
- dir = "/run/log/journal";
- else
- dir = "/var/log/journal";
+ /* 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;
- /* Let's enumerate all groups from the default ACL of
- * the directory, which generally should allow access
- * to most journal files too */
- r = search_acl_groups(&g, dir, &have_access);
- if (r < 0)
- return r;
- }
+#ifdef HAVE_ACL
+ if (laccess("/run/log/journal", F_OK) >= 0)
+ dir = "/run/log/journal";
+ else
+ dir = "/var/log/journal";
- if (!have_access) {
+ /* 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;
- if (strv_isempty(g))
- 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.");
- else {
- _cleanup_free_ char *s = NULL;
+ /* Print a pretty list, if there were ACLs set. */
+ if (!strv_isempty(g)) {
+ _cleanup_free_ char *s = NULL;
- r = strv_extend(&g, "systemd-journal");
- if (r < 0)
- return log_oom();
+ /* 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);
+ strv_sort(g);
+ strv_uniq(g);
- s = strv_join(g, "', '");
- if (!s)
- return log_oom();
+ 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);
- }
+ 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
- return 0;
+ /* 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;
}
-#endif
static int access_check(sd_journal *j) {
Iterator it;
@@ -1590,30 +1605,15 @@ static int access_check(sd_journal *j) {
if (set_isempty(j->errors)) {
if (ordered_hashmap_isempty(j->files))
log_notice("No journal files were found.");
+
return 0;
}
if (set_contains(j->errors, INT_TO_PTR(-EACCES))) {
-#ifdef HAVE_ACL
- /* If /run/log/journal or /var/log/journal exist, try
- to pring a nice notice if the user lacks access to it. */
- if (!arg_quiet && geteuid() != 0) {
- r = access_check_var_log_journal(j);
- if (r < 0)
- return r;
- }
-#else
- if (geteuid() != 0 && in_group("systemd-journal") <= 0) {
- log_error("Unprivileged users cannot access messages. Users in the 'systemd-journal' group\n"
- "group may access messages.");
- return -EACCES;
- }
-#endif
+ (void) access_check_var_log_journal(j);
- if (ordered_hashmap_isempty(j->files)) {
- log_error("No journal files were opened due to insufficient permissions.");
- r = -EACCES;
- }
+ if (ordered_hashmap_isempty(j->files))
+ r = log_error_errno(EACCES, "No journal files were opened due to insufficient permissions.");
}
SET_FOREACH(code, j->errors, it) {
@@ -1622,8 +1622,12 @@ static int access_check(sd_journal *j) {
err = -PTR_TO_INT(code);
assert(err > 0);
- if (err != EACCES)
- log_warning_errno(err, "Error was encountered while opening journal files: %m");
+ if (err == EACCES)
+ continue;
+
+ log_warning_errno(err, "Error was encountered while opening journal files: %m");
+ if (r == 0)
+ r = -err;
}
return r;