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journal: move valid_user_field() to journal-util.[ch] and rename it → journal_field_valid()
Being able to validate journal field names is useful outside of the journal itself.
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@ -28,6 +28,7 @@
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#include "fs-util.h"
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#include "io-util.h"
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#include "journal-importer.h"
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#include "journal-util.h"
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#include "journald-console.h"
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#include "journald-kmsg.h"
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#include "journald-native.h"
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@ -43,41 +44,6 @@
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#include "string-util.h"
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#include "unaligned.h"
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bool valid_user_field(const char *p, size_t l, bool allow_protected) {
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const char *a;
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/* We kinda enforce POSIX syntax recommendations for
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environment variables here, but make a couple of additional
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requirements.
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http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
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/* No empty field names */
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if (l <= 0)
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return false;
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/* Don't allow names longer than 64 chars */
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if (l > 64)
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return false;
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/* Variables starting with an underscore are protected */
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if (!allow_protected && p[0] == '_')
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return false;
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/* Don't allow digits as first character */
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if (p[0] >= '0' && p[0] <= '9')
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return false;
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/* Only allow A-Z0-9 and '_' */
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for (a = p; a < p + l; a++)
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if ((*a < 'A' || *a > 'Z') &&
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(*a < '0' || *a > '9') &&
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*a != '_')
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return false;
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return true;
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}
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static bool allow_object_pid(const struct ucred *ucred) {
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return ucred && ucred->uid == 0;
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}
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@ -201,7 +167,7 @@ static int server_process_entry(
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q = memchr(p, '=', e - p);
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if (q) {
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if (valid_user_field(p, q - p, false)) {
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if (journal_field_valid(p, q - p, false)) {
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size_t l;
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l = e - p;
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@ -257,7 +223,7 @@ static int server_process_entry(
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k[e - p] = '=';
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memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
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if (valid_user_field(p, e - p, false)) {
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if (journal_field_valid(p, e - p, false)) {
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iovec[n].iov_base = k;
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iovec[n].iov_len = (e - p) + 1 + l;
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entry_size += iovec[n].iov_len;
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@ -149,3 +149,41 @@ int journal_access_check_and_warn(sd_journal *j, bool quiet) {
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return r;
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}
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bool journal_field_valid(const char *p, size_t l, bool allow_protected) {
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const char *a;
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/* We kinda enforce POSIX syntax recommendations for
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environment variables here, but make a couple of additional
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requirements.
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http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
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if (l == (size_t) -1)
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l = strlen(p);
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/* No empty field names */
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if (l <= 0)
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return false;
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/* Don't allow names longer than 64 chars */
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if (l > 64)
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return false;
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/* Variables starting with an underscore are protected */
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if (!allow_protected && p[0] == '_')
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return false;
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/* Don't allow digits as first character */
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if (p[0] >= '0' && p[0] <= '9')
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return false;
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/* Only allow A-Z0-9 and '_' */
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for (a = p; a < p + l; a++)
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if ((*a < 'A' || *a > 'Z') &&
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(*a < '0' || *a > '9') &&
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*a != '_')
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return false;
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return true;
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}
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@ -19,7 +19,10 @@
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***/
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#include <stdbool.h>
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#include <sys/types.h>
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#include "sd-journal.h"
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bool journal_field_valid(const char *p, size_t l, bool allow_protected);
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int journal_access_check_and_warn(sd_journal *j, bool quiet);
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