forked from pool/atftp
87 lines
2.9 KiB
Diff
87 lines
2.9 KiB
Diff
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Index: atftp-0.7/tftpd.c
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===================================================================
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--- atftp-0.7.orig/tftpd.c 2016-12-06 13:41:15.955496990 +0100
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+++ atftp-0.7/tftpd.c 2016-12-06 14:55:23.573139906 +0100
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@@ -95,8 +95,8 @@ int deny_severity = LOG_NOTICE;
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#endif
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/* user ID and group ID when running as a daemon */
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-char user_name[MAXLEN] = "nobody";
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-char group_name[MAXLEN] = "nogroup";
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+char user_name[MAXLEN] = "tftp";
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+char group_name[MAXLEN] = "tftp";
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/* For special uses, disable source port checking */
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int source_port_checking = 1;
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@@ -274,33 +274,47 @@ int main(int argc, char **argv)
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dup2(sockfd, 0);
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close(sockfd);
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- /* release priviliedge */
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- user = getpwnam(user_name);
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- group = getgrnam(group_name);
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- if (!user || !group)
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- {
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- logger(LOG_ERR,
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- "atftpd: can't change identity to %s.%s, exiting.",
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- user_name, group_name);
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- exit(1);
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- }
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+ }
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- /* write our pid in the specified file before changing user*/
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- if (pidfile)
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- {
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- if (tftpd_pid_file(pidfile, 1) != OK)
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- exit(1);
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- /* to be able to remove it later */
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- chown(pidfile, user->pw_uid, group->gr_gid);
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- }
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+ /* release privilege */
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+ user = getpwnam(user_name);
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+ group = getgrnam(group_name);
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+ if (!user || !group)
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+ {
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+ logger(LOG_ERR,
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+ "atftpd: can't change identity to %s.%s, exiting.",
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+ user_name, group_name);
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+ exit(1);
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+ }
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- setgid(group->gr_gid);
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- setuid(user->pw_uid);
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+ /* write our pid in the specified file before changing user*/
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+ if (pidfile)
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+ {
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+ if (tftpd_pid_file(pidfile, 1) != OK)
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+ exit(1);
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+ /* to be able to remove it later */
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+ chown(pidfile, user->pw_uid, group->gr_gid);
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+ }
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- /* Reopen log file now that we changed user, and that we've
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- * open and dup2 the socket. */
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- open_logger("atftpd", log_file, logging_level);
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+ if(setgid(group->gr_gid))
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+ {
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+ logger(LOG_ERR, "atftpd: can't switch group to %s, exiting.", group_name);
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+ exit(1);
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+ }
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+ if (setgroups(0, NULL))
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+ {
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+ logger(LOG_ERR, "atftpd: can't clear supplementary group list");
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+ exit(1);
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}
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+ if(setuid(user->pw_uid))
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+ {
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+ logger(LOG_ERR, "atftpd: can't switch user to %s, exiting.", user_name);
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+ exit(1);
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+ }
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+
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+ /* Reopen log file now that we changed user, and that we've
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+ * open and dup2 the socket. */
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+ open_logger("atftpd", log_file, logging_level);
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/* We need to retieve some information from incomming packets */
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if (setsockopt(0, SOL_IP, IP_PKTINFO, &one, sizeof(one)) != 0)
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