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8de3884106
It was: - setting the euid from the real groupid (yow!) - not recovering it's setuid permissions when cleaning the utmp file. I've left in some diagnostic code for "shouldn't happen" cases.
191 lines
3.8 KiB
Plaintext
191 lines
3.8 KiB
Plaintext
# The following is a security patch for rxvt, it (hopefully) avoids problems
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# with unauthorized users obtaining root.
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#
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# Based upon code provided by Marc Ewing (marc@redhat.com) for a previous
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# version of rxvt.
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#
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# BSD utmp code fixed again by peter@freebsd.org
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*** rxvt.h Sat Feb 19 09:41:52 1994
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--- rxvt.h Wed Jan 10 23:42:09 1996
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***************
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*** 21,23 ****
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--- 21,27 ----
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extern void clean_exit(int);
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extern void cleanutent(void);
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extern void makeutent(char *);
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+
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+ void save_privs(void);
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+ void get_privs(void);
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+ void release_privs(void);
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*** rxvt.c Fri Aug 5 23:52:07 1994
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--- rxvt.c Sat Feb 24 22:03:27 1996
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***************
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*** 45,50 ****
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--- 45,54 ----
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int i;
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char *shell;
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char **com_argv;
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+
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+ /* Save and give up setuid/setgid privileges */
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+ save_privs();
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+ release_privs();
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for (i = 0; i < argc; i++)
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if (strcmp(argv[i],"-e") == 0)
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*** command.c Sat Feb 24 22:03:27 1996
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--- command.c Sat Feb 24 22:12:26 1996
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***************
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*** 222,227 ****
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--- 222,251 ----
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}
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#endif
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+ static uid_t saved_uid;
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+ static gid_t saved_gid;
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+
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+ void save_privs()
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+ {
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+ saved_uid = geteuid();
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+ saved_gid = getegid();
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+ }
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+
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+ void get_privs()
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+ {
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+ if (seteuid(saved_uid) < 0)
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+ perror("failed to restore saved uid");
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+ if (setegid(saved_gid) < 0)
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+ perror("failed to restore saved gid");
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+ }
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+
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+ void release_privs()
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+ {
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+ if (seteuid(getuid()) < 0)
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+ perror("failed to release setuid");
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+ if (setegid(getgid()) < 0)
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+ perror("failed to release setgid");
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+ }
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/* Catch a SIGCHLD signal and exit if the direct child has died.
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*/
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***************
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*** 337,344 ****
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--- 361,370 ----
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gid = gr->gr_gid;
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else
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gid = -1;
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+ get_privs();
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fchown(ttyfd,uid,gid);
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fchmod(ttyfd,0600);
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+ release_privs();
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#endif
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#ifdef TIOCCONS
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if (console)
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*** utmp.c Tue Oct 4 08:47:56 1994
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--- utmp.c Sat Feb 24 22:21:30 1996
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***************
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*** 71,79 ****
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extern char ttynam[];
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extern struct stat ttyfd_stat;
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! chmod(ttynam,ttyfd_stat.st_mode);
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!
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! chown(ttynam,ttyfd_stat.st_uid,ttyfd_stat.st_gid);
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#endif
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if(madeutent)
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cleanutent();
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--- 71,83 ----
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extern char ttynam[];
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extern struct stat ttyfd_stat;
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! get_privs();
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! if (chmod(ttynam,ttyfd_stat.st_mode) < 0)
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! perror("cant reset tty modes");
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!
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! if (chown(ttynam,ttyfd_stat.st_uid,ttyfd_stat.st_gid) < 0)
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! perror("cant reset tty owner");
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! release_privs();
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#endif
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if(madeutent)
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cleanutent();
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***************
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*** 166,171 ****
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--- 170,176 ----
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{
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FILE *utmp;
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+ get_privs();
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if((utmp = fopen(UTMP,"r+")) == NULL)
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return -1;
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utmp_pos = get_tslot(ttyname) * sizeof(struct utmp);
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***************
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*** 174,179 ****
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--- 179,185 ----
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fseek(utmp,utmp_pos,0);
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fwrite((char *)u, sizeof(struct utmp),1,utmp);
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fclose(utmp);
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+ release_privs();
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madeutent = 1;
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return(utmp_pos);
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}
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***************
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*** 228,239 ****
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--- 234,247 ----
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FILE *ut;
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struct utmp u;
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+ get_privs();
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if((ut = fopen(UTMP,"r+")) == NULL)
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return;
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fseek(ut,utmp_pos,0);
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memset(&u,0,sizeof(u));
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fwrite((char *)&u,sizeof(struct utmp),1,ut);
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fclose(ut);
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+ release_privs();
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}
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***************
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*** 250,259 ****
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--- 258,269 ----
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int write_utmp(struct utmp * u)
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{
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int pos;
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+ get_privs();
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utmpname(UTMP);
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setutent();
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pututline(u);
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endutent();
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+ release_privs();
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pos = (int)NULL;
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madeutent = 1;
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return(pos);
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***************
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*** 305,311 ****
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{
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int pid;
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struct utmp *u;
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!
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utmpname(UTMP);
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setutent();
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pid = getpid();
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--- 315,322 ----
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{
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int pid;
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struct utmp *u;
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!
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! get_privs();
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utmpname(UTMP);
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setutent();
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pid = getpid();
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***************
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*** 333,338 ****
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--- 344,350 ----
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endutent();
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}
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}
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+ release_privs();
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}
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#endif /* BSD */
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