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annotate src/libident/id_query.c @ 331:e507c854a63e

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Security fix! Correct handling of seteuid() return value See Debian bug #638002, reported by John Lightsey. When possible the (already available) set_euidgid() function is used. Additionally, it is unnecessary to change the identity when writing into an already open file descriptor. This should fix the problem.
author markus schnalke <meillo@marmaro.de>
date Sat, 27 Aug 2011 16:19:07 +0200
parents 08114f7dcc23
children
rev   line source
meillo@0 1 /*
meillo@0 2 ** id_query.c Transmit a query to an IDENT server
meillo@0 3 **
meillo@0 4 ** Author: Peter Eriksson <pen@lysator.liu.se>
meillo@0 5 */
meillo@0 6
meillo@0 7 #ifdef NeXT3
meillo@0 8 # include <libc.h>
meillo@0 9 #endif
meillo@0 10
meillo@0 11 #include <stdio.h>
meillo@0 12 #include <errno.h>
meillo@0 13 #include <signal.h>
meillo@0 14
meillo@0 15 #ifdef HAVE_ANSIHEADERS
meillo@0 16 # include <stdlib.h>
meillo@0 17 # include <string.h>
meillo@0 18 # include <unistd.h>
meillo@0 19 #endif
meillo@0 20
meillo@0 21 #include <sys/types.h>
meillo@0 22 #include <sys/wait.h>
meillo@0 23 #include <sys/time.h>
meillo@0 24
meillo@0 25 #ifdef _AIX
meillo@0 26 # include <sys/select.h>
meillo@0 27 #endif
meillo@0 28
meillo@0 29 #ifdef _AIX
meillo@0 30 # include <sys/select.h>
meillo@0 31 #endif
meillo@0 32 #ifdef VMS
meillo@10 33 # include <sys/socket.h> /* for fd_set */
meillo@0 34 #endif
meillo@0 35 #define IN_LIBIDENT_SRC
meillo@0 36 #include "ident.h"
meillo@0 37
meillo@0 38
meillo@0 39 /*
meillo@10 40 int
meillo@10 41 id_query __P4(ident_t *, id, int, lport, int, fport, struct timeval *, timeout)
meillo@0 42 */
meillo@0 43
meillo@10 44 int
meillo@10 45 id_query __P((ident_t * id, int lport, int fport, __STRUCT_TIMEVAL_P timeout))
meillo@0 46 {
meillo@0 47 #ifdef SIGRETURNTYPE
meillo@10 48 SIGRETURNTYPE(*old_sig) ();
meillo@0 49 #else
meillo@10 50 void (*old_sig) __P((int));
meillo@0 51 #endif
meillo@10 52 int res;
meillo@10 53 char buf[80];
meillo@10 54 fd_set ws;
meillo@10 55
meillo@10 56 sprintf(buf, "%d , %d\r\n", lport, fport);
meillo@10 57
meillo@10 58 if (timeout) {
meillo@10 59 FD_ZERO(&ws);
meillo@10 60 FD_SET(id->fd, &ws);
meillo@0 61
meillo@0 62 #ifdef __hpux
meillo@10 63 if ((res = select(FD_SETSIZE, (int *) 0, (int *) &ws, (int *) 0, timeout)) < 0)
meillo@0 64 #else
meillo@10 65 if ((res = select(FD_SETSIZE, (fd_set *) 0, &ws, (fd_set *) 0, timeout)) < 0)
meillo@0 66 #endif
meillo@10 67 return -1;
meillo@10 68
meillo@10 69 if (res == 0) {
meillo@10 70 errno = ETIMEDOUT;
meillo@10 71 return -1;
meillo@10 72 }
meillo@0 73 }
meillo@0 74
meillo@10 75 old_sig = signal(SIGPIPE, SIG_IGN);
meillo@10 76
meillo@10 77 res = write(id->fd, buf, strlen(buf));
meillo@10 78
meillo@10 79 signal(SIGPIPE, old_sig);
meillo@10 80
meillo@10 81 return res;
meillo@0 82 }