- (djm) [ssh-rand-helper.c] Needs a bunch of headers

[openssh.git] / ssh-agent.c

diff --git a/ssh-agent.c b/ssh-agent.c
index d595479f9984c480bb359ae9059b18e380fa2fae..b45087629cfe646d4ad828ea357c84bfd47f829c 100644 (file)
--- a/ssh-agent.c
+++ b/ssh-agent.c
@@ -34,8 +34,18 @@
  */
 
 #include "includes.h"
+RCSID("$OpenBSD: ssh-agent.c,v 1.129 2006/02/20 17:02:44 stevesk Exp $");
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_UN_H
+# include <sys/un.h>
+#endif
 #include "openbsd-compat/sys-queue.h"
-RCSID("$OpenBSD: ssh-agent.c,v 1.115 2003/10/14 19:54:39 markus Exp $");
+#include <sys/resource.h>
+#ifdef HAVE_PATHS_H
+# include <paths.h>
+#endif
+#include <signal.h>
 
 #include <openssl/evp.h>
 #include <openssl/md5.h>
@@ -50,13 +60,16 @@ RCSID("$OpenBSD: ssh-agent.c,v 1.115 2003/10/14 19:54:39 markus Exp $");
 #include "authfd.h"
 #include "compat.h"
 #include "log.h"
-#include "readpass.h"
 #include "misc.h"
 
 #ifdef SMARTCARD
 #include "scard.h"
 #endif
 
+#if defined(HAVE_SYS_PRCTL_H)
+#include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */
+#endif
+
 typedef enum {
        AUTH_UNUSED,
        AUTH_SOCKET,
@@ -103,11 +116,7 @@ char socket_dir[1024];
 int locked = 0;
 char *lock_passwd = NULL;
 
-#ifdef HAVE___PROGNAME
 extern char *__progname;
-#else
-char *__progname;
-#endif
 
 /* Default lifetime (0 == forever) */
 static int lifetime = 0;
@@ -169,23 +178,15 @@ lookup_identity(Key *key, int version)
 static int
 confirm_key(Identity *id)
 {
-       char *p, prompt[1024];
+       char *p;
        int ret = -1;
 
        p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
-       snprintf(prompt, sizeof(prompt), "Allow use of key %s?\n"
-           "Key fingerprint %s.", id->comment, p);
+       if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
+           id->comment, p))
+               ret = 0;
        xfree(p);
-       p = read_passphrase(prompt, RP_ALLOW_EOF);
-       if (p != NULL) {
-               /*
-                * Accept empty responses and responses consisting 
-                * of the word "yes" as affirmative.
-                */
-               if (*p == '\0' || *p == '\n' || strcasecmp(p, "yes") == 0)
-                       ret = 0;
-               xfree(p);
-       }
+
        return (ret);
 }
 
@@ -364,7 +365,7 @@ process_remove_identity(SocketEntry *e, int version)
                if (id != NULL) {
                        /*
                         * We have this key.  Free the old key.  Since we
-                        * don\'t want to leave empty slots in the middle of
+                        * don't want to leave empty slots in the middle of
                         * the array, we actually free the key there and move
                         * all the entries between the empty slot and the end
                         * of the array.
@@ -786,8 +787,7 @@ new_socket(sock_type type, int fd)
 {
        u_int i, old_alloc, new_alloc;
 
-       if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
-               error("fcntl O_NONBLOCK: %s", strerror(errno));
+       set_nonblock(fd);
 
        if (fd > max_fd)
                max_fd = fd;
@@ -818,7 +818,7 @@ new_socket(sock_type type, int fd)
 }
 
 static int
-prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, int *nallocp)
+prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
 {
        u_int i, sz;
        int n = 0;
@@ -1004,25 +1004,32 @@ int
 main(int ac, char **av)
 {
        int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
-       int sock, fd,  ch, nalloc;
+       int sock, fd,  ch;
+       u_int nalloc;
        char *shell, *format, *pidstr, *agentsocket = NULL;
        fd_set *readsetp = NULL, *writesetp = NULL;
        struct sockaddr_un sunaddr;
 #ifdef HAVE_SETRLIMIT
        struct rlimit rlim;
 #endif
-#ifdef HAVE_CYGWIN
        int prev_mask;
-#endif
        extern int optind;
        extern char *optarg;
        pid_t pid;
        char pidstrbuf[1 + 3 * sizeof pid];
 
+       /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
+       sanitise_stdfd();
+
        /* drop */
        setegid(getgid());
        setgid(getgid());
 
+#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
+       /* Disable ptrace on Linux without sgid bit */
+       prctl(PR_SET_DUMPABLE, 0);
+#endif
+
        SSLeay_add_all_algorithms();
 
        __progname = ssh_get_progname(av[0]);
@@ -1120,25 +1127,21 @@ main(int ac, char **av)
        sock = socket(AF_UNIX, SOCK_STREAM, 0);
        if (sock < 0) {
                perror("socket");
+               *socket_name = '\0'; /* Don't unlink any existing file */
                cleanup_exit(1);
        }
        memset(&sunaddr, 0, sizeof(sunaddr));
        sunaddr.sun_family = AF_UNIX;
        strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
-#ifdef HAVE_CYGWIN
        prev_mask = umask(0177);
-#endif
        if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
                perror("bind");
-#ifdef HAVE_CYGWIN
+               *socket_name = '\0'; /* Don't unlink any existing file */
                umask(prev_mask);
-#endif
                cleanup_exit(1);
        }
-#ifdef HAVE_CYGWIN
        umask(prev_mask);
-#endif
-       if (listen(sock, 128) < 0) {
+       if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
                perror("listen");
                cleanup_exit(1);
        }