Initial revision

[gssapi-openssh.git] / openssh / ssh-keysign.c

diff --git a/openssh/ssh-keysign.c b/openssh/ssh-keysign.c
index 7f1d25d8c3f3ad944fa8531c0e4564ce19d15bc3..9e9ebe2f1717328db9c2d7ceaa6d5bd844e275be 100644 (file)
--- a/openssh/ssh-keysign.c
+++ b/openssh/ssh-keysign.c
@@ -22,12 +22,15 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include "includes.h"
-RCSID("$OpenBSD: ssh-keysign.c,v 1.4 2002/06/19 00:27:55 deraadt Exp $");
+RCSID("$OpenBSD: ssh-keysign.c,v 1.15 2004/01/19 21:25:15 markus Exp $");
 
 #include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/rsa.h>
 
 #include "log.h"
 #include "key.h"
+#include "ssh.h"
 #include "ssh2.h"
 #include "misc.h"
 #include "xmalloc.h"
@@ -37,6 +40,10 @@ RCSID("$OpenBSD: ssh-keysign.c,v 1.4 2002/06/19 00:27:55 deraadt Exp $");
 #include "msg.h"
 #include "canohost.h"
 #include "pathnames.h"
+#include "readconf.h"
+
+/* XXX readconf.c needs these */
+uid_t original_real_uid;
 
 #ifdef HAVE___PROGNAME
 extern char *__progname;
@@ -49,7 +56,7 @@ valid_request(struct passwd *pw, char *host, Key **ret, u_char *data,
     u_int datalen)
 {
        Buffer b;
-       Key *key;
+       Key *key = NULL;
        u_char *pkblob;
        u_int blen, len;
        char *pkalg, *p;
@@ -119,6 +126,7 @@ valid_request(struct passwd *pw, char *host, Key **ret, u_char *data,
        /* end of message */
        if (buffer_len(&b) != 0)
                fail++;
+       buffer_free(&b);
 
        debug3("valid_request: fail %d", fail);
 
@@ -134,12 +142,14 @@ int
 main(int argc, char **argv)
 {
        Buffer b;
+       Options options;
        Key *keys[2], *key;
        struct passwd *pw;
        int key_fd[2], i, found, version = 2, fd;
        u_char *signature, *data;
        char *host;
        u_int slen, dlen;
+       u_int32_t rnd[256];
 
        key_fd[0] = open(_PATH_HOST_RSA_KEY_FILE, O_RDONLY);
        key_fd[1] = open(_PATH_HOST_DSA_KEY_FILE, O_RDONLY);
@@ -155,6 +165,15 @@ main(int argc, char **argv)
        log_init("ssh-keysign", SYSLOG_LEVEL_DEBUG3, SYSLOG_FACILITY_AUTH, 0);
 #endif
 
+       /* verify that ssh-keysign is enabled by the admin */
+       original_real_uid = getuid();   /* XXX readconf.c needs this */
+       initialize_options(&options);
+       (void)read_config_file(_PATH_HOST_CONFIG_FILE, "", &options);
+       fill_default_options(&options);
+       if (options.enable_ssh_keysign != 1)
+               fatal("ssh-keysign not enabled in %s",
+                   _PATH_HOST_CONFIG_FILE);
+
        if (key_fd[0] == -1 && key_fd[1] == -1)
                fatal("could not open any host key");
 
@@ -163,6 +182,9 @@ main(int argc, char **argv)
        pw = pwcopy(pw);
 
        SSLeay_add_all_algorithms();
+       for (i = 0; i < 256; i++)
+               rnd[i] = arc4random();
+       RAND_seed(rnd, sizeof(rnd));
 
        found = 0;
        for (i = 0; i < 2; i++) {
@@ -179,8 +201,8 @@ main(int argc, char **argv)
                fatal("no hostkey found");
 
        buffer_init(&b);
-       if (msg_recv(STDIN_FILENO, &b) < 0)
-               fatal("msg_recv failed");
+       if (ssh_msg_recv(STDIN_FILENO, &b) < 0)
+               fatal("ssh_msg_recv failed");
        if (buffer_get_char(&b) != version)
                fatal("bad version");
        fd = buffer_get_int(&b);
@@ -192,7 +214,6 @@ main(int argc, char **argv)
        data = buffer_get_string(&b, &dlen);
        if (valid_request(pw, host, &key, data, dlen) < 0)
                fatal("not a valid request");
-       xfree(data);
        xfree(host);
 
        found = 0;
@@ -208,11 +229,13 @@ main(int argc, char **argv)
 
        if (key_sign(keys[i], &signature, &slen, data, dlen) != 0)
                fatal("key_sign failed");
+       xfree(data);
 
        /* send reply */
        buffer_clear(&b);
        buffer_put_string(&b, signature, slen);
-       msg_send(STDOUT_FILENO, version, &b);
+       if (ssh_msg_send(STDOUT_FILENO, version, &b) == -1)
+               fatal("ssh_msg_send failed");
 
        return (0);
 }