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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.2

1.1       provos      1: /*
                      2:
                      3: auth-rh-rsa.c
                      4:
                      5: Author: Tatu Ylonen <ylo@cs.hut.fi>
                      6:
                      7: Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      8:                    All rights reserved
                      9:
                     10: Created: Sun May  7 03:08:06 1995 ylo
                     11:
                     12: Rhosts or /etc/hosts.equiv authentication combined with RSA host
                     13: authentication.
                     14:
                     15: */
                     16:
                     17: #include "includes.h"
1.2     ! provos     18: RCSID("$Id: auth-rh-rsa.c,v 1.1 1999/09/28 04:45:35 provos Exp $");
1.1       provos     19:
                     20: #include "packet.h"
                     21: #include "ssh.h"
                     22: #include "xmalloc.h"
                     23: #include "uidswap.h"
                     24:
                     25: /* Tries to authenticate the user using the .rhosts file and the host using
                     26:    its host key.  Returns true if authentication succeeds.
                     27:    .rhosts and .shosts will be ignored if ignore_rhosts is non-zero. */
                     28:
                     29: int auth_rhosts_rsa(struct passwd *pw, const char *client_user,
                     30:                    unsigned int client_host_key_bits,
                     31:                    BIGNUM *client_host_key_e, BIGNUM *client_host_key_n,
                     32:                    int ignore_rhosts, int strict_modes)
                     33: {
                     34:   const char *canonical_hostname;
1.2     ! provos     35:   HostStatus host_status;
        !            36:   BIGNUM *ke, *kn;
1.1       provos     37:
                     38:   debug("Trying rhosts with RSA host authentication for %.100s", client_user);
                     39:
                     40:   /* Check if we would accept it using rhosts authentication. */
                     41:   if (!auth_rhosts(pw, client_user, ignore_rhosts, strict_modes))
                     42:     return 0;
                     43:
                     44:   canonical_hostname = get_canonical_hostname();
                     45:
                     46:   debug("Rhosts RSA authentication: canonical host %.900s",
                     47:        canonical_hostname);
                     48:
                     49:   /* Check if we know the host and its host key. */
                     50:   /* Check system-wide host file. */
1.2     ! provos     51:   ke = BN_new();
        !            52:   kn = BN_new();
        !            53:   host_status = check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
        !            54:                                       client_host_key_bits, client_host_key_e,
        !            55:                                       client_host_key_n, ke, kn);
        !            56:   BN_free(ke);
        !            57:   BN_free(kn);
        !            58:   if (host_status != HOST_OK) {
        !            59:     /* The host key was not found. */
        !            60:     debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
        !            61:     packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
        !            62:     return 0;
        !            63:   }
        !            64:
1.1       provos     65:   /* A matching host key was found and is known. */
                     66:
                     67:   /* Perform the challenge-response dialog with the client for the host key. */
                     68:   if (!auth_rsa_challenge_dialog(client_host_key_bits,
                     69:                                 client_host_key_e, client_host_key_n))
                     70:     {
                     71:       log("Client on %.800s failed to respond correctly to host authentication.",
                     72:          canonical_hostname);
                     73:       return 0;
                     74:     }
                     75:
                     76:   /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and
                     77:      the host using RSA.  We accept the authentication. */
                     78:
                     79:   log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
                     80:       pw->pw_name, client_user, canonical_hostname);
                     81:   packet_send_debug("Rhosts with RSA host authentication accepted.");
                     82:   return 1;
                     83: }