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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.1

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"
        !            18: RCSID("$Id: auth-rh-rsa.c,v 1.3 1999/05/04 11:58:23 bg Exp $");
        !            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;
        !            35:
        !            36:   debug("Trying rhosts with RSA host authentication for %.100s", client_user);
        !            37:
        !            38:   /* Check if we would accept it using rhosts authentication. */
        !            39:   if (!auth_rhosts(pw, client_user, ignore_rhosts, strict_modes))
        !            40:     return 0;
        !            41:
        !            42:   canonical_hostname = get_canonical_hostname();
        !            43:
        !            44:   debug("Rhosts RSA authentication: canonical host %.900s",
        !            45:        canonical_hostname);
        !            46:
        !            47:   /* Check if we know the host and its host key. */
        !            48:   /* Check system-wide host file. */
        !            49:   if (check_host_in_hostfile(SSH_SYSTEM_HOSTFILE, canonical_hostname,
        !            50:                             client_host_key_bits, client_host_key_e,
        !            51:                             client_host_key_n) != HOST_OK)
        !            52:     {
        !            53:       /* The host key was not found. */
        !            54:       debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
        !            55:       packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
        !            56:       return 0;
        !            57:     }
        !            58:   /* A matching host key was found and is known. */
        !            59:
        !            60:   /* Perform the challenge-response dialog with the client for the host key. */
        !            61:   if (!auth_rsa_challenge_dialog(client_host_key_bits,
        !            62:                                 client_host_key_e, client_host_key_n))
        !            63:     {
        !            64:       log("Client on %.800s failed to respond correctly to host authentication.",
        !            65:          canonical_hostname);
        !            66:       return 0;
        !            67:     }
        !            68:
        !            69:   /* We have authenticated the user using .rhosts or /etc/hosts.equiv, and
        !            70:      the host using RSA.  We accept the authentication. */
        !            71:
        !            72:   log("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
        !            73:       pw->pw_name, client_user, canonical_hostname);
        !            74:   packet_send_debug("Rhosts with RSA host authentication accepted.");
        !            75:   return 1;
        !            76: }