FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_login.c

     /*
      * Copyright (c) 1999, Boris Popov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    This product includes software developed by Boris Popov.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #include <sys/param.h>
    #include <sys/errno.h>
    #include <sys/malloc.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/socket.h>
    
    #include <netncp/ncp.h>
    #include <netncp/ncp_conn.h>
    #include <netncp/ncp_subr.h>
    #include <netncp/ncp_ncp.h>
    #include <netncp/ncp_rq.h>
    #include <netncp/ncp_nls.h>
    #include <netncp/nwerror.h>
    
    static int  ncp_login_encrypted(struct ncp_conn *conn, struct ncp_bindery_object *object,
                        unsigned char *key, unsigned char *passwd,
                        struct proc *p, struct ucred *cred);
    static int ncp_login_unencrypted(struct ncp_conn *conn, u_int16_t object_type, 
                        char *object_name, unsigned char *passwd,
                        struct proc *p, struct ucred *cred);
    static int  ncp_sign_start(struct ncp_conn *conn, char *logindata);
    static int  ncp_get_encryption_key(struct ncp_conn *conn, char *target);
    
    /*
     * Initialize packet signatures. They a slightly modified MD4.
     * The first 16 bytes of logindata are the shuffled password,
     * the last 8 bytes the encryption key as received from the server.
     */
    int
    ncp_sign_start(struct ncp_conn *conn, char *logindata) {
            char msg[64];
            u_int32_t state[4];
    
            memcpy(msg, logindata, 24);
            memcpy(msg + 24, "Authorized NetWare Client", 25);
            bzero(msg + 24 + 25, sizeof(msg) - 24 - 25);
    
            conn->sign_state[0] = 0x67452301;
            conn->sign_state[1] = 0xefcdab89;
            conn->sign_state[2] = 0x98badcfe;
            conn->sign_state[3] = 0x10325476;
            ncp_sign(conn->sign_state, msg, state);
            conn->sign_root[0] = state[0];
            conn->sign_root[1] = state[1];
            conn->flags |= NCPFL_SIGNACTIVE;
            return 0;
    }
    
    /*
     * target is a 8-byte buffer
     */
    int
    ncp_get_encryption_key(struct ncp_conn *conn, char *target) {
            int error;
            DECLARE_RQ;
    
            NCP_RQ_HEAD_S(23,23,conn->procp,conn->ucred);
            checkbad(ncp_request(conn,rqp));
            if (rqp->rpsize < 8) {
                    NCPFATAL("rpsize=%d < 8\n", rqp->rpsize);
                    return EIO;
            }
            ncp_rp_mem(rqp, target, 8);
            NCP_RQ_EXIT;
            return error;
   }
   
   int
   ncp_login_object(struct ncp_conn *conn, unsigned char *username, 
                   int login_type, unsigned char *password,
                   struct proc *p,struct ucred *cred)
   {
           int error;
           unsigned char ncp_key[8];
           struct ncp_bindery_object user;
   
           if ((error = ncp_get_encryption_key(conn, ncp_key)) != 0) {
                   printf("%s: Warning: use unencrypted login\n", __FUNCTION__);
                   return ncp_login_unencrypted(conn, login_type, username, password,p,cred);
           }
           if ((error = ncp_get_bindery_object_id(conn, login_type, username, &user,p,cred)) != 0) {
                   return error;
           }
           error = ncp_login_encrypted(conn, &user, ncp_key, password,p,cred);
           return error;
   }
   
   int
   ncp_login_encrypted(struct ncp_conn *conn, struct ncp_bindery_object *object,
                       unsigned char *key, unsigned char *passwd,
                       struct proc *p,struct ucred *cred) {
           u_int32_t tmpID = htonl(object->object_id);
           u_char buf[16 + 8];
           u_char encrypted[8];
           int error;
           DECLARE_RQ;
   
           nw_keyhash((u_char*)&tmpID, passwd, strlen(passwd), buf);
           nw_encrypt(key, buf, encrypted);
   
           NCP_RQ_HEAD_S(23,24,p,cred);
           ncp_rq_mem(rqp, encrypted, 8);
           ncp_rq_word_hl(rqp, object->object_type);
           ncp_rq_pstring(rqp, object->object_name);
           error = ncp_request(conn, rqp);
           NCP_RQ_EXIT_NB;
           if (conn->flags & NCPFL_SIGNWANTED) {
                   if (error == 0 || error == NWE_PASSWORD_EXPIRED) {
                           memcpy(buf + 16, key, 8);
                           error = ncp_sign_start(conn, buf);
                   }
           }
           return error;
   }
   
   int
   ncp_login_unencrypted(struct ncp_conn *conn, u_int16_t object_type, 
                       char *object_name, unsigned char *passwd,
                       struct proc *p, struct ucred *cred)
   {
           int error;
           DECLARE_RQ;
   
           NCP_RQ_HEAD_S(23,20,conn->procp,conn->ucred);
           ncp_rq_word_hl(rqp, object_type);
           ncp_rq_pstring(rqp, object_name);
           ncp_rq_pstring(rqp, passwd);
           error = ncp_request(conn,rqp);
           NCP_RQ_EXIT_NB;
           return error;
   }
   
   /*
    * Login to specified server with username and password.
    * conn should be locked.
    */
   int
   ncp_login(struct ncp_conn *conn, char *user, int objtype, char *password,
             struct proc *p, struct ucred *cred) {
           int error;
   
           if (ncp_suser(cred) != 0 && cred->cr_uid != conn->nc_owner->cr_uid)
                   return EACCES;
           if (conn->flags & NCPFL_LOGGED) return EALREADY;
           if ((conn->flags & NCPFL_ATTACHED) == 0) return ENOTCONN;
           conn->li.user = ncp_str_dup(user);
           conn->li.password = ncp_str_dup(password);
           if (conn->li.user == NULL || conn->li.password == NULL) {
                   error = EINVAL;
                   goto bad;
           }
           ncp_str_upper(conn->li.user);
           if ((conn->li.opt & NCP_OPT_NOUPCASEPASS) == 0)
                   ncp_str_upper(conn->li.password);
           checkbad(ncp_login_object(conn, conn->li.user, objtype, conn->li.password,p,cred));
           conn->li.objtype = objtype;
           conn->flags |= NCPFL_LOGGED;
           return 0;
   bad:
           if (conn->li.user) free(conn->li.user, M_NCPDATA);
           if (conn->li.password) free(conn->li.password, M_NCPDATA);
           conn->li.user = conn->li.password = NULL;
           return error;
   }

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