/*
 * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

/* UNIX SMBlib NetBIOS implementation

   Version 1.0
   SMBlib Routines

   Copyright (C) Richard Sharpe 1996
*/

/*
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "squid.h"

int SMBlib_errno;
int SMBlib_SMB_Error;
#define SMBLIB_ERRNO

#include "rfcnb/rfcnb.h"
#include "smblib/smblib-priv.h"
#include "smblib/smblib.h"

#include <signal.h>
#if HAVE_STRING_H
#include <string.h>
#endif

SMB_State_Types SMBlib_State;

const char *SMB_Prots[] = {"PC NETWORK PROGRAM 1.0",
                           "MICROSOFT NETWORKS 1.03",
                           "MICROSOFT NETWORKS 3.0",
                           "DOS LANMAN1.0",
                           "LANMAN1.0",
                           "DOS LM1.2X002",
                           "LM1.2X002",
                           "DOS LANMAN2.1",
                           "LANMAN2.1",
                           "Samba",
                           "NT LM 0.12",
                           "NT LANMAN 1.0",
                           NULL
                          };

/* Initialize the SMBlib package     */

int SMB_Init()

{

    SMBlib_State = SMB_State_Started;

    signal(SIGPIPE, SIG_IGN);   /* Ignore these ... */

    /* If SMBLIB_Instrument is defines, turn on the instrumentation stuff */
#ifdef SMBLIB_INSTRUMENT

    SMBlib_Instrument_Init();

#endif

    return 0;

}

/* SMB_Create: Create a connection structure and return for later use */
/* We have other helper routines to set variables                     */

SMB_Handle_Type SMB_Create_Con_Handle()

{

    SMBlib_errno = SMBlibE_NotImpl;
    return(NULL);

}

/* SMB_Connect_Server: Connect to a server, but don't negotiate protocol */
/* or anything else ...                                                  */

SMB_Handle_Type SMB_Connect_Server(SMB_Handle_Type Con_Handle,
                                   const char *server, const char *NTdomain)

{
    SMB_Handle_Type con;
    char called[80], calling[80], *address;
    int i;

    /* Get a connection structure if one does not exist */

    con = Con_Handle;

    if (Con_Handle == NULL) {

        if ((con = (struct SMB_Connect_Def *)malloc(sizeof(struct SMB_Connect_Def))) == NULL) {

            SMBlib_errno = SMBlibE_NoSpace;
            return NULL;
        }

    }

    /* Init some things ... */

    strcpy(con -> service, "");
    strcpy(con -> username, "");
    strcpy(con -> password, "");
    strcpy(con -> sock_options, "");
    strcpy(con -> address, "");
    strncpy(con -> desthost, server, sizeof(con->desthost));
    con->desthost[sizeof(con->desthost) - 1] = '\0';
    strncpy(con -> PDomain, NTdomain, sizeof(con->PDomain));
    con->PDomain[sizeof(con->PDomain) - 1] = '\0';
    strcpy(con -> OSName, SMBLIB_DEFAULT_OSNAME);
    strcpy(con -> LMType, SMBLIB_DEFAULT_LMTYPE);
    con -> first_tree = con -> last_tree = NULL;

    SMB_Get_My_Name(con -> myname, sizeof(con -> myname));

    con -> port = 0;                    /* No port selected */

    /* Get some things we need for the SMB Header */

    con -> pid = getpid();
    con -> mid = con -> pid;      /* This will do for now ... */
    con -> uid = 0;               /* Until we have done a logon, no uid ... */
    con -> gid = getgid();

    /* Now connect to the remote end, but first upper case the name of the
       service we are going to call, sine some servers want it in uppercase */

    for (i=0; i < strlen(server); i++)
        called[i] = xtoupper(server[i]);

    called[strlen(server)] = 0;    /* Make it a string */

    for (i=0; i < strlen(con -> myname); i++)
        calling[i] = xtoupper(con -> myname[i]);

    calling[strlen(con -> myname)] = 0;    /* Make it a string */

    if (strlen(con -> address) == 0)
        address = con -> desthost;
    else
        address = con -> address;

    con -> Trans_Connect = RFCNB_Call(called,
                                      calling,
                                      address, /* Protocol specific */
                                      con -> port);

    /* Did we get one? */

    if (con -> Trans_Connect == NULL) {

        if (Con_Handle == NULL) {
            Con_Handle = NULL;
            free(con);
        }
        SMBlib_errno = -SMBlibE_CallFailed;
        return NULL;

    }

    return(con);

}

/* SMB_Connect: Connect to the indicated server                       */
/* If Con_Handle == NULL then create a handle and connect, otherwise  */
/* use the handle passed                                              */

const char *SMB_Prots_Restrict[] = {"PC NETWORK PROGRAM 1.0",
                                    NULL
                                   };

SMB_Handle_Type SMB_Connect(SMB_Handle_Type Con_Handle,
                            SMB_Tree_Handle *tree,
                            char *service,
                            char *username,
                            char *password)

{
    SMB_Handle_Type con;
    char *host, *address;
    char temp[80], called[80], calling[80];
    int i;

    /* Get a connection structure if one does not exist */

    con = Con_Handle;

    if (Con_Handle == NULL) {

        if ((con = (struct SMB_Connect_Def *)malloc(sizeof(struct SMB_Connect_Def))) == NULL) {

            SMBlib_errno = SMBlibE_NoSpace;
            return NULL;
        }

    }

    /* Init some things ... */

    strncpy(con -> service, service, sizeof(con -> service));
    con -> service[sizeof(con -> service) - 1] = '\0';
    strncpy(con -> username, username, sizeof(con -> username));
    con -> username[sizeof(con -> username) - 1] = '\0';
    strncpy(con -> password, password, sizeof(con -> password));
    con -> password[sizeof(con -> password) - 1] = '\0';
    strcpy(con -> sock_options, "");
    strcpy(con -> address, "");
    strcpy(con -> PDomain, SMBLIB_DEFAULT_DOMAIN);
    strcpy(con -> OSName, SMBLIB_DEFAULT_OSNAME);
    strcpy(con -> LMType, SMBLIB_DEFAULT_LMTYPE);
    con -> first_tree = con -> last_tree = NULL;

    SMB_Get_My_Name(con -> myname, sizeof(con -> myname));

    con -> port = 0;                    /* No port selected */

    /* Get some things we need for the SMB Header */

    con -> pid = getpid();
    con -> mid = con -> pid;      /* This will do for now ... */
    con -> uid = 0;               /* Until we have done a logon, no uid */
    con -> gid = getgid();

    /* Now figure out the host portion of the service */

    strncpy(temp, service, sizeof(temp));
    temp[sizeof(temp) - 1] = '\0';
    host = strtok(temp, "/\\");     /* Separate host name portion */
    if (!host) {
        if (Con_Handle == NULL) {
            free(con);
            Con_Handle = NULL;
        }
        SMBlib_errno = -SMBlibE_CallFailed;
        return NULL;
    }
    strncpy(con->desthost, host, sizeof(con->desthost));
    con->desthost[sizeof(con->desthost)-1]='\0';

    /* Now connect to the remote end, but first upper case the name of the
       service we are going to call, sine some servers want it in uppercase */

    for (i=0; i < strlen(host); i++)
        called[i] = xtoupper(host[i]);

    called[strlen(host)] = 0;    /* Make it a string */

    for (i=0; i < strlen(con -> myname); i++)
        calling[i] = xtoupper(con -> myname[i]);

    calling[strlen(con -> myname)] = 0;    /* Make it a string */

    if (strlen(con -> address) == 0)
        address = con -> desthost;
    else
        address = con -> address;

    con -> Trans_Connect = RFCNB_Call(called,
                                      calling,
                                      address, /* Protocol specific */
                                      con -> port);

    /* Did we get one? */

    if (con -> Trans_Connect == NULL) {

        if (Con_Handle == NULL) {
            free(con);
            Con_Handle = NULL;
        }
        SMBlib_errno = -SMBlibE_CallFailed;
        return NULL;

    }

    /* Now, negotiate the protocol */

    if (SMB_Negotiate(con, SMB_Prots_Restrict) < 0) {

        if (Con_Handle == NULL) {
            free(con);
        }
        SMBlib_errno = -SMBlibE_NegNoProt;
        return NULL;

    }

    /* Now connect to the service ... */

    if ((*tree = SMB_TreeConnect(con, NULL, service, password, "A:")) == NULL) {

        if (Con_Handle == NULL) {
            free(con);
        }
        SMBlib_errno = -SMBlibE_BAD;
        return NULL;

    }

    return(con);

}

/* Logon to the server. That is, do a session setup if we can. We do not do */
/* Unicode yet!                                                             */

int SMB_Logon_Server(SMB_Handle_Type Con_Handle, char *UserName,
                     char *PassWord, const char *NtDomain, int PreCrypted)

{
    struct RFCNB_Pkt *pkt;
    int param_len, pkt_len, pass_len;
    char *p, pword[128];

    /* First we need a packet etc ... but we need to know what protocol has  */
    /* been negotiated to figure out if we can do it and what SMB format to  */
    /* use ...                                                               */

    if (Con_Handle -> protocol < SMB_P_LanMan1) {

        SMBlib_errno = SMBlibE_ProtLow;
        return(SMBlibE_BAD);

    }

    if (PreCrypted) {
        pass_len = 24;
        memcpy(pword, PassWord, 24);
    } else {
        strncpy(pword, PassWord, sizeof(pword));
        pword[sizeof(pword) - 1] = '\0';
#ifdef PAM_SMB_ENC_PASS
        if (Con_Handle->encrypt_passwords) {
            pass_len = 24;
            SMBencrypt((uchar *) PassWord, (uchar *) Con_Handle->Encrypt_Key, (uchar *) pword);
        } else
#endif
            pass_len = strlen(pword);
    }

    /* Now build the correct structure */

    if (Con_Handle -> protocol < SMB_P_NT1) {

        /* We don't handle encrypted passwords ... */

        param_len = strlen(UserName) + 1 + pass_len + 1 +
                    (NtDomain!=NULL ? strlen(NtDomain) : strlen(Con_Handle->PDomain)) + 1 +
                    strlen(Con_Handle -> OSName) + 1;

        pkt_len = SMB_ssetpLM_len + param_len;

        pkt = (struct RFCNB_Pkt *)RFCNB_Alloc_Pkt(pkt_len);

        if (pkt == NULL) {

            SMBlib_errno = SMBlibE_NoSpace;
            return(SMBlibE_BAD); /* Should handle the error */

        }

        memset(SMB_Hdr(pkt), 0, SMB_ssetpLM_len);
        SIVAL(SMB_Hdr(pkt), SMB_hdr_idf_offset, SMB_DEF_IDF);  /* Plunk in IDF */
        *(SMB_Hdr(pkt) + SMB_hdr_com_offset) = SMBsesssetupX;
        SSVAL(SMB_Hdr(pkt), SMB_hdr_pid_offset, Con_Handle -> pid);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_tid_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_mid_offset, Con_Handle -> mid);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_uid_offset, Con_Handle -> uid);
        *(SMB_Hdr(pkt) + SMB_hdr_wct_offset) = 10;
        *(SMB_Hdr(pkt) + SMB_hdr_axc_offset) = 0xFF;    /* No extra command */
        SSVAL(SMB_Hdr(pkt), SMB_hdr_axo_offset, 0);

        SSVAL(SMB_Hdr(pkt), SMB_ssetpLM_mbs_offset, SMBLIB_MAX_XMIT);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpLM_mmc_offset, 2);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpLM_vcn_offset, Con_Handle -> pid);
        SIVAL(SMB_Hdr(pkt), SMB_ssetpLM_snk_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpLM_pwl_offset, pass_len + 1);
        SIVAL(SMB_Hdr(pkt), SMB_ssetpLM_res_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpLM_bcc_offset, param_len);

        /* Now copy the param strings in with the right stuff */

        p = (char *)(SMB_Hdr(pkt) + SMB_ssetpLM_buf_offset);

        /* Copy  in password, then the rest. Password has a null at end */

        memcpy(p, pword, pass_len);

        p = p + pass_len + 1;

        strcpy(p, UserName);
        p = p + strlen(UserName);
        *p = 0;

        p = p + 1;

        if (NtDomain == NULL) {
            strcpy(p, Con_Handle -> PDomain);
            p = p + strlen(Con_Handle -> PDomain);
        } else {
            strcpy(p, NtDomain);
            p = p + strlen(NtDomain);
        }
        *p = 0;
        p = p + 1;

        strcpy(p, Con_Handle -> OSName);
        p = p + strlen(Con_Handle -> OSName);
        *p = 0;

    } else {

        /* We don't admit to UNICODE support ... */

        param_len = strlen(UserName) + 1 + pass_len +
                    strlen(Con_Handle -> PDomain) + 1 +
                    strlen(Con_Handle -> OSName) + 1 +
                    strlen(Con_Handle -> LMType) + 1;

        pkt_len = SMB_ssetpNTLM_len + param_len;

        pkt = (struct RFCNB_Pkt *)RFCNB_Alloc_Pkt(pkt_len);

        if (pkt == NULL) {

            SMBlib_errno = SMBlibE_NoSpace;
            return(-1); /* Should handle the error */

        }

        memset(SMB_Hdr(pkt), 0, SMB_ssetpNTLM_len);
        SIVAL(SMB_Hdr(pkt), SMB_hdr_idf_offset, SMB_DEF_IDF);  /* Plunk in IDF */
        *(SMB_Hdr(pkt) + SMB_hdr_com_offset) = SMBsesssetupX;
        SSVAL(SMB_Hdr(pkt), SMB_hdr_pid_offset, Con_Handle -> pid);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_tid_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_mid_offset, Con_Handle -> mid);
        SSVAL(SMB_Hdr(pkt), SMB_hdr_uid_offset, Con_Handle -> uid);
        *(SMB_Hdr(pkt) + SMB_hdr_wct_offset) = 13;
        *(SMB_Hdr(pkt) + SMB_hdr_axc_offset) = 0xFF;    /* No extra command */
        SSVAL(SMB_Hdr(pkt), SMB_hdr_axo_offset, 0);

        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_mbs_offset, SMBLIB_MAX_XMIT);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_mmc_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_vcn_offset, 1); /* Thanks Tridge! */
        SIVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_snk_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_cipl_offset, pass_len);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_cspl_offset, 0);
        SIVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_res_offset, 0);
        SIVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_cap_offset, 0);
        SSVAL(SMB_Hdr(pkt), SMB_ssetpNTLM_bcc_offset, param_len);

        /* Now copy the param strings in with the right stuff */

        p = (char *)(SMB_Hdr(pkt) + SMB_ssetpNTLM_buf_offset);

        /* Copy  in password, then the rest. Password has no null at end */

        memcpy(p, pword, pass_len);

        p = p + pass_len;

        strcpy(p, UserName);
        p = p + strlen(UserName);
        *p = 0;

        p = p + 1;

        strcpy(p, Con_Handle -> PDomain);
        p = p + strlen(Con_Handle -> PDomain);
        *p = 0;
        p = p + 1;

        strcpy(p, Con_Handle -> OSName);
        p = p + strlen(Con_Handle -> OSName);
        *p = 0;
        p = p + 1;

        strcpy(p, Con_Handle -> LMType);
        p = p + strlen(Con_Handle -> LMType);
        *p = 0;

    }

    /* Now send it and get a response */

    if (RFCNB_Send(Con_Handle -> Trans_Connect, pkt, pkt_len) < 0) {

#ifdef DEBUG
        fprintf(stderr, "Error sending SessSetupX request\n");
#endif

        RFCNB_Free_Pkt(pkt);
        SMBlib_errno = SMBlibE_SendFailed;
        return(SMBlibE_BAD);

    }

    /* Now get the response ... */

    if (RFCNB_Recv(Con_Handle -> Trans_Connect, pkt, pkt_len) < 0) {

#ifdef DEBUG
        fprintf(stderr, "Error receiving response to SessSetupAndX\n");
#endif

        RFCNB_Free_Pkt(pkt);
        SMBlib_errno = SMBlibE_RecvFailed;
        return(SMBlibE_BAD);

    }

    /* Check out the response type ... */

    if (CVAL(SMB_Hdr(pkt), SMB_hdr_rcls_offset) != SMBC_SUCCESS) {  /* Process error */

#ifdef DEBUG
        fprintf(stderr, "SMB_SessSetupAndX failed with errorclass = %i, Error Code = %i\n",
                CVAL(SMB_Hdr(pkt), SMB_hdr_rcls_offset),
                SVAL(SMB_Hdr(pkt), SMB_hdr_err_offset));
#endif

        SMBlib_SMB_Error = IVAL(SMB_Hdr(pkt), SMB_hdr_rcls_offset);
        RFCNB_Free_Pkt(pkt);
        SMBlib_errno = SMBlibE_Remote;
        return(SMBlibE_BAD);

    }

    /** @@@ mdz: check for guest login { **/
    if (SVAL(SMB_Hdr(pkt), SMB_ssetpr_act_offset) & 0x1) {
        /* do we allow guest login? NO! */
        return (SMBlibE_BAD);
    }
    /** @@@ mdz: } **/

#ifdef DEBUG
    fprintf(stderr, "SessSetupAndX response. Action = %i\n",
            SVAL(SMB_Hdr(pkt), SMB_ssetpr_act_offset));
#endif

    /* Now pick up the UID for future reference ... */

    Con_Handle -> uid = SVAL(SMB_Hdr(pkt), SMB_hdr_uid_offset);
    RFCNB_Free_Pkt(pkt);

    return(0);

}

/* Disconnect from the server, and disconnect all tree connects */

int SMB_Discon(SMB_Handle_Type Con_Handle, BOOL KeepHandle)

{

    /* We just disconnect the connection for now ... */

    RFCNB_Hangup(Con_Handle -> Trans_Connect);

    if (!KeepHandle)
        free(Con_Handle);

    return(0);

}