/[rdesktop]/sourceforge.net/trunk/rdesktop/secure.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Diff of /sourceforge.net/trunk/rdesktop/secure.c

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revision 82 by astrand, Tue Jul 30 07:18:48 2002 UTC revision 295 by matthewc, Tue Jan 28 11:36:02 2003 UTC
# Line 1  Line 1 
1  /*  /*
2     rdesktop: A Remote Desktop Protocol client.     rdesktop: A Remote Desktop Protocol client.
3     Protocol services - RDP encryption and licensing     Protocol services - RDP encryption and licensing
4     Copyright (C) Matthew Chapman 1999-2001     Copyright (C) Matthew Chapman 1999-2002
5    
6     This program is free software; you can redistribute it and/or modify     This program is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by     it under the terms of the GNU General Public License as published by
# Line 285  reverse(uint8 * p, int len) Line 285  reverse(uint8 * p, int len)
285  static void  static void
286  sec_rsa_encrypt(uint8 * out, uint8 * in, int len, uint8 * modulus, uint8 * exponent)  sec_rsa_encrypt(uint8 * out, uint8 * in, int len, uint8 * modulus, uint8 * exponent)
287  {  {
288          BN_CTX ctx;          BN_CTX *ctx;
289          BIGNUM mod, exp, x, y;          BIGNUM mod, exp, x, y;
290          uint8 inr[SEC_MODULUS_SIZE];          uint8 inr[SEC_MODULUS_SIZE];
291          int outlen;          int outlen;
# Line 295  sec_rsa_encrypt(uint8 * out, uint8 * in, Line 295  sec_rsa_encrypt(uint8 * out, uint8 * in,
295          memcpy(inr, in, len);          memcpy(inr, in, len);
296          reverse(inr, len);          reverse(inr, len);
297    
298          BN_CTX_init(&ctx);          ctx = BN_CTX_new();
299          BN_init(&mod);          BN_init(&mod);
300          BN_init(&exp);          BN_init(&exp);
301          BN_init(&x);          BN_init(&x);
# Line 304  sec_rsa_encrypt(uint8 * out, uint8 * in, Line 304  sec_rsa_encrypt(uint8 * out, uint8 * in,
304          BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod);          BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod);
305          BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp);          BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp);
306          BN_bin2bn(inr, len, &x);          BN_bin2bn(inr, len, &x);
307          BN_mod_exp(&y, &x, &exp, &mod, &ctx);          BN_mod_exp(&y, &x, &exp, &mod, ctx);
308          outlen = BN_bn2bin(&y, out);          outlen = BN_bn2bin(&y, out);
309          reverse(out, outlen);          reverse(out, outlen);
310          if (outlen < SEC_MODULUS_SIZE)          if (outlen < SEC_MODULUS_SIZE)
# Line 314  sec_rsa_encrypt(uint8 * out, uint8 * in, Line 314  sec_rsa_encrypt(uint8 * out, uint8 * in,
314          BN_clear_free(&x);          BN_clear_free(&x);
315          BN_free(&exp);          BN_free(&exp);
316          BN_free(&mod);          BN_free(&mod);
317          BN_CTX_free(&ctx);          BN_CTX_free(ctx);
318  }  }
319    
320  /* Initialise secure transport packet */  /* Initialise secure transport packet */
# Line 363  sec_send(STREAM s, uint32 flags) Line 363  sec_send(STREAM s, uint32 flags)
363    
364  /* Transfer the client random to the server */  /* Transfer the client random to the server */
365  static void  static void
366  sec_establish_key()  sec_establish_key(void)
367  {  {
368          uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE;          uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE;
369          uint32 flags = SEC_CLIENT_RANDOM;          uint32 flags = SEC_CLIENT_RANDOM;
# Line 385  sec_out_mcs_data(STREAM s) Line 385  sec_out_mcs_data(STREAM s)
385  {  {
386          int hostlen = 2 * strlen(hostname);          int hostlen = 2 * strlen(hostname);
387    
388            if (hostlen > 30)
389                    hostlen = 30;
390    
391          out_uint16_be(s, 5);    /* unknown */          out_uint16_be(s, 5);    /* unknown */
392          out_uint16_be(s, 0x14);          out_uint16_be(s, 0x14);
393          out_uint8(s, 0x7c);          out_uint8(s, 0x7c);
# Line 422  sec_out_mcs_data(STREAM s) Line 425  sec_out_mcs_data(STREAM s)
425          out_uint32_le(s, 12);          out_uint32_le(s, 12);
426          out_uint8s(s, 64);      /* reserved? 4 + 12 doublewords */          out_uint8s(s, 64);      /* reserved? 4 + 12 doublewords */
427    
428          out_uint16(s, 0xca01);          out_uint16_le(s, 0xca01);
429          out_uint16(s, 0);          out_uint16(s, 0);
430    
431          /* Client encryption settings */          /* Client encryption settings */
432          out_uint16_le(s, SEC_TAG_CLI_CRYPT);          out_uint16_le(s, SEC_TAG_CLI_CRYPT);
433          out_uint16(s, 8);       /* length */          out_uint16_le(s, 8);    /* length */
434          out_uint32_le(s, encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */          out_uint32_le(s, encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */
435          s_mark_end(s);          s_mark_end(s);
436  }  }
# Line 471  sec_parse_crypt_info(STREAM s, uint32 * Line 474  sec_parse_crypt_info(STREAM s, uint32 *
474    
475          in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */          in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */
476          in_uint32_le(s, crypt_level);   /* 1 = low, 2 = medium, 3 = high */          in_uint32_le(s, crypt_level);   /* 1 = low, 2 = medium, 3 = high */
477            if (crypt_level == 0)   /* no encryptation */
478                    return False;
479          in_uint32_le(s, random_len);          in_uint32_le(s, random_len);
480          in_uint32_le(s, rsa_info_len);          in_uint32_le(s, rsa_info_len);
481    
# Line 542  sec_process_mcs_data(STREAM s) Line 547  sec_process_mcs_data(STREAM s)
547  {  {
548          uint16 tag, length;          uint16 tag, length;
549          uint8 *next_tag;          uint8 *next_tag;
550            uint8 len;
551    
552          in_uint8s(s, 23);       /* header */          in_uint8s(s, 21);       /* header */
553            in_uint8(s, len);
554            if (len & 0x80)
555                    in_uint8(s, len);
556    
557          while (s->p < s->end)          while (s->p < s->end)
558          {          {
# Line 575  sec_process_mcs_data(STREAM s) Line 584  sec_process_mcs_data(STREAM s)
584    
585  /* Receive secure transport packet */  /* Receive secure transport packet */
586  STREAM  STREAM
587  sec_recv()  sec_recv(void)
588  {  {
589          uint32 sec_flags;          uint32 sec_flags;
590          STREAM s;          STREAM s;
# Line 622  sec_connect(char *server) Line 631  sec_connect(char *server)
631          sec_process_mcs_data(&mcs_data);          sec_process_mcs_data(&mcs_data);
632          if (encryption)          if (encryption)
633                  sec_establish_key();                  sec_establish_key();
634            xfree(mcs_data.data);
635          return True;          return True;
636  }  }
637    
638  /* Disconnect a connection */  /* Disconnect a connection */
639  void  void
640  sec_disconnect()  sec_disconnect(void)
641  {  {
642          mcs_disconnect();          mcs_disconnect();
643  }  }
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