diff options
Diffstat (limited to 'ntlm.c')
| -rw-r--r-- | ntlm.c | 264 |
1 files changed, 211 insertions, 53 deletions
@@ -3,6 +3,8 @@ * * Copyright (C) 2004 William Preston * + * *NTLMv2 support and domain name parsing by Miroslav Zajic, Nextsoft s.r.o.* + * * 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 @@ -19,12 +21,6 @@ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ -#ifdef WIN32 -#include "config-win32.h" -#else -#include "config.h" -#endif - #include "syshead.h" #if NTLM @@ -41,6 +37,21 @@ #include "memdbg.h" + +/* 64bit datatype macros */ +#ifdef _MSC_VER + /* MS compilers */ +# define UINTEGER64 __int64 +# define UINT64(c) c ## Ui64 +#else + /* Non MS compilers */ +# define UINTEGER64 unsigned long long +# define UINT64(c) c ## LL +#endif + + + + static void create_des_keys(const unsigned char *hash, unsigned char *key) { @@ -70,6 +81,61 @@ gen_md4_hash (const char* data, int data_len, char *result) memcpy (result, md, 16); } +static void +gen_hmac_md5 (const char* data, int data_len, const char* key, int key_len,char *result) +{ + unsigned int len; + + HMAC_CTX c; + HMAC_Init (&c, key, key_len, EVP_md5()); + HMAC_Update (&c, data, data_len); + HMAC_Final (&c, result, &len); + HMAC_CTX_cleanup(&c); +} + +static void +gen_timestamp (unsigned char *timestamp) +{ + /* Copies 8 bytes long timestamp into "timestamp" buffer. + * Timestamp is Little-endian, 64-bit signed value representing the number of tenths of a microsecond since January 1, 1601. + */ + + UINTEGER64 timestamp_ull; + + timestamp_ull = openvpn_time(NULL); + timestamp_ull = (timestamp_ull + UINT64(11644473600)) * UINT64(10000000); + + /* store little endian value */ + timestamp[0]= timestamp_ull & UINT64(0xFF); + timestamp[1]= (timestamp_ull >> 8) & UINT64(0xFF); + timestamp[2]= (timestamp_ull >> 16) & UINT64(0xFF); + timestamp[3]= (timestamp_ull >> 24) & UINT64(0xFF); + timestamp[4]= (timestamp_ull >> 32) & UINT64(0xFF); + timestamp[5]= (timestamp_ull >> 40) & UINT64(0xFF); + timestamp[6]= (timestamp_ull >> 48) & UINT64(0xFF); + timestamp[7]= (timestamp_ull >> 56) & UINT64(0xFF); +} + +static void +gen_nonce (unsigned char *nonce) +{ + /* Generates 8 random bytes to be used as client nonce */ + int i; + + for(i=0;i<8;i++){ + nonce[i] = (unsigned char)get_random(); + } +} + +unsigned char *my_strupr(unsigned char *str) +{ + /* converts string to uppercase in place */ + unsigned char *tmp = str;; + + do *str = toupper(*str); while (*(++str)); + return tmp; +} + static int unicodize (char *dst, const char *src) { @@ -85,6 +151,18 @@ unicodize (char *dst, const char *src) return i; } +static void +add_security_buffer(int sb_offset, void *data, int length, unsigned char *msg_buf, int *msg_bufpos) +{ + /* Adds security buffer data to a message and sets security buffer's offset and length */ + msg_buf[sb_offset] = (unsigned char)length; + msg_buf[sb_offset + 2] = msg_buf[sb_offset]; + msg_buf[sb_offset + 4] = (unsigned char)(*msg_bufpos & 0xff); + msg_buf[sb_offset + 5] = (unsigned char)((*msg_bufpos >> 8) & 0xff); + memcpy(&msg_buf[*msg_bufpos], data, msg_buf[sb_offset]); + *msg_bufpos += length; +} + const char * ntlm_phase_1 (const struct http_proxy_info *p, struct gc_arena *gc) { @@ -105,23 +183,56 @@ ntlm_phase_1 (const struct http_proxy_info *p, struct gc_arena *gc) const char * ntlm_phase_3 (const struct http_proxy_info *p, const char *phase_2, struct gc_arena *gc) { + /* NTLM handshake + * + * http://davenport.sourceforge.net/ntlm.html + * + */ + char pwbuf[sizeof (p->up.password) * 2]; /* for unicode password */ char buf2[128]; /* decoded reply from proxy */ - char phase3[146]; + unsigned char phase3[464]; char md4_hash[21]; - char challenge[8], response[24]; - int i, ret_val, buflen; + char challenge[8], ntlm_response[24]; + int i, ret_val; des_cblock key1, key2, key3; des_key_schedule sched1, sched2, sched3; - /* try a minimal NTLM handshake - * - * http://davenport.sourceforge.net/ntlm.html - * - */ + char ntlmv2_response[144]; + char userdomain_u[256]; /* for uppercase unicode username and domain */ + char userdomain[128]; /* the same as previous but ascii */ + char ntlmv2_hash[16]; + char ntlmv2_hmacmd5[16]; + char *ntlmv2_blob = ntlmv2_response + 16; /* inside ntlmv2_response, length: 128 */ + int ntlmv2_blob_size=0; + int phase3_bufpos = 0x40; /* offset to next security buffer data to be added */ + int len; + + char domain[128]; + char username[128]; + char *separator; + + bool ntlmv2_enabled = (p->auth_method == HTTP_AUTH_NTLM2); + ASSERT (strlen (p->up.username) > 0); ASSERT (strlen (p->up.password) > 0); + + /* username parsing */ + separator = strchr(p->up.username, '\\'); + if (separator == NULL) { + strncpy(username, p->up.username, sizeof(username)-1); + username[sizeof(username)-1]=0; + domain[0]=0; + } else { + strncpy(username, separator+1, sizeof(username)-1); + username[sizeof(username)-1]=0; + len = separator - p->up.username; + if (len > sizeof(domain) - 1) len = sizeof(domain) - 1; + strncpy(domain, p->up.username, len); + domain[len]=0; + } + /* fill 1st 16 bytes with md4 hash, disregard terminating null */ gen_md4_hash (pwbuf, unicodize (pwbuf, p->up.password) - 2, md4_hash); @@ -139,48 +250,95 @@ ntlm_phase_3 (const struct http_proxy_info *p, const char *phase_2, struct gc_ar challenge[i] = buf2[i+24]; } - create_des_keys ((unsigned char *)md4_hash, key1); - des_set_key_unchecked ((des_cblock *)key1, sched1); - des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)response, sched1, DES_ENCRYPT); - - create_des_keys ((unsigned char *)&(md4_hash[7]), key2); - des_set_key_unchecked ((des_cblock *)key2, sched2); - des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(response[8]), sched2, DES_ENCRYPT); - - create_des_keys ((unsigned char *)&(md4_hash[14]), key3); - des_set_key_unchecked ((des_cblock *)key3, sched3); - des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(response[16]), sched3, DES_ENCRYPT); - - /* clear reply */ - memset (phase3, 0, sizeof (phase3)); - - strcpy (phase3, "NTLMSSP\0"); - phase3[8] = 3; /* type 3 */ - - buflen = 0x58 + strlen (p->up.username); - if (buflen > (int) sizeof (phase3)) - buflen = sizeof (phase3); - - phase3[0x10] = buflen; /* lm not used */ - phase3[0x20] = buflen; /* default domain (i.e. proxy's domain) */ - phase3[0x30] = buflen; /* no workstation name supplied */ - phase3[0x38] = buflen; /* no session key */ - - phase3[0x14] = 24; /* ntlm response is 24 bytes long */ - phase3[0x16] = phase3[0x14]; - phase3[0x18] = 0x40; /* ntlm offset */ - memcpy (&(phase3[0x40]), response, 24); - - - phase3[0x24] = strlen (p->up.username); /* username in ascii */ - phase3[0x26] = phase3[0x24]; - phase3[0x28] = 0x58; - strncpy (&(phase3[0x58]), p->up.username, sizeof (phase3) - 0x58); - + if (ntlmv2_enabled){ /* Generate NTLMv2 response */ + + /* NTLMv2 hash */ + my_strupr(strcpy(userdomain, username)); + if (strlen(username) + strlen(domain) < sizeof(userdomain)) + strcat(userdomain, domain); + else + msg (M_INFO, "Warning: Username or domain too long"); + unicodize (userdomain_u, userdomain); + gen_hmac_md5(userdomain_u, 2 * strlen(userdomain), md4_hash, 16, ntlmv2_hash); + + /* NTLMv2 Blob */ + memset(ntlmv2_blob, 0, 128); /* Clear blob buffer */ + ntlmv2_blob[0x00]=1; /* Signature */ + ntlmv2_blob[0x01]=1; /* Signature */ + ntlmv2_blob[0x04]=0; /* Reserved */ + gen_timestamp(&ntlmv2_blob[0x08]); /* 64-bit Timestamp */ + gen_nonce(&ntlmv2_blob[0x10]); /* 64-bit Client Nonce */ + ntlmv2_blob[0x18]=0; /* Unknown, zero should work */ + + /* Add target information block to the blob */ + int tib_len; + if (( *((long *)&buf2[0x14]) & 0x00800000) == 0x00800000){ /* Check for Target Information block */ + tib_len = buf2[0x28];/* Get Target Information block size */ + if (tib_len > 96) tib_len = 96; + char *tib_ptr = buf2 + buf2[0x2c]; /* Get Target Information block pointer */ + memcpy(&ntlmv2_blob[0x1c], tib_ptr, tib_len); /* Copy Target Information block into the blob */ + } else { + tib_len = 0; + } + + ntlmv2_blob[0x1c + tib_len] = 0; /* Unknown, zero works */ + + /* Get blob length */ + ntlmv2_blob_size = 0x20 + tib_len; + + /* Add challenge from message 2 */ + memcpy(&ntlmv2_response[8], challenge, 8); + + /* hmac-md5 */ + gen_hmac_md5(&ntlmv2_response[8], ntlmv2_blob_size + 8, ntlmv2_hash, 16, ntlmv2_hmacmd5); + + /* Add hmac-md5 result to the blob */ + memcpy(ntlmv2_response, ntlmv2_hmacmd5, 16); /* Note: This overwrites challenge previously written at ntlmv2_response[8..15] */ + + } else { /* Generate NTLM response */ + + create_des_keys ((unsigned char *)md4_hash, key1); + des_set_key_unchecked ((des_cblock *)key1, sched1); + des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)ntlm_response, sched1, DES_ENCRYPT); + + create_des_keys ((unsigned char *)&(md4_hash[7]), key2); + des_set_key_unchecked ((des_cblock *)key2, sched2); + des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(ntlm_response[8]), sched2, DES_ENCRYPT); + + create_des_keys ((unsigned char *)&(md4_hash[14]), key3); + des_set_key_unchecked ((des_cblock *)key3, sched3); + des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(ntlm_response[16]), sched3, DES_ENCRYPT); + } + + + memset (phase3, 0, sizeof (phase3)); /* clear reply */ + + strcpy (phase3, "NTLMSSP\0"); /* signature */ + phase3[8] = 3; /* type 3 */ + + if (ntlmv2_enabled){ /* NTLMv2 response */ + add_security_buffer(0x14, ntlmv2_response, ntlmv2_blob_size + 16, phase3, &phase3_bufpos); + }else{ /* NTLM response */ + add_security_buffer(0x14, ntlm_response, 24, phase3, &phase3_bufpos); + } + + /* username in ascii */ + add_security_buffer(0x24, username, strlen (username), phase3, &phase3_bufpos); + + /* Set domain. If <domain> is empty, default domain will be used (i.e. proxy's domain) */ + add_security_buffer(0x1c, domain, strlen (domain), phase3, &phase3_bufpos); + + + /* other security buffers will be empty */ + phase3[0x10] = phase3_bufpos; /* lm not used */ + phase3[0x30] = phase3_bufpos; /* no workstation name supplied */ + phase3[0x38] = phase3_bufpos; /* no session key */ + + /* flags */ phase3[0x3c] = 0x02; /* negotiate oem */ phase3[0x3d] = 0x02; /* negotiate ntlm */ - return ((const char *)make_base64_string2 ((unsigned char *)phase3, buflen, gc)); + return ((const char *)make_base64_string2 ((unsigned char *)phase3, phase3_bufpos, gc)); } #else |