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nmap/nping/NEPContext.cc
d33tah ccd0c02a4c Add a lacking space in the license comment. The command I used to do this is: 
for file in `grep "* including the terms and conditions of this license text as well.       \*" * -r --files-with-match `; do sed "s/\* including the terms and conditions of this license text as well.       \*/* including the terms and conditions of this license text as well.        */g" -i $file; done
2013-09-11 19:06:20 +00:00

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/***************************************************************************
* NEPContext.cc -- *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2013 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. This program is free *
* software; you may redistribute and/or modify it under the terms of the *
* GNU General Public License as published by the Free Software *
* Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
* AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your right to use, *
* modify, and redistribute this software under certain conditions. If *
* you wish to embed Nmap technology into proprietary software, we sell *
* alternative licenses (contact sales@nmap.com). Dozens of software *
* vendors already license Nmap technology such as host discovery, port *
* scanning, OS detection, version detection, and the Nmap Scripting *
* Engine. *
* *
* Note that the GPL places important restrictions on "derivative works", *
* yet it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* derivative work for the purpose of this license if it does any of the *
* following with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
* or nmap-service-probes. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* Nmap with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* As another special exception to the GPL terms, Insecure.Com LLC grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
* linked combinations including the two. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* Nmap or grant special permissions to use it in other open source *
* software. Please contact fyodor@nmap.org with any such requests. *
* Similarly, we don't incorporate incompatible open source software into *
* Covered Software without special permission from the copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* Nmap in other works, are happy to help. As mentioned above, we also *
* offer alternative license to integrate Nmap into proprietary *
* applications and appliances. These contracts have been sold to dozens *
* of software vendors, and generally include a perpetual license as well *
* as providing for priority support and updates. They also fund the *
* continued development of Nmap. Please email sales@nmap.com for further *
* information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes (none *
* have been found so far). *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to send your changes *
* to the dev@nmap.org mailing list for possible incorporation into the *
* main distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify otherwise) *
* that you are offering the Nmap Project (Insecure.Com LLC) the *
* unlimited, non-exclusive right to reuse, modify, and relicense the *
* code. Nmap will always be available Open Source, but this is important *
* because the inability to relicense code has caused devastating problems *
* for other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* 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 Nmap *
* license file for more details (it's in a COPYING file included with *
* Nmap, and also available from https://svn.nmap.org/nmap/COPYING *
* *
***************************************************************************/
#include "nping.h"
#include "NEPContext.h"
#include "Crypto.h"
#include "EchoHeader.h"
#include "nbase.h"
#include "NpingOps.h"
extern NpingOps o;
NEPContext::NEPContext() {
this->reset();
} /* End of NEPContext constructor */
NEPContext::~NEPContext() {
} /* End of NEPContext destructor */
/** Sets every attribute to its default value- */
void NEPContext::reset() {
this->id=CLIENT_NOT_FOUND;
this->nsi=NULL;
this->state=STATE_LISTEN;
this->last_seq_client=0;
this->last_seq_server=0;
memset(this->next_iv_enc, 0, CIPHER_BLOCK_SIZE);
memset(this->next_iv_dec, 0, CIPHER_BLOCK_SIZE);
memset(this->nep_key_mac_c2s, 0, MAC_KEY_LEN);
memset(this->nep_key_mac_s2c, 0, MAC_KEY_LEN);
memset(this->nep_key_ciphertext_c2s, 0, CIPHER_KEY_LEN);
memset(this->nep_key_ciphertext_s2c, 0, CIPHER_KEY_LEN);
memset(this->server_nonce, 0, NONCE_LEN);
memset(this->client_nonce, 0, NONCE_LEN);
memset(&this->clnt_addr, 0, sizeof(struct sockaddr_storage ));
server_nonce_set=false;
client_nonce_set=false;
} /* End of reset() */
clientid_t NEPContext::getIdentifier(){
return this->id;
} /* End of getIdentifier() */
int NEPContext::setIdentifier(clientid_t clnt){
this->id=clnt;
return OP_SUCCESS;
} /* End of setIdentifier() */
struct sockaddr_storage NEPContext::getAddress(){
return this->clnt_addr;
} /* End of getAddress() */
int NEPContext::setAddress(struct sockaddr_storage a){
this->clnt_addr=a;
return OP_SUCCESS;
} /* End of setAddress() */
nsock_iod NEPContext::getNsockIOD(){
return this->nsi;
} /* End of getNsockIOD() */
int NEPContext::setNsockIOD(nsock_iod iod){
this->nsi=iod;
return OP_SUCCESS;
} /* End of setNsockIOD() */
bool NEPContext::ready(){
return (this->state==STATE_READY_SENT);
}
int NEPContext::setState(int st){
this->state=st;
return OP_SUCCESS;
} /* End of setState() */
int NEPContext::getState(){
return this->state;
} /* End of getState() */
int NEPContext::setNextEncryptionIV(u8 *block){
if(block==NULL)
return OP_FAILURE;
else{
memcpy(this->next_iv_enc, block, CIPHER_BLOCK_SIZE);
return OP_SUCCESS;
}
} /* End of setLastBlock4Encryption() */
u8 *NEPContext::getNextEncryptionIV(size_t *final_len){
if(final_len!=NULL)
*final_len=CIPHER_BLOCK_SIZE;
return this->next_iv_enc;
} /* End of getLastBlock4Encryption() */
u8 *NEPContext::getNextEncryptionIV(){
return this->getNextEncryptionIV(NULL);
} /* End of getLastBlock4Encryption() */
int NEPContext::setNextDecryptionIV(u8 *block){
if(block==NULL)
return OP_FAILURE;
else{
memcpy(this->next_iv_dec, block, CIPHER_BLOCK_SIZE);
return OP_SUCCESS;
}
} /* End of setLastBlock4Decryption() */
u8 *NEPContext::getNextDecryptionIV(size_t *final_len){
if(final_len!=NULL)
*final_len=CIPHER_BLOCK_SIZE;
return this->next_iv_dec;
} /* End of getLastBlock4Decryption() */
u8 *NEPContext::getNextDecryptionIV(){
return this->getNextDecryptionIV(NULL);
} /* End of getLastBlock4Decryption() */
int NEPContext::setLastServerSequence(u32 seq){
this->last_seq_server=seq;
return OP_SUCCESS;
} /* End of setLastServerSequence() */
u32 NEPContext::getLastServerSequence(){
return this->last_seq_server;
} /* End of getLastServerSequence() */
/** Increments current server sequence number by one and returns it.
* @warning this function changes object's internal state. It should be
* called only when the caller wants to increment the internal last_seq_client
* attribute. */
u32 NEPContext::getNextServerSequence(){
if( this->last_seq_server==0xFFFFFFFF)
this->last_seq_server=0; /* Wrap back to zero */
else
this->last_seq_server++;
return this->last_seq_server;
} /* End of getNextServerSequence() */
int NEPContext::setLastClientSequence(u32 seq){
this->last_seq_client=seq;
return OP_SUCCESS;
} /* End of setLastClientSequence() */
u32 NEPContext::getLastClientSequence(){
return this->last_seq_client;
} /* End of getLastClientSequence() */
/** Increments current client sequence number by one and returns it.
* @warning this function changes object's internal state. It should be
* called only when the caller wants to increment the internal last_seq_client
* attribute. */
u32 NEPContext::getNextClientSequence(){
if( this->last_seq_client==0xFFFFFFFF)
this->last_seq_client=0; /* Wrap back to zero */
else
this->last_seq_client++;
return this->last_seq_client;
} /* End of getNextClientSequence() */
int NEPContext::generateInitialServerSequence(){
return Crypto::generateNonce((u8 *)&(this->last_seq_server), sizeof(u32));
} /* End of generateInitialServerSequence() */
int NEPContext::generateInitialClientSequence(){
return Crypto::generateNonce((u8 *)&(this->last_seq_client), sizeof(u32));
} /* End of generateInitialClientSequence() */
u8 *NEPContext::generateKey(int key_type, size_t *final_len){
u8 data[1024];
char key_type_id[128+1];
size_t len=0;
/* Copy the passphrase */
char *passphrase=o.getEchoPassphrase();
size_t plen=strlen(passphrase);
memcpy(data, passphrase, plen);
len+=plen;
/* Copy the nonces */
memcpy(data+len, this->getServerNonce(), NONCE_LEN );
len+=NONCE_LEN;
if(key_type==MAC_KEY_S2C_INITIAL){
memset(data+len, 0, NONCE_LEN); /* Empty nonce in this case */
len+=NONCE_LEN;
}else{
memcpy(data+len, this->getClientNonce(), NONCE_LEN);
len+=NONCE_LEN;
}
switch(key_type){
case MAC_KEY_S2C_INITIAL:
strncpy(key_type_id, "NEPkeyforMACServer2ClientInitial", 128);
break;
case MAC_KEY_S2C:
strncpy(key_type_id, "NEPkeyforMACServer2Client", 128);
break;
case MAC_KEY_C2S:
strncpy(key_type_id, "NEPkeyforMACClient2Server", 128);
break;
case CIPHER_KEY_C2S:
strncpy(key_type_id, "NEPkeyforCiphertextClient2Server", 128);
break;
case CIPHER_KEY_S2C:
strncpy(key_type_id, "NEPkeyforCiphertextServer2Client", 128);
break;
default:
return NULL;
break;
}
/* Copy the id */
memcpy(data+len, key_type_id, strlen(key_type_id));
len+=strlen(key_type_id);
return Crypto::deriveKey(data, len, final_len);
} /* End of generateKey() */
/** Set key for C->S MAC computation (NEP_KEY_MAC_C2S)*/
int NEPContext::setMacKeyC2S(u8 *key){
if(key==NULL)
return OP_FAILURE;
else
memcpy(this->nep_key_mac_c2s, key, MAC_KEY_LEN);
return OP_SUCCESS;
} /* End of setMacKeyC2S() */
/** Returns NEP_KEY_MAC_C2S key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getMacKeyC2S(size_t *final_len){
if(final_len!=NULL)
*final_len=MAC_KEY_LEN;
return this->nep_key_mac_c2s;
} /* End of getMacKeyC2S() */
/** Returns NEP_KEY_MAC_C2S key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getMacKeyC2S(){
return this->getMacKeyC2S(NULL);
} /* End of getMacKeyC2S() */
int NEPContext::generateMacKeyC2S(){
u8 *key=NULL;
size_t len=0;
if( (key=this->generateKey(MAC_KEY_C2S, &len))==NULL )
return OP_FAILURE;
return this->setMacKeyC2S(key);
} /* End of generateMacKeyC2S() */
/** Set key for S->C MAC computation (NEP_KEY_MAC_S2C) */
int NEPContext::setMacKeyS2C(u8 *key){
if(key==NULL)
return OP_FAILURE;
else
memcpy(this->nep_key_mac_s2c, key, MAC_KEY_LEN);
return OP_SUCCESS;
} /* End of setMacKeyS2C() */
/** Returns NEP_KEY_MAC_S2C key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getMacKeyS2C(size_t *final_len){
if(final_len!=NULL)
*final_len=MAC_KEY_LEN;
return this->nep_key_mac_s2c;
} /* End of getMacKeyS2C() */
/** Returns NEP_KEY_MAC_S2C key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getMacKeyS2C(){
return this->getMacKeyS2C(NULL);
} /* End of getMacKeyS2C() */
int NEPContext::generateMacKeyS2C(){
u8 *key=NULL;
size_t len=0;
if( (key=this->generateKey(MAC_KEY_S2C, &len))==NULL )
return OP_FAILURE;
return this->setMacKeyS2C(key);
} /* End of generateMacKeyS2C() */
int NEPContext::generateMacKeyS2CInitial(){
u8 *key=NULL;
size_t len=0;
if( (key=this->generateKey(MAC_KEY_S2C_INITIAL, &len))==NULL )
return OP_FAILURE;
return this->setMacKeyS2C(key);
} /* End of generateMacKeyS2CInitial() */
/** Set cipher key for C->S ciphertext (NEP_KEY_CIPHERTEXT_C2S) */
int NEPContext::setCipherKeyC2S(u8 *key){
if(key==NULL)
return OP_FAILURE;
else
memcpy(this->nep_key_ciphertext_c2s, key, CIPHER_KEY_LEN);
return OP_SUCCESS;
} /* End of setCipherKeyC2S() */
/** Returns NEP_KEY_CIPHERTEXT_C2S key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getCipherKeyC2S(size_t *final_len){
if(final_len!=NULL)
*final_len=MAC_KEY_LEN;
return this->nep_key_ciphertext_c2s;
} /* End of getCipherKeyC2S() */
/** Returns NEP_KEY_CIPHERTEXT_C2S key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getCipherKeyC2S(){
return this->getCipherKeyC2S(NULL);
} /* End of getCipherKeyC2S() */
int NEPContext::generateCipherKeyC2S(){
u8 *key=NULL;
size_t len=0;
if( (key=this->generateKey(CIPHER_KEY_C2S, &len))==NULL )
return OP_FAILURE;
return this->setCipherKeyC2S(key);
} /* End of generateCipherKeyC2S() */
/** Set cipher key for S->C ciphertext (NEP_KEY_CIPHERTEXT_S2C) */
int NEPContext::setCipherKeyS2C(u8 *key){
if(key==NULL)
return OP_FAILURE;
else
memcpy(this->nep_key_ciphertext_s2c, key, CIPHER_KEY_LEN);
return OP_SUCCESS;
} /* End of setCipherKeyS2C() */
/** Returns NEP_KEY_CIPHERTEXT_S2C key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getCipherKeyS2C(size_t *final_len){
if(final_len!=NULL)
*final_len=CIPHER_KEY_LEN;
return this->nep_key_ciphertext_s2c;
} /* End of getCipherKeyS2C() */
/** Returns NEP_KEY_CIPHERTEXT_S2C key. If final_len is not NULL, key length
* is stored in it. */
u8 *NEPContext::getCipherKeyS2C(){
return this->getCipherKeyS2C(NULL);
} /* End of getCipherKeyS2C() */
int NEPContext::generateCipherKeyS2C(){
u8 *key=NULL;
size_t len=0;
if( (key=this->generateKey(CIPHER_KEY_S2C, &len))==NULL )
return OP_FAILURE;
return this->setCipherKeyS2C(key);
} /* End of generateCipherKeyS2C() */
/** Generates a random nonce which is, if possible, cryptographically secure.
* This method is used by the Echo client to generate its own nonce for the
* initial NEP_HANDSHAKE_CLIENT message */
int NEPContext::generateClientNonce(){
return Crypto::generateNonce(this->client_nonce, NONCE_LEN);
} /* End of generateClientNonce() */
/** Generates a random nonce which is, if possible, cryptographically secure.
* This method is used by the Echo server to generate its own nonce for the
* initial NEP_HANDSHAKE_SERVER message */
int NEPContext::generateServerNonce(){
return Crypto::generateNonce(this->server_nonce, NONCE_LEN);
} /* End of generateServerNonce() */
/** This method is used by the Echo server to store the initial nonce received
* from the client. */
int NEPContext::setClientNonce(u8 *buff){
if(buff==NULL)
return OP_FAILURE;
else{
memcpy(this->client_nonce, buff, NONCE_LEN);
this->client_nonce_set=true;
}
return OP_SUCCESS;
} /* End of setClientNonce() */
/** This method is used by the Echo client to store the initial nonce received
* from the server. */
int NEPContext::setServerNonce(u8 *buff){
if(buff==NULL)
return OP_FAILURE;
else{
memcpy(this->server_nonce, buff, NONCE_LEN);
this->server_nonce_set=true;
}
return OP_SUCCESS;
} /* End of setServerNonce() */
u8 *NEPContext::getClientNonce(){
return this->client_nonce;
} /* End of getClientNonce() */
u8 *NEPContext::getServerNonce(){
return this->server_nonce;
} /* End of getServerNonce() */
/** Adds a field specifier, received from the client in a NEP_PACKET_SPEC
* message. */
int NEPContext::addClientFieldSpec(u8 field, u8 len, u8 *value){
fspec_t t;
if(value==NULL){
return OP_FAILURE;
}else{
t.field=field;
t.len=MIN(len, PACKETSPEC_FIELD_LEN);
memcpy(t.value, value, t.len);
this->fspecs.push_back(t);
}
return OP_SUCCESS;
} /* End of addClientFieldSpec() */
/** Returns a pointer to the N-th client's field specifier. Callers should start
* passing 0 and then incrementing the index by one until it returns NULL */
fspec_t *NEPContext::getClientFieldSpec(int index){
if(index<0 || index>=(int)this->fspecs.size() )
return NULL;
else
return &(this->fspecs[index]);
} /* End of getClientFieldSpec() */
/** Returns true if we already have a packet spec of the same type. This
* method should be called for EVERY spec in a NEP_PACKET_SPEC message, to
* ensure that malicious clients are not supplying the same spec repeatedly
* to increase their packet score. */
bool NEPContext::isDuplicateFieldSpec(u8 test_field){
int i=0;
fspec_t *spec=NULL;
/* Iterate through the list of stored specs and determine if we already
have a spec of the same type. */
while( (spec=this->getClientFieldSpec(i++))!=NULL ){
if(spec->field==test_field)
return true;
}
return false;
} /* End of isDuplicateFieldSpect() */
/** Deletes all previous field specifiers. This should be used when dealing
* with clients that send multiple NEP_PACKET_SPEC messages, so only the last
* PacketSpec is taken into account. */
int NEPContext::resetClientFieldSpecs(){
this->fspecs.empty();
return OP_SUCCESS;
} /* End of resetClientFieldSpecs() */
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