1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2009 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
17 #include "../transport.h"
18 #include "../m_hash.h"
19 #include "socketengine.h"
23 #include "treeserver.h"
25 #include "treesocket.h"
26 #include "resolvers.h"
27 #include "handshaketimer.h"
29 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h */
31 const std::string& TreeSocket::GetOurChallenge()
33 return this->ourchallenge;
36 void TreeSocket::SetOurChallenge(const std::string &c)
38 this->ourchallenge = c;
41 const std::string& TreeSocket::GetTheirChallenge()
43 return this->theirchallenge;
46 void TreeSocket::SetTheirChallenge(const std::string &c)
48 this->theirchallenge = c;
51 std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
53 /* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
54 * suggesting the use of HMAC to secure the password against various attacks.
56 * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
57 * HMAC challenge/response.
59 Module* sha256 = ServerInstance->Modules->Find("m_sha256.so");
60 if (Utils->ChallengeResponse && sha256 && !challenge.empty())
62 /* XXX: This is how HMAC is supposed to be done:
64 * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
66 * Note that we are encoding the hex hash, not the binary
67 * output of the hash which is slightly different to standard.
69 * 5c and 36 were chosen as part of the HMAC standard, because they
70 * flip the bits in a way likely to strengthen the function.
72 std::string hmac1, hmac2;
74 for (size_t n = 0; n < password.length(); n++)
76 hmac1 += static_cast<char>(password[n] ^ 0x5C);
77 hmac2 += static_cast<char>(password[n] ^ 0x36);
81 HashResetRequest(Utils->Creator, sha256).Send();
82 hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send();
84 HashResetRequest(Utils->Creator, sha256).Send();
85 std::string hmac = hmac1 + hmac2;
86 hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send();
88 return "HMAC-SHA256:"+ hmac;
90 else if (!challenge.empty() && !sha256)
91 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
96 std::string TreeSocket::RandString(unsigned int ilength)
98 char* randombuf = new char[ilength+1];
101 int f = open("/dev/urandom", O_RDONLY, 0);
105 if (read(f, randombuf, ilength) < (int)ilength)
106 ServerInstance->Logs->Log("m_spanningtree", DEFAULT, "Entropy source has gone predictable (did not return enough data)");
112 for (unsigned int i = 0; i < ilength; i++)
113 randombuf[i] = rand();
116 for (unsigned int i = 0; i < ilength; i++)
118 char randchar = static_cast<char>(0x3F + (randombuf[i] & 0x3F));
126 bool TreeSocket::ComparePass(const Link& link, const std::string &theirs)
128 this->auth_fingerprint = !link.Fingerprint.empty();
129 this->auth_challenge = !ourchallenge.empty() && !theirchallenge.empty();
134 BufferedSocketCertificateRequest req(this, Utils->Creator, GetHook());
138 fp = req.cert->GetFingerprint();
139 ServerInstance->Logs->Log("m_spanningtree", DEFAULT, std::string("Server SSL fingerprint ") + fp);
143 if (auth_fingerprint)
145 /* Require fingerprint to exist and match */
146 if (link.Fingerprint != fp)
148 ServerInstance->SNO->WriteToSnoMask('l',"Invalid SSL fingerprint on link %s: need '%s' got '%s'",
149 link.Name.c_str(), link.Fingerprint.c_str(), fp.c_str());
156 std::string our_hmac = MakePass(link.RecvPass, ourchallenge);
158 /* Straight string compare of hashes */
159 return our_hmac == theirs;
162 /* Straight string compare of plaintext */
163 return link.RecvPass == theirs;