1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2010 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 "../m_hash.h"
19 #include "socketengine.h"
23 #include "treeserver.h"
25 #include "treesocket.h"
26 #include "resolvers.h"
28 const std::string& TreeSocket::GetOurChallenge()
30 return capab->ourchallenge;
33 void TreeSocket::SetOurChallenge(const std::string &c)
35 capab->ourchallenge = c;
38 const std::string& TreeSocket::GetTheirChallenge()
40 return capab->theirchallenge;
43 void TreeSocket::SetTheirChallenge(const std::string &c)
45 capab->theirchallenge = c;
48 std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
50 /* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
51 * suggesting the use of HMAC to secure the password against various attacks.
53 * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
54 * HMAC challenge/response.
56 HashProvider* sha256 = ServerInstance->Modules->FindDataService<HashProvider>("hash/sha256");
57 if (Utils->ChallengeResponse && sha256 && !challenge.empty())
59 /* This is how HMAC is supposed to be done:
61 * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
63 * 5c and 36 were chosen as part of the HMAC standard, because they
64 * flip the bits in a way likely to strengthen the function.
66 std::string hmac1, hmac2;
68 for (size_t n = 0; n < password.length(); n++)
70 hmac1.push_back(static_cast<char>(password[n] ^ 0x5C));
71 hmac2.push_back(static_cast<char>(password[n] ^ 0x36));
74 if (proto_version >= 1202)
76 hmac2.append(challenge);
77 std::string hmac = sha256->hexsum(hmac1 + sha256->sum(hmac2));
79 return "AUTH:" + hmac;
83 // version 1.2 used a weaker HMAC, using hex output in the intermediate step
84 hmac2.append(challenge);
85 hmac2 = sha256->hexsum(hmac2);
87 std::string hmac = hmac1 + hmac2;
88 hmac = sha256->hexsum(hmac);
90 return "HMAC-SHA256:"+ hmac;
93 else if (!challenge.empty() && !sha256)
94 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
99 std::string TreeSocket::RandString(unsigned int ilength)
101 char* randombuf = new char[ilength+1];
104 int f = open("/dev/urandom", O_RDONLY, 0);
108 if (read(f, randombuf, ilength) < (int)ilength)
109 ServerInstance->Logs->Log("m_spanningtree", DEFAULT, "Entropy source has gone predictable (did not return enough data)");
115 for (unsigned int i = 0; i < ilength; i++)
116 randombuf[i] = rand();
119 for (unsigned int i = 0; i < ilength; i++)
121 char randchar = static_cast<char>(0x3F + (randombuf[i] & 0x3F));
129 bool TreeSocket::ComparePass(const Link& link, const std::string &theirs)
131 capab->auth_fingerprint = !link.Fingerprint.empty();
132 capab->auth_challenge = !capab->ourchallenge.empty() && !capab->theirchallenge.empty();
137 SocketCertificateRequest req(this, Utils->Creator, GetIOHook());
140 fp = req.cert->GetFingerprint();
144 if (capab->auth_challenge)
146 std::string our_hmac = MakePass(link.RecvPass, capab->ourchallenge);
148 /* Straight string compare of hashes */
149 if (our_hmac != theirs)
154 /* Straight string compare of plaintext */
155 if (link.RecvPass != theirs)
159 if (capab->auth_fingerprint)
161 /* Require fingerprint to exist and match */
162 if (link.Fingerprint != fp)
164 ServerInstance->SNO->WriteToSnoMask('l',"Invalid SSL fingerprint on link %s: need \"%s\" got \"%s\"",
165 link.Name.c_str(), link.Fingerprint.c_str(), fp.c_str());
166 SendError("Provided invalid SSL fingerprint " + fp + " - expected " + link.Fingerprint);
170 else if (!fp.empty())
172 ServerInstance->SNO->WriteToSnoMask('l', "SSL fingerprint for link %s is \"%s\". "
173 "You can improve security by specifying this in <link:fingerprint>.", link.Name.c_str(), fp.c_str());