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 * ---------------------------------------------------
15 #include "commands/cmd_whois.h"
16 #include "commands/cmd_stats.h"
19 #include "../transport.h"
20 #include "../m_hash.h"
21 #include "socketengine.h"
25 #include "treeserver.h"
27 #include "treesocket.h"
28 #include "resolvers.h"
29 #include "handshaketimer.h"
31 /* $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 */
33 const std::string& TreeSocket::GetOurChallenge()
35 return this->ourchallenge;
38 void TreeSocket::SetOurChallenge(const std::string &c)
40 this->ourchallenge = c;
43 const std::string& TreeSocket::GetTheirChallenge()
45 return this->theirchallenge;
48 void TreeSocket::SetTheirChallenge(const std::string &c)
50 this->theirchallenge = c;
53 std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
55 /* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
56 * suggesting the use of HMAC to secure the password against various attacks.
58 * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
59 * HMAC challenge/response.
61 Module* sha256 = ServerInstance->Modules->Find("m_sha256.so");
62 if (Utils->ChallengeResponse && sha256 && !challenge.empty())
64 /* XXX: This is how HMAC is supposed to be done:
66 * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
68 * Note that we are encoding the hex hash, not the binary
69 * output of the hash which is slightly different to standard.
71 * 5c and 36 were chosen as part of the HMAC standard, because they
72 * flip the bits in a way likely to strengthen the function.
74 std::string hmac1, hmac2;
76 for (size_t n = 0; n < password.length(); n++)
78 hmac1 += static_cast<char>(password[n] ^ 0x5C);
79 hmac2 += static_cast<char>(password[n] ^ 0x36);
83 HashResetRequest(Utils->Creator, sha256).Send();
84 hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send();
86 HashResetRequest(Utils->Creator, sha256).Send();
87 std::string hmac = hmac1 + hmac2;
88 hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send();
90 return "HMAC-SHA256:"+ hmac;
92 else if (!challenge.empty() && !sha256)
93 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
98 std::string TreeSocket::RandString(unsigned int ilength)
100 char* randombuf = new char[ilength+1];
103 int f = open("/dev/urandom", O_RDONLY, 0);
107 if (read(f, randombuf, ilength) < ilength)
108 ServerInstance->Logs->Log("m_spanningtree", DEFAULT, "Entropy source has gone predictable (did not return enough data)");
114 for (unsigned int i = 0; i < ilength; i++)
115 randombuf[i] = rand();
118 for (unsigned int i = 0; i < ilength; i++)
120 char randchar = static_cast<char>(0x3F + (randombuf[i] & 0x3F));
128 bool TreeSocket::ComparePass(const Link& link, const std::string &theirs)
130 this->auth_fingerprint = !link.Fingerprint.empty();
131 this->auth_challenge = !ourchallenge.empty() && !theirchallenge.empty();
133 const char* fp = NULL;
135 fp = BufferedSocketFingerprintRequest(this, Utils->Creator, GetHook()).Send();
138 ServerInstance->Logs->Log("m_spanningtree", DEFAULT, std::string("Server SSL fingerprint ") + fp);
140 if (auth_fingerprint)
142 /* Require fingerprint to exist and match */
143 if (!fp || link.Fingerprint != std::string(fp))
149 std::string our_hmac = MakePass(link.RecvPass, ourchallenge);
151 /* Straight string compare of hashes */
152 return our_hmac == theirs;
155 /* Straight string compare of plaintext */
156 return link.RecvPass == theirs;