1
2
3
4
5
6
7 """Class representing a TLS session."""
8
9 from .utils.compat import *
10 from .mathtls import *
11 from .constants import *
12
14 """
15 This class represents a TLS session.
16
17 TLS distinguishes between connections and sessions. A new
18 handshake creates both a connection and a session. Data is
19 transmitted over the connection.
20
21 The session contains a more permanent record of the handshake. The
22 session can be inspected to determine handshake results. The
23 session can also be used to create a new connection through
24 "session resumption". If the client and server both support this,
25 they can create a new connection based on an old session without
26 the overhead of a full handshake.
27
28 The session for a L{tlslite.TLSConnection.TLSConnection} can be
29 retrieved from the connection's 'session' attribute.
30
31 @type srpUsername: str
32 @ivar srpUsername: The client's SRP username (or None).
33
34 @type clientCertChain: L{tlslite.x509certchain.X509CertChain}
35 @ivar clientCertChain: The client's certificate chain (or None).
36
37 @type serverCertChain: L{tlslite.x509certchain.X509CertChain}
38 @ivar serverCertChain: The server's certificate chain (or None).
39
40 @type tackExt: L{tack.structures.TackExtension.TackExtension}
41 @ivar tackExt: The server's TackExtension (or None).
42
43 @type tackInHelloExt: L{bool}
44 @ivar tackInHelloExt: True if a TACK was presented via TLS Extension.
45 """
46
48 self.masterSecret = bytearray(0)
49 self.sessionID = bytearray(0)
50 self.cipherSuite = 0
51 self.srpUsername = ""
52 self.clientCertChain = None
53 self.serverCertChain = None
54 self.tackExt = None
55 self.tackInHelloExt = False
56 self.serverName = ""
57 self.resumable = False
58
59 - def create(self, masterSecret, sessionID, cipherSuite,
60 srpUsername, clientCertChain, serverCertChain,
61 tackExt, tackInHelloExt, serverName, resumable=True):
62 self.masterSecret = masterSecret
63 self.sessionID = sessionID
64 self.cipherSuite = cipherSuite
65 self.srpUsername = srpUsername
66 self.clientCertChain = clientCertChain
67 self.serverCertChain = serverCertChain
68 self.tackExt = tackExt
69 self.tackInHelloExt = tackInHelloExt
70 self.serverName = serverName
71 self.resumable = resumable
72
74 other = Session()
75 other.masterSecret = self.masterSecret
76 other.sessionID = self.sessionID
77 other.cipherSuite = self.cipherSuite
78 other.srpUsername = self.srpUsername
79 other.clientCertChain = self.clientCertChain
80 other.serverCertChain = self.serverCertChain
81 other.tackExt = self.tackExt
82 other.tackInHelloExt = self.tackInHelloExt
83 other.serverName = self.serverName
84 other.resumable = self.resumable
85 return other
86
88 """If this session can be used for session resumption.
89
90 @rtype: bool
91 @return: If this session can be used for session resumption.
92 """
93 return self.resumable and self.sessionID
94
96
97 if (not boolean) or (boolean and self.sessionID):
98 self.resumable = boolean
99
101 if self.tackExt and self.tackExt.tack:
102 return self.tackExt.tack.getTackId()
103 else:
104 return None
105
107 if self.tackExt and self.tackExt.break_sigs:
108 return self.tackExt.break_sigs
109 else:
110 return None
111
113 """Get the name of the cipher used with this connection.
114
115 @rtype: str
116 @return: The name of the cipher used with this connection.
117 """
118 return CipherSuite.canonicalCipherName(self.cipherSuite)
119
121 """Get the name of the HMAC hash algo used with this connection.
122
123 @rtype: str
124 @return: The name of the HMAC hash algo used with this connection.
125 """
126 return CipherSuite.canonicalMacName(self.cipherSuite)
127