1 | """Extend M2Crypto SSL functionality for cert verification and custom |
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2 | timeout settings. |
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3 | |
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4 | NERC DataGrid Project""" |
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5 | __author__ = "P J Kershaw" |
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6 | __date__ = "02/07/07" |
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7 | __copyright__ = "(C) 2009 Science and Technology Facilities Council" |
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8 | __license__ = "BSD - see LICENSE file in top-level directory" |
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9 | __contact__ = "Philip.Kershaw@stfc.ac.uk" |
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10 | __revision__ = '$Id: $' |
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11 | import logging |
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12 | log = logging.getLogger(__name__) |
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13 | |
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14 | import os |
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15 | import re |
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16 | |
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17 | from M2Crypto import SSL, X509 |
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18 | from M2Crypto.httpslib import HTTPSConnection as _HTTPSConnection |
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19 | |
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20 | from ndg.security.common.X509 import X509Cert, X509Stack, X500DN |
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21 | |
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22 | |
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23 | class InvalidCertSignature(SSL.Checker.SSLVerificationError): |
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24 | """Raise if verification against CA cert public key fails""" |
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25 | |
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26 | |
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27 | class InvalidCertDN(SSL.Checker.SSLVerificationError): |
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28 | """Raise if verification against a list acceptable DNs fails""" |
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29 | |
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30 | |
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31 | class HostCheck(SSL.Checker.Checker, object): |
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32 | """Override SSL.Checker.Checker to enable alternate Common Name |
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33 | setting match for peer cert""" |
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34 | |
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35 | def __init__(self, |
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36 | peerCertDN=None, |
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37 | peerCertCN=None, |
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38 | acceptedDNs=[], |
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39 | caCertList=[], |
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40 | caCertFilePathList=[], |
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41 | **kw): |
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42 | """Override parent class __init__ to enable setting of myProxyServerDN |
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43 | setting |
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44 | |
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45 | @type peerCertDN: string/list |
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46 | @param peerCertDN: Set the expected Distinguished Name of the |
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47 | server to avoid errors matching hostnames. This is useful |
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48 | where the hostname is not fully qualified. |
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49 | |
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50 | *param acceptedDNs: a list of acceptable DNs. This enables validation |
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51 | where the expected DN is where against a limited list of certs. |
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52 | |
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53 | @type peerCertCN: string |
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54 | @param peerCertCN: enable alternate Common Name to peer |
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55 | hostname |
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56 | |
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57 | @type caCertList: list type of M2Crypto.X509.X509 types |
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58 | @param caCertList: CA X.509 certificates - if set the peer cert's |
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59 | CA signature is verified against one of these. At least one must |
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60 | verify |
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61 | |
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62 | @type caCertFilePathList: list string types |
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63 | @param caCertFilePathList: same as caCertList except input as list |
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64 | of CA cert file paths""" |
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65 | |
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66 | SSL.Checker.Checker.__init__(self, **kw) |
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67 | |
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68 | self.peerCertDN = peerCertDN |
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69 | self.peerCertCN = peerCertCN |
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70 | self.acceptedDNs = acceptedDNs |
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71 | |
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72 | if caCertList: |
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73 | self.caCertList = caCertList |
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74 | elif caCertFilePathList: |
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75 | self.caCertFilePathList = caCertFilePathList |
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76 | else: |
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77 | # Set default to enable len() test in __call__ |
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78 | self.__caCertStack = () |
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79 | |
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80 | def __call__(self, peerCert, host=None): |
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81 | """Carry out checks on server ID |
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82 | @param peerCert: MyProxy server host certificate as M2Crypto.X509.X509 |
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83 | instance |
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84 | @param host: name of host to check |
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85 | """ |
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86 | if peerCert is None: |
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87 | raise SSL.Checker.NoCertificate('SSL Peer did not return ' |
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88 | 'certificate') |
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89 | |
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90 | peerCertDN = '/'+peerCert.get_subject().as_text().replace(', ', '/') |
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91 | try: |
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92 | SSL.Checker.Checker.__call__(self, peerCert, host=self.peerCertCN) |
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93 | |
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94 | except SSL.Checker.WrongHost, e: |
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95 | # Try match against peerCertDN set |
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96 | if peerCertDN != self.peerCertDN: |
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97 | raise e |
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98 | |
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99 | # At least one match should be found in the list - first convert to |
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100 | # NDG X500DN type to allow per field matching for DN comparison |
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101 | peerCertX500DN = X500DN(dn=peerCertDN) |
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102 | |
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103 | if self.acceptedDNs: |
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104 | matchFound = False |
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105 | for dn in self.acceptedDNs: |
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106 | x500dn = X500DN(dn=dn) |
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107 | if x500dn == peerCertX500DN: |
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108 | matchFound = True |
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109 | break |
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110 | |
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111 | if not matchFound: |
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112 | raise InvalidCertDN('Peer cert DN "%s" doesn\'t match ' |
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113 | 'verification list' % peerCertDN) |
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114 | |
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115 | if len(self.__caCertStack) > 0: |
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116 | try: |
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117 | self.__caCertStack.verifyCertChain( |
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118 | x509Cert2Verify=X509Cert(m2CryptoX509=peerCert)) |
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119 | except Exception, e: |
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120 | raise InvalidCertSignature("Peer certificate verification " |
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121 | "against CA certificate failed: %s" |
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122 | % e) |
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123 | |
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124 | # They match - drop the exception and return all OK instead |
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125 | return True |
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126 | |
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127 | def __setCACertList(self, caCertList): |
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128 | """Set list of CA certs - peer cert must validate against at least one |
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129 | of these""" |
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130 | self.__caCertStack = X509Stack() |
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131 | for caCert in caCertList: |
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132 | self.__caCertStack.push(caCert) |
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133 | |
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134 | caCertList = property(fset=__setCACertList, |
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135 | doc="list of CA certificates - the peer certificate " |
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136 | "must validate against one") |
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137 | |
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138 | def __setCACertsFromFileList(self, caCertFilePathList): |
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139 | '''Read CA certificates from file and add them to the X.509 |
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140 | stack |
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141 | |
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142 | @type caCertFilePathList: basestring, list or tuple |
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143 | @param caCertFilePathList: list of file paths for CA certificates to |
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144 | be used to verify certificate used to sign message. If a single |
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145 | string item is input then this is converted into a tuple |
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146 | ''' |
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147 | if isinstance(caCertFilePathList, basestring): |
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148 | caCertFilePathList = (caCertFilePathList,) |
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149 | |
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150 | elif not isinstance(caCertFilePathList, (list, tuple)): |
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151 | raise TypeError('Expecting a basestring, list or tuple type for ' |
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152 | '"caCertFilePathList"') |
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153 | |
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154 | self.__caCertStack = X509Stack() |
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155 | |
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156 | for caCertFilePath in caCertFilePathList: |
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157 | self.__caCertStack.push(X509.load_cert(caCertFilePath)) |
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158 | |
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159 | caCertFilePathList = property(fset=__setCACertsFromFileList, |
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160 | doc="list of CA certificate file paths - " |
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161 | "peer certificate must validate against " |
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162 | "one") |
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163 | |
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164 | |
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165 | class HTTPSConnection(_HTTPSConnection): |
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166 | """Modified version of M2Crypto equivalent to enable custom checks with |
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167 | the peer and timeout settings |
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168 | |
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169 | @type defReadTimeout: M2Crypto.SSL.timeout |
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170 | @cvar defReadTimeout: default timeout for read operations |
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171 | @type defWriteTimeout: M2Crypto.SSL.timeout |
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172 | @cvar defWriteTimeout: default timeout for write operations""" |
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173 | defReadTimeout = SSL.timeout(sec=20.) |
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174 | defWriteTimeout = SSL.timeout(sec=20.) |
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175 | |
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176 | def __init__(self, *args, **kw): |
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177 | '''Overload to enable setting of post connection check |
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178 | callback to SSL.Connection |
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179 | |
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180 | type *args: tuple |
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181 | param *args: args which apply to M2Crypto.httpslib.HTTPSConnection |
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182 | type **kw: dict |
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183 | param **kw: additional keywords |
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184 | @type postConnectionCheck: SSL.Checker.Checker derivative |
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185 | @keyword postConnectionCheck: set class for checking peer |
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186 | @type readTimeout: M2Crypto.SSL.timeout |
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187 | @keyword readTimeout: readTimeout - set timeout for read |
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188 | @type writeTimeout: M2Crypto.SSL.timeout |
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189 | @keyword writeTimeout: similar to read timeout''' |
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190 | |
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191 | self._postConnectionCheck = kw.pop('postConnectionCheck', |
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192 | SSL.Checker.Checker) |
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193 | |
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194 | if 'readTimeout' in kw: |
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195 | if not isinstance(kw['readTimeout'], SSL.timeout): |
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196 | raise AttributeError("readTimeout must be of type " |
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197 | "M2Crypto.SSL.timeout") |
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198 | self.readTimeout = kw.pop('readTimeout') |
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199 | else: |
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200 | self.readTimeout = HTTPSConnection.defReadTimeout |
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201 | |
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202 | if 'writeTimeout' in kw: |
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203 | if not isinstance(kw['writeTimeout'], SSL.timeout): |
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204 | raise AttributeError("writeTimeout must be of type " |
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205 | "M2Crypto.SSL.timeout") |
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206 | self.writeTimeout = kw.pop('writeTimeout') |
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207 | else: |
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208 | self.writeTimeout = HTTPSConnection.defWriteTimeout |
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209 | |
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210 | self._clntCertFilePath = kw.pop('clntCertFilePath', None) |
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211 | self._clntPriKeyFilePath = kw.pop('clntPriKeyFilePath', None) |
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212 | |
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213 | _HTTPSConnection.__init__(self, *args, **kw) |
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214 | |
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215 | # load up certificate stuff |
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216 | if (self._clntCertFilePath is not None and |
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217 | self._clntPriKeyFilePath is not None): |
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218 | self.ssl_ctx.load_cert(self._clntCertFilePath, |
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219 | self._clntPriKeyFilePath) |
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220 | |
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221 | |
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222 | def connect(self): |
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223 | '''Overload M2Crypto.httpslib.HTTPSConnection to enable |
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224 | custom post connection check of peer certificate and socket timeout''' |
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225 | |
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226 | self.sock = SSL.Connection(self.ssl_ctx) |
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227 | self.sock.set_post_connection_check_callback(self._postConnectionCheck) |
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228 | |
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229 | self.sock.set_socket_read_timeout(self.readTimeout) |
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230 | self.sock.set_socket_write_timeout(self.writeTimeout) |
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231 | |
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232 | self.sock.connect((self.host, self.port)) |
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233 | |
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234 | def putrequest(self, method, url, **kw): |
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235 | '''Overload to work around bug with unicode type URL''' |
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236 | url = str(url) |
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237 | _HTTPSConnection.putrequest(self, method, url, **kw) |
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238 | |
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239 | |
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240 | class SSLContextProxy(object): |
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241 | """Holder for M2Crypto.SSL.Context parameters""" |
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242 | PRE_VERIFY_FAIL, PRE_VERIFY_OK = range(2) |
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243 | |
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244 | SSL_CERT_FILEPATH_OPTNAME = "sslCertFilePath" |
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245 | SSL_PRIKEY_FILEPATH_OPTNAME = "sslPriKeyFilePath" |
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246 | SSL_PRIKEY_PWD_OPTNAME = "sslPriKeyPwd" |
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247 | SSL_CACERT_FILEPATH_OPTNAME = "sslCACertFilePath" |
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248 | SSL_CACERT_DIRPATH_OPTNAME = "sslCACertDir" |
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249 | SSL_VALID_DNS_OPTNAME = "sslValidDNs" |
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250 | |
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251 | OPTNAMES = ( |
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252 | SSL_CERT_FILEPATH_OPTNAME, |
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253 | SSL_PRIKEY_FILEPATH_OPTNAME, |
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254 | SSL_PRIKEY_PWD_OPTNAME, |
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255 | SSL_CACERT_FILEPATH_OPTNAME, |
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256 | SSL_CACERT_DIRPATH_OPTNAME, |
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257 | SSL_VALID_DNS_OPTNAME |
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258 | ) |
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259 | |
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260 | __slots__ = OPTNAMES |
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261 | __slots__ += tuple(["_SSLContextProxy__%s" % name for name in __slots__]) |
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262 | del name |
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263 | |
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264 | VALID_DNS_PAT = re.compile(',\s*') |
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265 | |
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266 | def __init__(self): |
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267 | self.__sslCertFilePath = None |
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268 | self.__sslPriKeyFilePath = None |
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269 | self.__sslPriKeyPwd = None |
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270 | self.__sslCACertFilePath = None |
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271 | self.__sslCACertDir = None |
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272 | self.__sslValidDNs = [] |
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273 | |
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274 | def createCtx(self, **kw): |
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275 | """Create an M2Crypto SSL Context from this objects properties |
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276 | @rtype: M2Crypto.SSL.Context |
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277 | @return M2Crypto SSL context object |
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278 | """ |
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279 | ctx = SSL.Context(**kw) |
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280 | if self.sslCertFilePath and self.sslPriKeyFilePath: |
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281 | ctx.load_cert(self.sslCertFilePath, |
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282 | self.__sslPriKeyFilePath, |
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283 | lambda *arg, **kw: self.sslPriKeyPwd) |
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284 | |
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285 | if self.sslCACertFilePath or self.sslCACertDir: |
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286 | ctx.load_verify_locations(self.sslCACertFilePath, |
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287 | self.sslCACertDir) |
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288 | |
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289 | ctx.set_verify(SSL.verify_peer|SSL.verify_fail_if_no_peer_cert, 9, |
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290 | callback=self.createVerifySSLPeerCertCallback()) |
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291 | |
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292 | return ctx |
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293 | |
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294 | def copy(self, sslCtxProxy): |
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295 | """Copy settings from another context object |
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296 | """ |
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297 | if not isinstance(sslCtxProxy, SSLContextProxy): |
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298 | raise TypeError('Expecting %r for copy method input object; ' |
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299 | 'got %r' % (SSLContextProxy, type(sslCtxProxy))) |
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300 | |
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301 | for name in SSLContextProxy.OPTNAMES: |
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302 | setattr(self, name, getattr(sslCtxProxy, name)) |
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303 | |
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304 | def createVerifySSLPeerCertCallback(self): |
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305 | """Create a callback function to enable the DN of the peer in an SSL |
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306 | connection to be verified against a whitelist. |
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307 | |
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308 | Nb. Making this function within the scope of a method of the class to |
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309 | enables to access instance variables |
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310 | """ |
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311 | |
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312 | def _verifySSLPeerCertCallback(preVerifyOK, x509StoreCtx): |
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313 | '''SSL verify callback function used to control the behaviour when |
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314 | the SSL_VERIFY_PEER flag is set. See: |
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315 | |
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316 | http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html |
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317 | |
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318 | This implementation applies verification in order to check the DN |
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319 | of the peer certificate against a whitelist |
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320 | |
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321 | @type preVerifyOK: int |
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322 | @param preVerifyOK: If a verification error is found, this |
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323 | parameter will be set to 0 |
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324 | @type x509StoreCtx: M2Crypto.X509.X509_Store_Context |
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325 | @param x509StoreCtx: locate the certificate to be verified and |
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326 | perform additional verification steps as needed |
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327 | @rtype: int |
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328 | @return: controls the strategy of the further verification process. |
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329 | - If verify_callback returns 0, the verification process is |
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330 | immediately stopped with "verification failed" state. If |
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331 | SSL_VERIFY_PEER is set, a verification failure alert is sent to the |
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332 | peer and the TLS/SSL handshake is terminated. |
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333 | - If verify_callback returns 1, the verification process is |
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334 | continued. |
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335 | If verify_callback always returns 1, the TLS/SSL handshake will not |
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336 | be terminated with respect to verification failures and the |
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337 | connection |
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338 | will be established. The calling process can however retrieve the |
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339 | error code of the last verification error using |
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340 | SSL_get_verify_result or by maintaining its own error storage |
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341 | managed by verify_callback. |
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342 | ''' |
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343 | if preVerifyOK == 0: |
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344 | # Something is wrong with the certificate don't bother |
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345 | # proceeding any further |
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346 | log.error("verifyCallback: pre-verify OK flagged an error " |
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347 | "with the peer certificate, returning error state " |
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348 | "to caller ...") |
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349 | return preVerifyOK |
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350 | |
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351 | x509CertChain = x509StoreCtx.get1_chain() |
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352 | for cert in x509CertChain: |
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353 | x509Cert = X509Cert.fromM2Crypto(cert) |
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354 | if x509Cert.dn in self.sslValidDNs: |
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355 | return preVerifyOK |
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356 | |
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357 | subject = cert.get_subject() |
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358 | dn = subject.as_text() |
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359 | log.debug("verifyCallback: dn = %r", dn) |
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360 | |
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361 | # No match found so return fail status |
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362 | return SSLContextProxy.PRE_VERIFY_FAIL |
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363 | |
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364 | return _verifySSLPeerCertCallback |
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365 | |
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366 | def _getSSLCertFilePath(self): |
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367 | return self.__sslCertFilePath |
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368 | |
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369 | def _setSSLCertFilePath(self, filePath): |
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370 | "Set X.509 cert file path property method" |
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371 | |
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372 | if isinstance(filePath, basestring): |
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373 | filePath = os.path.expandvars(filePath) |
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374 | |
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375 | elif filePath is not None: |
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376 | raise TypeError("X.509 cert. file path must be a valid string") |
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377 | |
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378 | self.__sslCertFilePath = filePath |
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379 | |
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380 | sslCertFilePath = property(fset=_setSSLCertFilePath, |
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381 | fget=_getSSLCertFilePath, |
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382 | doc="File path to X.509 cert.") |
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383 | |
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384 | def _getSSLCACertFilePath(self): |
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385 | """Get file path for list of CA cert or certs used to validate SSL |
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386 | connections |
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387 | |
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388 | @rtype sslCACertFilePath: basestring |
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389 | @return sslCACertFilePathList: file path to file containing concatenated |
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390 | PEM encoded CA certificates.""" |
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391 | return self.__sslCACertFilePath |
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392 | |
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393 | def _setSSLCACertFilePath(self, value): |
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394 | """Set CA cert file path |
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395 | |
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396 | @type sslCACertFilePath: basestring, list, tuple or None |
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397 | @param sslCACertFilePath: file path to CA certificate file. If None |
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398 | then the input is quietly ignored.""" |
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399 | if isinstance(value, basestring): |
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400 | self.__sslCACertFilePath = os.path.expandvars(value) |
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401 | |
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402 | elif value is None: |
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403 | self.__sslCACertFilePath = value |
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404 | |
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405 | else: |
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406 | raise TypeError("Input CA Certificate file path must be " |
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407 | "a valid string or None type: %r" % type(value)) |
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408 | |
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409 | |
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410 | sslCACertFilePath = property(fget=_getSSLCACertFilePath, |
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411 | fset=_setSSLCACertFilePath, |
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412 | doc="Path to file containing concatenated PEM " |
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413 | "encoded CA Certificates - used for " |
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414 | "verification of peer certs in SSL " |
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415 | "connection") |
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416 | |
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417 | def _getSSLCACertDir(self): |
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418 | """Get file path for list of CA cert or certs used to validate SSL |
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419 | connections |
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420 | |
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421 | @rtype sslCACertDir: basestring |
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422 | @return sslCACertDirList: directory containing PEM encoded CA |
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423 | certificates.""" |
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424 | return self.__sslCACertDir |
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425 | |
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426 | def _setSSLCACertDir(self, value): |
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427 | """Set CA cert or certs to validate AC signatures, signatures |
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428 | of Attribute Authority SOAP responses and SSL connections where |
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429 | AA SOAP service is run over SSL. |
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430 | |
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431 | @type sslCACertDir: basestring |
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432 | @param sslCACertDir: directory containing CA certificate files. |
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433 | """ |
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434 | if isinstance(value, basestring): |
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435 | self.__sslCACertDir = os.path.expandvars(value) |
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436 | elif value is None: |
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437 | self.__sslCACertDir = value |
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438 | else: |
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439 | raise TypeError("Input CA Certificate directroy must be " |
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440 | "a valid string or None type: %r" % type(value)) |
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441 | |
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442 | sslCACertDir = property(fget=_getSSLCACertDir, |
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443 | fset=_setSSLCACertDir, |
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444 | doc="Path to directory containing PEM encoded CA " |
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445 | "Certificates used for verification of peer " |
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446 | "certs in SSL connection. Files in the " |
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447 | "directory must be named with the form " |
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448 | "<hash>.0 where <hash> can be obtained using " |
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449 | "openssl x509 -in cert -hash -noout or using " |
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450 | "the c_rehash OpenSSL script") |
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451 | |
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452 | def _getSslValidDNs(self): |
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453 | return self.__sslValidDNs |
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454 | |
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455 | def _setSslValidDNs(self, value): |
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456 | if isinstance(value, basestring): |
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457 | pat = SSLContextProxy.VALID_DNS_PAT |
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458 | self.__sslValidDNs = [X500DN.fromString(dn) |
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459 | for dn in pat.split(value)] |
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460 | |
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461 | elif isinstance(value, (tuple, list)): |
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462 | self.__sslValidDNs = [X500DN.fromString(dn) for dn in value] |
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463 | else: |
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464 | raise TypeError('Expecting list/tuple or basestring type for "%s" ' |
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465 | 'attribute; got %r' % |
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466 | (SSLContextProxy.SSL_VALID_DNS_OPTNAME, |
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467 | type(value))) |
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468 | |
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469 | sslValidDNs = property(_getSslValidDNs, |
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470 | _setSslValidDNs, |
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471 | doc="whitelist of acceptable certificate " |
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472 | "Distinguished Names for peer certificates in " |
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473 | "SSL requests") |
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474 | |
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475 | def _getSSLPriKeyFilePath(self): |
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476 | return self.__sslPriKeyFilePath |
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477 | |
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478 | def _setSSLPriKeyFilePath(self, filePath): |
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479 | "Set ssl private key file path property method" |
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480 | |
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481 | if isinstance(filePath, basestring): |
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482 | filePath = os.path.expandvars(filePath) |
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483 | |
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484 | elif filePath is not None: |
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485 | raise TypeError("Private key file path must be a valid " |
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486 | "string or None type") |
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487 | |
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488 | self.__sslPriKeyFilePath = filePath |
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489 | |
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490 | sslPriKeyFilePath = property(fget=_getSSLPriKeyFilePath, |
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491 | fset=_setSSLPriKeyFilePath, |
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492 | doc="File path to SSL private key") |
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493 | |
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494 | def _setSSLPriKeyPwd(self, sslPriKeyPwd): |
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495 | "Set method for ssl private key file password" |
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496 | if not isinstance(sslPriKeyPwd, (type(None), basestring)): |
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497 | raise TypeError("Signing private key password must be None " |
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498 | "or a valid string") |
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499 | |
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500 | # Explicitly convert to string as M2Crypto OpenSSL wrapper fails with |
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501 | # unicode type |
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502 | self.__sslPriKeyPwd = str(sslPriKeyPwd) |
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503 | |
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504 | def _getSSLPriKeyPwd(self): |
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505 | "Get property method for SSL private key" |
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506 | return self.__sslPriKeyPwd |
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507 | |
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508 | sslPriKeyPwd = property(fset=_setSSLPriKeyPwd, |
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509 | fget=_getSSLPriKeyPwd, |
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510 | doc="Password protecting SSL private key file") |
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511 | |
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512 | def __getstate__(self): |
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513 | '''Enable pickling for use with beaker.session''' |
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514 | return dict([(attrName, getattr(self, attrName)) |
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515 | for attrName in self.__class__.__slots__]) |
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516 | |
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517 | def __setstate__(self, attrDict): |
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518 | '''Enable pickling for use with beaker.session''' |
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519 | for attr, val in attrDict.items(): |
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520 | setattr(self, attr, val) |
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