1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security.tls.authz;
import com.yahoo.security.SubjectAlternativeName;
import com.yahoo.security.X509CertificateUtils;
import com.yahoo.security.tls.policy.AuthorizedPeers;
import com.yahoo.security.tls.policy.CapabilitySet;
import com.yahoo.security.tls.policy.PeerPolicy;
import com.yahoo.security.tls.policy.RequiredPeerCredential;
import java.security.cert.X509Certificate;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Logger;
import static com.yahoo.security.SubjectAlternativeName.Type.DNS_NAME;
import static com.yahoo.security.SubjectAlternativeName.Type.IP_ADDRESS;
import static com.yahoo.security.SubjectAlternativeName.Type.UNIFORM_RESOURCE_IDENTIFIER;
import static java.util.stream.Collectors.toList;
/**
* Uses rules from {@link AuthorizedPeers} to evaluate X509 certificates
*
* @author bjorncs
*/
public class PeerAuthorizer {
private static final Logger log = Logger.getLogger(PeerAuthorizer.class.getName());
private final AuthorizedPeers authorizedPeers;
public PeerAuthorizer(AuthorizedPeers authorizedPeers) {
this.authorizedPeers = authorizedPeers;
}
public ConnectionAuthContext authorizePeer(X509Certificate cert) { return authorizePeer(List.of(cert)); }
public ConnectionAuthContext authorizePeer(List<X509Certificate> certChain) {
if (authorizedPeers.isEmpty()) {
return new ConnectionAuthContext(certChain, CapabilitySet.all(), Set.of());
}
X509Certificate cert = certChain.get(0);
Set<String> matchedPolicies = new HashSet<>();
Set<CapabilitySet> grantedCapabilities = new HashSet<>();
String cn = getCommonName(cert).orElse(null);
List<String> sans = getSubjectAlternativeNames(cert);
log.fine(() -> String.format("Subject info from x509 certificate: CN=[%s], 'SAN=%s", cn, sans));
for (PeerPolicy peerPolicy : authorizedPeers.peerPolicies()) {
if (matchesPolicy(peerPolicy, cn, sans)) {
matchedPolicies.add(peerPolicy.policyName());
grantedCapabilities.add(peerPolicy.capabilities());
}
}
return new ConnectionAuthContext(certChain, CapabilitySet.unionOf(grantedCapabilities), matchedPolicies);
}
private static boolean matchesPolicy(PeerPolicy peerPolicy, String cn, List<String> sans) {
return peerPolicy.requiredCredentials().stream()
.allMatch(requiredCredential -> matchesRequiredCredentials(requiredCredential, cn, sans));
}
private static boolean matchesRequiredCredentials(RequiredPeerCredential requiredCredential, String cn, List<String> sans) {
switch (requiredCredential.field()) {
case CN:
return cn != null && requiredCredential.pattern().matches(cn);
case SAN_DNS:
case SAN_URI:
return sans.stream()
.anyMatch(san -> requiredCredential.pattern().matches(san));
default:
throw new RuntimeException("Unknown field: " + requiredCredential.field());
}
}
private static Optional<String> getCommonName(X509Certificate peerCertificate) {
return X509CertificateUtils.getSubjectCommonNames(peerCertificate).stream()
.findFirst();
}
private static List<String> getSubjectAlternativeNames(X509Certificate peerCertificate) {
return X509CertificateUtils.getSubjectAlternativeNames(peerCertificate).stream()
.filter(san -> san.getType() == DNS_NAME || san.getType() == IP_ADDRESS || san.getType() == UNIFORM_RESOURCE_IDENTIFIER)
.map(SubjectAlternativeName::getValue)
.collect(toList());
}
}
|
