| commit | author | age | ||
| ea8e18 | 1 | // |
| L | 2 | // MQTTSSLSecurityPolicy.h |
| 3 | // MQTTClient.framework | |
| 4 | // | |
| 5 | // Created by @bobwenx on 15/6/1. | |
| 6 | // | |
| 7 | // based on | |
| 8 | // | |
| 9 | // Copyright (c) 2011–2015 AFNetwork (http://alamofire.org/) | |
| 10 | // | |
| 11 | // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 12 | // of this software and associated documentation files (the "Software"), to deal | |
| 13 | // in the Software without restriction, including without limitation the rights | |
| 14 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| 15 | // copies of the Software, and to permit persons to whom the Software is | |
| 16 | // furnished to do so, subject to the following conditions: | |
| 17 | // | |
| 18 | // The above copyright notice and this permission notice shall be included in | |
| 19 | // all copies or substantial portions of the Software. | |
| 20 | // | |
| 21 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 22 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 23 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 24 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 25 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 26 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| 27 | // THE SOFTWARE. | |
| 28 | ||
| 29 | #import <Foundation/Foundation.h> | |
| 30 | #import <Security/Security.h> | |
| 31 | ||
| 32 | /** | |
| 33 | ## SSL Pinning Modes | |
| 34 | ||
| 35 | The following constants are provided by `MQTTSSLPinningModeNone` as possible SSL pinning modes. | |
| 36 | ||
| 37 | enum { | |
| 38 | MQTTSSLPinningModeNone, | |
| 39 | MQTTSSLPinningModePublicKey, | |
| 40 | MQTTSSLPinningModeCertificate, | |
| 41 | } | |
| 42 | ||
| 43 | `MQTTSSLPinningModeNone` | |
| 44 | Do not used pinned certificates to validate servers. | |
| 45 | ||
| 46 | `MQTTSSLPinningModePublicKey` | |
| 47 | Validate host certificates against public keys of pinned certificates. | |
| 48 | ||
| 49 | `MQTTSSLPinningModeCertificate` | |
| 50 | Validate host certificates against pinned certificates. | |
| 51 | */ | |
| 52 | typedef NS_ENUM(NSUInteger, MQTTSSLPinningMode) { | |
| 53 | // Do not used pinned certificates to validate servers. | |
| 54 | MQTTSSLPinningModeNone, | |
| 55 | // Validate host certificates against public keys of pinned certificates. | |
| 56 | MQTTSSLPinningModePublicKey, | |
| 57 | // Validate host certificates against pinned certificates. | |
| 58 | MQTTSSLPinningModeCertificate, | |
| 59 | }; | |
| 60 | ||
| 61 | /** | |
| 62 | `MQTTSSLSecurityPolicy` evaluates server trust against pinned X.509 certificates and public keys over secure connections. | |
| 63 | ||
| 64 | If your app using security model which require pinning SSL certificates to helps prevent man-in-the-middle attacks | |
| 65 | and other vulnerabilities. you need to set securityPolicy to properly value(see MQTTSSLSecurityPolicy.h for more detail). | |
| 66 | ||
| 67 | NOTE: about self-signed server certificates: | |
| 68 | if your server using Self-signed certificates to establish SSL/TLS connection, you need to set property: | |
| 69 | MQTTSSLSecurityPolicy.allowInvalidCertificates=YES. | |
| 70 | ||
| 71 | If SSL is enabled, by default it only evaluate server's certificates using CA infrastructure, and for most case, this type of check is enough. | |
| 72 | However, if your app using security model which require pinning SSL certificates to helps prevent man-in-the-middle attacks | |
| 73 | and other vulnerabilities. you may need to set securityPolicy to properly value(see MQTTSSLSecurityPolicy.h for more detail). | |
| 74 | ||
| 75 | NOTE: about self-signed server certificates: | |
| 76 | In CA infrastructure, you may establish a SSL/TLS connection with server which using self-signed certificates | |
| 77 | by install the certificates into OS keychain(either programmatically or manually). however, this method has some disadvantages: | |
| 78 | 1. every socket you app created will trust certificates you added. | |
| 79 | 2. if user choice to remove certificates from keychain, you app need to handling certificates re-adding. | |
| 80 | ||
| 81 | If you only want to verify the cert for the socket you are creating and for no other sockets in your app, you need to use | |
| 82 | MQTTSSLSecurityPolicy. | |
| 83 | And if you use self-signed server certificates, your need to set property: MQTTSSLSecurityPolicy.allowInvalidCertificates=YES | |
| 84 | ||
| 85 | Adding pinned SSL certificates to your app helps prevent man-in-the-middle attacks and other vulnerabilities. | |
| 86 | Applications dealing with sensitive customer data or financial information are strongly encouraged to route all communication | |
| 87 | over an SSL/TLS connection with SSL pinning configured and enabled. | |
| 88 | */ | |
| 89 | @interface MQTTSSLSecurityPolicy : NSObject | |
| 90 | /** | |
| 91 | The criteria by which server trust should be evaluated against the pinned SSL certificates. Defaults to `MQTTSSLPinningMode`. | |
| 92 | */ | |
| 93 | @property (readonly, nonatomic, assign) MQTTSSLPinningMode SSLPinningMode; | |
| 94 | ||
| 95 | /** | |
| 96 | Whether to evaluate an entire SSL certificate chain, or just the leaf certificate. Defaults to `YES`. | |
| 97 | */ | |
| 98 | @property (nonatomic, assign) BOOL validatesCertificateChain; | |
| 99 | ||
| 100 | /** | |
| 101 | The certificates used to evaluate server trust according to the SSL pinning mode. By default, this property is set to any (`.cer`) certificates included in the app bundle. | |
| 102 | Note: Array item type: NSData - Bytes of X.509 certificate file in der format. | |
| 103 | Note that if you create an array with duplicate certificates, the duplicate certificates will be removed. | |
| 104 | */ | |
| 105 | @property (nonatomic, strong) NSArray *pinnedCertificates; | |
| 106 | ||
| 107 | /** | |
| 108 | Whether or not to trust servers with an invalid or expired SSL certificates. Defaults to `NO`. | |
| 109 | Note: If your server-certificates are self signed, your should set this property to 'YES'. | |
| 110 | */ | |
| 111 | @property (nonatomic, assign) BOOL allowInvalidCertificates; | |
| 112 | ||
| 113 | /** | |
| 114 | Whether or not to validate the domain name in the certificate's CN field. Defaults to `YES`. | |
| 115 | */ | |
| 116 | @property (nonatomic, assign) BOOL validatesDomainName; | |
| 117 | ||
| 118 | ///----------------------------------------- | |
| 119 | /// @name Getting Specific Security Policies | |
| 120 | ///----------------------------------------- | |
| 121 | ||
| 122 | /** | |
| 123 | Returns the shared default security policy, which does not allow invalid certificates, validates domain name, and does not validate against pinned certificates or public keys. | |
| 124 | ||
| 125 | @return The default security policy. | |
| 126 | */ | |
| 127 | + (instancetype)defaultPolicy; | |
| 128 | ||
| 129 | ///--------------------- | |
| 130 | /// @name Initialization | |
| 131 | ///--------------------- | |
| 132 | ||
| 133 | /** | |
| 134 | Creates and returns a security policy with the specified pinning mode. | |
| 135 | ||
| 136 | @param pinningMode The SSL pinning mode. | |
| 137 | ||
| 138 | @return A new security policy. | |
| 139 | */ | |
| 140 | + (instancetype)policyWithPinningMode:(MQTTSSLPinningMode)pinningMode; | |
| 141 | ||
| 142 | ///------------------------------ | |
| 143 | /// @name Evaluating Server Trust | |
| 144 | ///------------------------------ | |
| 145 | ||
| 146 | /** | |
| 147 | Whether or not the specified server trust should be accepted, based on the security policy. | |
| 148 | ||
| 149 | This method should be used when responding to an authentication challenge from a server. | |
| 150 | ||
| 151 | @param serverTrust The X.509 certificate trust of the server. | |
| 152 | @param domain The domain of serverTrust. If `nil`, the domain will not be validated. | |
| 153 | ||
| 154 | @return Whether or not to trust the server. | |
| 155 | */ | |
| 156 | - (BOOL)evaluateServerTrust:(SecTrustRef)serverTrust | |
| 157 | forDomain:(NSString *)domain; | |
| 158 | @end | |
