OSX/libsecurity_ssl/Security/SecureTransport.h

   1 /*
   2  * Copyright (c) 1999-2002,2005-2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * SecureTransport.h - Public API for Apple SSL/TLS Implementation
  26  */
  27
  28 #ifndef _SECURITY_SECURETRANSPORT_H_
  29 #define _SECURITY_SECURETRANSPORT_H_
  30
  31 /*
  32  * This file describes the public API for an implementation of the
  33  * Secure Socket Layer, V. 3.0, Transport Layer Security, V. 1.0 to V. 1.2
  34  * and Datagram Transport Layer Security V. 1.0
  35  *
  36  * There are no transport layer dependencies in this library;
  37  * it can be used with sockets, Open Transport, etc. Applications using
  38  * this library provide callback functions which do the actual I/O
  39  * on underlying network connections. Applications are also responsible
  40  * for setting up raw network connections; the application passes in
  41  * an opaque reference to the underlying (connected) entity at the
  42  * start of an SSL session in the form of an SSLConnectionRef.
  43  *
  44  * Some terminology:
  45  *
  46  * A "client" is the initiator of an SSL Session. The canonical example
  47  * of a client is a web browser, when it's talking to an https URL.
  48  *
  49  * A "server" is an entity which accepts requests for SSL sessions made
  50  * by clients. E.g., a secure web server.
  51
  52  * An "SSL Session", or "session", is bounded by calls to SSLHandshake()
  53  * and SSLClose(). An "Active session" is in some state between these
  54  * two calls, inclusive.
  55  *
  56  * An SSL Session Context, or SSLContextRef, is an opaque reference in this
  57  * library to the state associated with one session. A SSLContextRef cannot
  58  * be reused for multiple sessions.
  59  */
  60
  61 #include <CoreFoundation/CFArray.h>
  62 #include <Security/CipherSuite.h>
  63 #include <Security/SecTrust.h>
  64 #include <sys/types.h>
  65 #include <Availability.h>
  66
  67 #ifdef __cplusplus
  68 extern "C" {
  69 #endif
  70
  71 CF_ASSUME_NONNULL_BEGIN
  72 CF_IMPLICIT_BRIDGING_ENABLED
  73
  74 /***********************
  75  *** Common typedefs ***
  76  ***********************/
  77
  78 /* Opaque reference to an SSL session context */
  79 struct                      SSLContext;
  80 typedef struct CF_BRIDGED_TYPE(id) SSLContext *SSLContextRef;
  81
  82 /* Opaque reference to an I/O connection (socket, endpoint, etc.) */
  83 typedef const void *            SSLConnectionRef;
  84
  85 /* SSL Protocol version */
  86 typedef CF_ENUM(int, SSLProtocol) {
  87         kSSLProtocolUnknown = 0,                /* no protocol negotiated/specified; use default */
  88         kSSLProtocol3       = 2,                                /* SSL 3.0 */
  89         kTLSProtocol1       = 4,                                /* TLS 1.0 */
  90     kTLSProtocol11      = 7,                            /* TLS 1.1 */
  91     kTLSProtocol12      = 8,                            /* TLS 1.2 */
  92     kDTLSProtocol1      = 9,                /* DTLS 1.0 */
  93
  94     /* DEPRECATED on iOS */
  95     kSSLProtocol2       = 1,                            /* SSL 2.0 */
  96     kSSLProtocol3Only   = 3,                /* SSL 3.0 Only */
  97     kTLSProtocol1Only   = 5,                /* TLS 1.0 Only */
  98     kSSLProtocolAll     = 6,                /* All TLS supported protocols */
  99
 100 };
 101
 102 /* SSL session options */
 103 typedef CF_ENUM(int, SSLSessionOption) {
 104         /*
 105          * Set this option to enable returning from SSLHandshake (with a result of
 106          * errSSLServerAuthCompleted) when the server authentication portion of the
 107          * handshake is complete. This disable certificate verification and
 108          * provides an opportunity to perform application-specific server
 109          * verification before deciding to continue.
 110          */
 111         kSSLSessionOptionBreakOnServerAuth = 0,
 112         /*
 113          * Set this option to enable returning from SSLHandshake (with a result of
 114          * errSSLClientCertRequested) when the server requests a client certificate.
 115          */
 116         kSSLSessionOptionBreakOnCertRequested = 1,
 117     /*
 118      * This option is the same as kSSLSessionOptionBreakOnServerAuth but applies
 119      * to the case where SecureTransport is the server and the client has presented
 120      * its certificates allowing the server to verify whether these should be
 121      * allowed to authenticate.
 122      */
 123     kSSLSessionOptionBreakOnClientAuth = 2,
 124     /*
 125      * Enable/Disable TLS False Start
 126      * When enabled, False Start will only be performed if a adequate cipher-suite is
 127      * negotiated.
 128      */
 129     kSSLSessionOptionFalseStart = 3,
 130     /*
 131      * Enable/Disable 1/n-1 record splitting for BEAST attack mitigation.
 132      * When enabled, record splitting will only be performed for TLS 1.0 connections
 133      * using a block cipher.
 134      */
 135     kSSLSessionOptionSendOneByteRecord = 4,
 136     /*
 137      * Allow/Disallow server identity change on renegotiation. Disallow by default
 138      * to avoid Triple Handshake attack.
 139      */
 140     kSSLSessionOptionAllowServerIdentityChange = 5,
 141     /*
 142      * Enable fallback countermeasures. Use this option when retyring a SSL connection
 143      * with a lower protocol version because of failure to connect.
 144      */
 145     kSSLSessionOptionFallback = 6,
 146     /*
 147      * Set this option to break from a client hello in order to check for SNI
 148      */
 149     kSSLSessionOptionBreakOnClientHello = 7,
 150
 151 };
 152
 153 /* State of an SSLSession */
 154 typedef CF_ENUM(int, SSLSessionState) {
 155         kSSLIdle,                                       /* no I/O performed yet */
 156         kSSLHandshake,                          /* SSL handshake in progress */
 157         kSSLConnected,                          /* Handshake complete, ready for normal I/O */
 158         kSSLClosed,                                     /* connection closed normally */
 159         kSSLAborted                                     /* connection aborted */
 160 };
 161
 162 /*
 163  * Status of client certificate exchange (which is optional
 164  * for both server and client).
 165  */
 166 typedef CF_ENUM(int, SSLClientCertificateState) {
 167         /* Server hasn't asked for a cert. Client hasn't sent one. */
 168         kSSLClientCertNone,
 169         /* Server has asked for a cert, but client didn't send it. */
 170         kSSLClientCertRequested,
 171         /*
 172          * Server side: We asked for a cert, client sent one, we validated
 173          *                              it OK. App can inspect the cert via
 174          *                              SSLGetPeerCertificates().
 175          * Client side: server asked for one, we sent it.
 176          */
 177         kSSLClientCertSent,
 178         /*
 179          * Client sent a cert but failed validation. Server side only.
 180          * Server app can inspect the cert via SSLGetPeerCertificates().
 181          */
 182         kSSLClientCertRejected
 183 } ;
 184
 185 /*
 186  * R/W functions. The application using this library provides
 187  * these functions via SSLSetIOFuncs().
 188  *
 189  * Data's memory is allocated by caller; on entry to these two functions
 190  * the *length argument indicates both the size of the available data and the
 191  * requested byte count. Number of bytes actually transferred is returned in
 192  * *length.
 193  *
 194  * The application may configure the underlying connection to operate
 195  * in a non-blocking manner; in such a case, a read operation may
 196  * well return errSSLWouldBlock, indicating "I transferred less data than
 197  * you requested (maybe even zero bytes), nothing is wrong, except
 198  * requested I/O hasn't completed". This will be returned back up to
 199  * the application as a return from SSLRead(), SSLWrite(), SSLHandshake(),
 200  * etc.
 201  */
 202 typedef OSStatus
 203 (*SSLReadFunc)                          (SSLConnectionRef       connection,
 204                                                          void                           *data,                  /* owned by
 205                                                                                                                                  * caller, data
 206                                                                                                                                  * RETURNED */
 207                                                          size_t                         *dataLength);   /* IN/OUT */
 208 typedef OSStatus
 209 (*SSLWriteFunc)                         (SSLConnectionRef       connection,
 210                                                          const void             *data,
 211                                                          size_t                         *dataLength);   /* IN/OUT */
 212
 213 /*************************************************
 214  *** OSStatus values unique to SecureTransport ***
 215  *************************************************/
 216
 217 /*
 218     Note: the comments that appear after these errors are used to create SecErrorMessages.strings.
 219     The comments must not be multi-line, and should be in a form meaningful to an end user. If
 220     a different or additional comment is needed, it can be put in the header doc format, or on a
 221     line that does not start with errZZZ.
 222 */
 223
 224 CF_ENUM(OSStatus) {
 225         errSSLProtocol                          = -9800,        /* SSL protocol error */
 226         errSSLNegotiation                       = -9801,        /* Cipher Suite negotiation failure */
 227         errSSLFatalAlert                        = -9802,        /* Fatal alert */
 228         errSSLWouldBlock                        = -9803,        /* I/O would block (not fatal) */
 229     errSSLSessionNotFound               = -9804,        /* attempt to restore an unknown session */
 230     errSSLClosedGraceful                = -9805,        /* connection closed gracefully */
 231     errSSLClosedAbort                   = -9806,        /* connection closed via error */
 232     errSSLXCertChainInvalid     = -9807,        /* invalid certificate chain */
 233     errSSLBadCert                               = -9808,        /* bad certificate format */
 234         errSSLCrypto                            = -9809,        /* underlying cryptographic error */
 235         errSSLInternal                          = -9810,        /* Internal error */
 236         errSSLModuleAttach                      = -9811,        /* module attach failure */
 237     errSSLUnknownRootCert               = -9812,        /* valid cert chain, untrusted root */
 238     errSSLNoRootCert                    = -9813,        /* cert chain not verified by root */
 239         errSSLCertExpired                       = -9814,        /* chain had an expired cert */
 240         errSSLCertNotYetValid           = -9815,        /* chain had a cert not yet valid */
 241         errSSLClosedNoNotify            = -9816,        /* server closed session with no notification */
 242         errSSLBufferOverflow            = -9817,        /* insufficient buffer provided */
 243         errSSLBadCipherSuite            = -9818,        /* bad SSLCipherSuite */
 244
 245         /* fatal errors detected by peer */
 246         errSSLPeerUnexpectedMsg         = -9819,        /* unexpected message received */
 247         errSSLPeerBadRecordMac          = -9820,        /* bad MAC */
 248         errSSLPeerDecryptionFail        = -9821,        /* decryption failed */
 249         errSSLPeerRecordOverflow        = -9822,        /* record overflow */
 250         errSSLPeerDecompressFail        = -9823,        /* decompression failure */
 251         errSSLPeerHandshakeFail         = -9824,        /* handshake failure */
 252         errSSLPeerBadCert                       = -9825,        /* misc. bad certificate */
 253         errSSLPeerUnsupportedCert       = -9826,        /* bad unsupported cert format */
 254         errSSLPeerCertRevoked           = -9827,        /* certificate revoked */
 255         errSSLPeerCertExpired           = -9828,        /* certificate expired */
 256         errSSLPeerCertUnknown           = -9829,        /* unknown certificate */
 257         errSSLIllegalParam                      = -9830,        /* illegal parameter */
 258         errSSLPeerUnknownCA             = -9831,        /* unknown Cert Authority */
 259         errSSLPeerAccessDenied          = -9832,        /* access denied */
 260         errSSLPeerDecodeError           = -9833,        /* decoding error */
 261         errSSLPeerDecryptError          = -9834,        /* decryption error */
 262         errSSLPeerExportRestriction     = -9835,        /* export restriction */
 263         errSSLPeerProtocolVersion       = -9836,        /* bad protocol version */
 264         errSSLPeerInsufficientSecurity = -9837, /* insufficient security */
 265         errSSLPeerInternalError         = -9838,        /* internal error */
 266         errSSLPeerUserCancelled         = -9839,        /* user canceled */
 267         errSSLPeerNoRenegotiation       = -9840,        /* no renegotiation allowed */
 268
 269         /* non-fatal result codes */
 270         errSSLPeerAuthCompleted     = -9841,    /* peer cert is valid, or was ignored if verification disabled */
 271         errSSLClientCertRequested       = -9842,        /* server has requested a client cert */
 272
 273         /* more errors detected by us */
 274         errSSLHostNameMismatch          = -9843,        /* peer host name mismatch */
 275         errSSLConnectionRefused         = -9844,        /* peer dropped connection before responding */
 276         errSSLDecryptionFail            = -9845,        /* decryption failure */
 277         errSSLBadRecordMac                      = -9846,        /* bad MAC */
 278         errSSLRecordOverflow            = -9847,        /* record overflow */
 279         errSSLBadConfiguration          = -9848,        /* configuration error */
 280         errSSLUnexpectedRecord      = -9849,    /* unexpected (skipped) record in DTLS */
 281     errSSLWeakPeerEphemeralDHKey = -9850,       /* weak ephemeral dh key  */
 282
 283     /* non-fatal result codes */
 284     errSSLClientHelloReceived   = -9851,    /* SNI */
 285 };
 286
 287 /* DEPRECATED aliases for errSSLPeerAuthCompleted */
 288 #define errSSLServerAuthCompleted       errSSLPeerAuthCompleted
 289 #define errSSLClientAuthCompleted       errSSLPeerAuthCompleted
 290
 291 /* DEPRECATED alias for the end of the error range */
 292 #define errSSLLast errSSLUnexpectedRecord
 293
 294 typedef CF_ENUM(int, SSLProtocolSide)
 295 {
 296     kSSLServerSide,
 297     kSSLClientSide
 298 };
 299
 300 typedef CF_ENUM(int, SSLConnectionType)
 301 {
 302     kSSLStreamType,
 303     kSSLDatagramType
 304 };
 305
 306 typedef CF_ENUM(int, SSLSessionStrengthPolicy)
 307 {
 308     kSSLSessionStrengthPolicyDefault,
 309     kSSLSessionStrengthPolicyATSv1
 310 };
 311
 312 /******************
 313  *** Public API ***
 314  ******************/
 315
 316 /*
 317  * Secure Transport APIs require a SSLContextRef, which is an opaque
 318  * reference to the SSL session and its parameters. On Mac OS X 10.7
 319  * and earlier versions, a new context is created using SSLNewContext,
 320  * and is disposed by calling SSLDisposeContext.
 321  *
 322  * On i0S 5.0 and later, as well as Mac OS X versions after 10.7, the
 323  * SSLContextRef is a true CFType object with retain-release semantics.
 324  * New code should create a new context using SSLCreateContext (instead
 325  * of SSLNewContext), and dispose the context by calling CFRelease
 326  * (instead of SSLDisposeContext) when finished with it.
 327  */
 328
 329 /*
 330  * Return the CFTypeID for SSLContext objects.
 331  */
 332 CFTypeID
 333 SSLContextGetTypeID(void)
 334         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 335
 336 /*
 337  * Create a new instance of an SSLContextRef using the specified allocator.
 338  */
 339 __nullable
 340 SSLContextRef
 341 SSLCreateContext(CFAllocatorRef __nullable alloc, SSLProtocolSide protocolSide, SSLConnectionType connectionType)
 342         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 343
 344
 345 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 346 /*
 347  * Create a new session context.
 348  *
 349  * ==========================
 350  * MAC OS X ONLY (DEPRECATED)
 351  * ==========================
 352  * NOTE: this function is not available on iOS, and should be considered
 353  * deprecated on Mac OS X. Your code should use SSLCreateContext instead.
 354  */
 355 OSStatus
 356 SSLNewContext                           (Boolean                        isServer,
 357                                                          SSLContextRef          * __nonnull CF_RETURNS_RETAINED contextPtr)     /* RETURNED */
 358         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 359
 360 /*
 361  * Dispose of a session context.
 362  *
 363  * ==========================
 364  * MAC OS X ONLY (DEPRECATED)
 365  * ==========================
 366  * NOTE: this function is not available on iOS, and should be considered
 367  * deprecated on Mac OS X. Your code should use CFRelease to dispose a session
 368  * created with SSLCreateContext.
 369  */
 370 OSStatus
 371 SSLDisposeContext                       (SSLContextRef          context)
 372         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 373
 374 #endif /* MAC OS X */
 375
 376 /*
 377  * Determine the state of an SSL/DTLS session.
 378  */
 379 OSStatus
 380 SSLGetSessionState                      (SSLContextRef          context,
 381                                                          SSLSessionState        *state)         /* RETURNED */
 382         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 383
 384 /*
 385  * Set options for an SSL session. Must be called prior to SSLHandshake();
 386  * subsequently cannot be called while session is active.
 387  */
 388 OSStatus
 389 SSLSetSessionOption                     (SSLContextRef          context,
 390                                                          SSLSessionOption       option,
 391                                                          Boolean                        value)
 392         __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_5_0);
 393
 394 /*
 395  * Determine current value for the specified option in a given SSL session.
 396  */
 397 OSStatus
 398 SSLGetSessionOption                     (SSLContextRef          context,
 399                                                          SSLSessionOption       option,
 400                                                          Boolean                        *value)
 401         __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_5_0);
 402
 403 /********************************************************************
 404  *** Session context configuration, common to client and servers. ***
 405  ********************************************************************/
 406
 407 /*
 408  * Specify functions which do the network I/O. Must be called prior
 409  * to SSLHandshake(); subsequently cannot be called while a session is
 410  * active.
 411  */
 412 OSStatus
 413 SSLSetIOFuncs                           (SSLContextRef          context,
 414                                                          SSLReadFunc            readFunc,
 415                                                          SSLWriteFunc           writeFunc)
 416         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 417
 418 /*
 419  * Set the minimum SSL protocol version allowed. Optional.
 420  * The default is the lower supported protocol.
 421  *
 422  * This can only be called when no session is active.
 423  *
 424  * For TLS contexts, legal values for minVersion are :
 425  *              kSSLProtocol3
 426  *              kTLSProtocol1
 427  *              kTLSProtocol11
 428  *              kTLSProtocol12
 429  *
 430  * For DTLS contexts, legal values for minVersion are :
 431  *      kDTLSProtocol1
 432  */
 433 OSStatus
 434 SSLSetProtocolVersionMin  (SSLContextRef      context,
 435                            SSLProtocol        minVersion)
 436     __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 437
 438 /*
 439  * Get minimum protocol version allowed
 440  */
 441 OSStatus
 442 SSLGetProtocolVersionMin  (SSLContextRef      context,
 443                            SSLProtocol        *minVersion)
 444     __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 445
 446 /*
 447  * Set the maximum SSL protocol version allowed. Optional.
 448  * The default is the highest supported protocol.
 449  *
 450  * This can only be called when no session is active.
 451  *
 452  * For TLS contexts, legal values for minVersion are :
 453  *              kSSLProtocol3
 454  *              kTLSProtocol1
 455  *              kTLSProtocol11
 456  *              kTLSProtocol12
 457  *
 458  * For DTLS contexts, legal values for minVersion are :
 459  *      kDTLSProtocol1
 460  */
 461 OSStatus
 462 SSLSetProtocolVersionMax  (SSLContextRef      context,
 463                            SSLProtocol        maxVersion)
 464     __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 465
 466 /*
 467  * Get maximum protocol version allowed
 468  */
 469 OSStatus
 470 SSLGetProtocolVersionMax  (SSLContextRef      context,
 471                            SSLProtocol        *maxVersion)
 472     __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 473
 474
 475 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 476 /*
 477  * Set allowed SSL protocol versions. Optional.
 478  * Specifying kSSLProtocolAll for SSLSetProtocolVersionEnabled results in
 479  * specified 'enable' boolean to be applied to all supported protocols.
 480  * The default is "all supported protocols are enabled".
 481  * This can only be called when no session is active.
 482  *
 483  * Legal values for protocol are :
 484  *              kSSLProtocol2
 485  *              kSSLProtocol3
 486  *              kTLSProtocol1
 487  *              kSSLProtocolAll
 488  *
 489  * ==========================
 490  * MAC OS X ONLY (DEPRECATED)
 491  * ==========================
 492  * NOTE: this function is not available on iOS, and should be considered
 493  * deprecated on Mac OS X. You can use SSLSetProtocolVersionMin and/or
 494  * SSLSetProtocolVersionMax to specify which protocols are enabled.
 495  */
 496 OSStatus
 497 SSLSetProtocolVersionEnabled (SSLContextRef     context,
 498                                                          SSLProtocol            protocol,
 499                                                          Boolean                        enable)
 500         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 501
 502 /*
 503  * Obtain a value specified in SSLSetProtocolVersionEnabled.
 504  *
 505  * ==========================
 506  * MAC OS X ONLY (DEPRECATED)
 507  * ==========================
 508  * NOTE: this function is not available on iOS, and should be considered
 509  * deprecated on Mac OS X. You can use SSLGetProtocolVersionMin and/or
 510  * SSLGetProtocolVersionMax to check whether a protocol is enabled.
 511  */
 512 OSStatus
 513 SSLGetProtocolVersionEnabled(SSLContextRef              context,
 514                                                          SSLProtocol            protocol,
 515                                                          Boolean                        *enable)        /* RETURNED */
 516         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 517
 518 /*
 519  * Get/set SSL protocol version; optional. Default is kSSLProtocolUnknown,
 520  * in which case the highest possible version is attempted, but a lower
 521  * version is accepted if the peer requires it.
 522  * SSLSetProtocolVersion cannot be called when a session is active.
 523  *
 524  * ==========================
 525  * MAC OS X ONLY (DEPRECATED)
 526  * ==========================
 527  * NOTE: this function is not available on iOS, and deprecated on Mac OS X 10.8.
 528  * Use SSLSetProtocolVersionMin and/or SSLSetProtocolVersionMax to specify
 529  * which protocols are enabled.
 530  */
 531 OSStatus
 532 SSLSetProtocolVersion           (SSLContextRef          context,
 533                                                          SSLProtocol            version)
 534         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_8,__IPHONE_NA,__IPHONE_NA);
 535
 536 /*
 537  * Obtain the protocol version specified in SSLSetProtocolVersion.
 538  * If SSLSetProtocolVersionEnabled() has been called for this session,
 539  * SSLGetProtocolVersion() may return errSecParam if the protocol enable
 540  * state can not be represented by the SSLProtocol enums (e.g.,
 541  * SSL2 and TLS1 enabled, SSL3 disabled).
 542  *
 543  * ==========================
 544  * MAC OS X ONLY (DEPRECATED)
 545  * ==========================
 546  * NOTE: this function is not available on iOS, and deprecated on Mac OS X 10.8.
 547  * Use SSLGetProtocolVersionMin and/or SSLGetProtocolVersionMax to check
 548  * whether a protocol is enabled.
 549  */
 550 OSStatus
 551 SSLGetProtocolVersion           (SSLContextRef          context,
 552                                                          SSLProtocol            *protocol)      /* RETURNED */
 553         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_8,__IPHONE_NA,__IPHONE_NA);
 554
 555 #endif /* MAC OS X */
 556
 557 /*
 558  * Specify this connection's certificate(s). This is mandatory for
 559  * server connections, optional for clients. Specifying a certificate
 560  * for a client enables SSL client-side authentication. The end-entity
 561  * cert is in certRefs[0]. Specifying a root cert is optional; if it's
 562  * not specified, the root cert which verifies the cert chain specified
 563  * here must be present in the system-wide set of trusted anchor certs.
 564  *
 565  * The certRefs argument is a CFArray containing SecCertificateRefs,
 566  * except for certRefs[0], which is a SecIdentityRef.
 567  *
 568  * Must be called prior to SSLHandshake(), or immediately after
 569  * SSLHandshake has returned errSSLClientCertRequested (i.e. before the
 570  * handshake is resumed by calling SSLHandshake again.)
 571  *
 572  * SecureTransport assumes the following:
 573  *
 574  *  -- The certRef references remain valid for the lifetime of the session.
 575  *  -- The certificate specified in certRefs[0] is capable of signing.
 576  *  -- The required capabilities of the certRef[0], and of the optional cert
 577  *     specified in SSLSetEncryptionCertificate (see below), are highly
 578  *     dependent on the application. For example, to work as a server with
 579  *     Netscape clients, the cert specified here must be capable of both
 580  *     signing and encrypting.
 581  */
 582 OSStatus
 583 SSLSetCertificate                       (SSLContextRef          context,
 584                                                          CFArrayRef                     certRefs)
 585         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 586
 587 /*
 588  * Specify I/O connection - a socket, endpoint, etc., which is
 589  * managed by caller. On the client side, it's assumed that communication
 590  * has been established with the desired server on this connection.
 591  * On the server side, it's assumed that an incoming client request
 592  * has been established.
 593  *
 594  * Must be called prior to SSLHandshake(); subsequently can only be
 595  * called when no session is active.
 596  */
 597 OSStatus
 598 SSLSetConnection                        (SSLContextRef                  context,
 599                                                          SSLConnectionRef __nullable    connection)
 600         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 601
 602 OSStatus
 603 SSLGetConnection                        (SSLContextRef          context,
 604                                                          SSLConnectionRef       * __nonnull CF_RETURNS_NOT_RETAINED connection)
 605         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 606
 607 /*
 608  * Specify the fully qualified doman name of the peer, e.g., "store.apple.com."
 609  * Optional; used to verify the common name field in peer's certificate.
 610  * Name is in the form of a C string; NULL termination optional, i.e.,
 611  * peerName[peerNameLen+1] may or may not have a NULL. In any case peerNameLen
 612  * is the number of bytes of the peer domain name.
 613  */
 614 OSStatus
 615 SSLSetPeerDomainName            (SSLContextRef          context,
 616                                                          const char                     * __nullable peerName,
 617                                                          size_t                         peerNameLen)
 618         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 619
 620 /*
 621  * Determine the buffer size needed for SSLGetPeerDomainName().
 622  */
 623 OSStatus
 624 SSLGetPeerDomainNameLength      (SSLContextRef          context,
 625                                                          size_t                         *peerNameLen)   // RETURNED
 626         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 627
 628 /*
 629  * Obtain the value specified in SSLSetPeerDomainName().
 630  */
 631 OSStatus
 632 SSLGetPeerDomainName            (SSLContextRef          context,
 633                                                          char                           *peerName,              // returned here
 634                                                          size_t                         *peerNameLen)   // IN/OUT
 635         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 636
 637 /*
 638  * Specify the Datagram TLS Hello Cookie.
 639  * This is to be called for server side only and is optional.
 640  * The default is a zero len cookie. The maximum cookieLen is 32 bytes.
 641  */
 642 OSStatus
 643 SSLSetDatagramHelloCookie       (SSLContextRef          dtlsContext,
 644                              const void         * __nullable cookie,
 645                              size_t             cookieLen)
 646         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 647
 648 /*
 649  * Specify the maximum record size, including all DTLS record headers.
 650  * This should be set appropriately to avoid fragmentation
 651  * of Datagrams during handshake, as fragmented datagrams may
 652  * be dropped by some network.
 653  * This is for Datagram TLS only
 654  */
 655 OSStatus
 656 SSLSetMaxDatagramRecordSize (SSLContextRef              dtlsContext,
 657                              size_t             maxSize)
 658         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 659
 660 /*
 661  * Get the maximum record size, including all Datagram TLS record headers.
 662  * This is for Datagram TLS only
 663  */
 664 OSStatus
 665 SSLGetMaxDatagramRecordSize (SSLContextRef              dtlsContext,
 666                              size_t             *maxSize)
 667         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
 668
 669 /*
 670  * Obtain the actual negotiated protocol version of the active
 671  * session, which may be different that the value specified in
 672  * SSLSetProtocolVersion(). Returns kSSLProtocolUnknown if no
 673  * SSL session is in progress.
 674  */
 675 OSStatus
 676 SSLGetNegotiatedProtocolVersion         (SSLContextRef          context,
 677                                                                          SSLProtocol            *protocol)      /* RETURNED */
 678         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 679
 680 /*
 681  * Determine number and values of all of the SSLCipherSuites we support.
 682  * Caller allocates output buffer for SSLGetSupportedCiphers() and passes in
 683  * its size in *numCiphers. If supplied buffer is too small, errSSLBufferOverflow
 684  * will be returned.
 685  */
 686 OSStatus
 687 SSLGetNumberSupportedCiphers (SSLContextRef                     context,
 688                                                           size_t                                *numCiphers)
 689         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 690
 691 OSStatus
 692 SSLGetSupportedCiphers           (SSLContextRef                 context,
 693                                                           SSLCipherSuite                *ciphers,               /* RETURNED */
 694                                                           size_t                                *numCiphers)    /* IN/OUT */
 695         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 696
 697 /*
 698  * Specify a (typically) restricted set of SSLCipherSuites to be enabled by
 699  * the current SSLContext. Can only be called when no session is active. Default
 700  * set of enabled SSLCipherSuites is the same as the complete set of supported
 701  * SSLCipherSuites as obtained by SSLGetSupportedCiphers().
 702  */
 703 OSStatus
 704 SSLSetEnabledCiphers            (SSLContextRef                  context,
 705                                                          const SSLCipherSuite   *ciphers,
 706                                                          size_t                                 numCiphers)
 707         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 708
 709 /*
 710  * Determine number and values of all of the SSLCipherSuites currently enabled.
 711  * Caller allocates output buffer for SSLGetEnabledCiphers() and passes in
 712  * its size in *numCiphers. If supplied buffer is too small, errSSLBufferOverflow
 713  * will be returned.
 714  */
 715 OSStatus
 716 SSLGetNumberEnabledCiphers      (SSLContextRef                  context,
 717                                                          size_t                                 *numCiphers)
 718         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 719
 720 OSStatus
 721 SSLGetEnabledCiphers            (SSLContextRef                  context,
 722                                                          SSLCipherSuite                 *ciphers,               /* RETURNED */
 723                                                          size_t                                 *numCiphers)    /* IN/OUT */
 724         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
 725
 726
 727 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 728 /*
 729  * Enable/disable peer certificate chain validation. Default is enabled.
 730  * If caller disables, it is the caller's responsibility to call
 731  * SSLCopyPeerCertificates() upon successful completion of the handshake
 732  * and then to perform external validation of the peer certificate
 733  * chain before proceeding with data transfer.
 734  *
 735  * ==========================
 736  * MAC OS X ONLY (DEPRECATED)
 737  * ==========================
 738  * NOTE: this function is not available on iOS, and should be considered
 739  * deprecated on Mac OS X. To disable peer certificate chain validation, you
 740  * can instead use SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth
 741  * to true. This will disable verification and cause SSLHandshake to return with
 742  * an errSSLServerAuthCompleted result when the peer certificates have been
 743  * received; at that time, you can choose to evaluate peer trust yourself, or
 744  * simply call SSLHandshake again to proceed with the handshake.
 745  */
 746 OSStatus
 747 SSLSetEnableCertVerify          (SSLContextRef                  context,
 748                                                          Boolean                                enableVerify)
 749         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 750
 751 /*
 752  * Check whether peer certificate chain validation is enabled.
 753  *
 754  * ==========================
 755  * MAC OS X ONLY (DEPRECATED)
 756  * ==========================
 757  * NOTE: this function is not available on iOS, and should be considered
 758  * deprecated on Mac OS X. To check whether peer certificate chain validation
 759  * is enabled in a context, call SSLGetSessionOption to obtain the value of
 760  * the kSSLSessionOptionBreakOnServerAuth session option flag. If the value
 761  * of this option flag is true, then verification is disabled.
 762  */
 763 OSStatus
 764 SSLGetEnableCertVerify          (SSLContextRef                  context,
 765                                                          Boolean                                *enableVerify)  /* RETURNED */
 766         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 767
 768 /*
 769  * Specify the option of ignoring certificates' "expired" times.
 770  * This is a common failure in the real SSL world. Default setting for this
 771  * flag is false, meaning expired certs result in an errSSLCertExpired error.
 772  *
 773  * ==========================
 774  * MAC OS X ONLY (DEPRECATED)
 775  * ==========================
 776  * NOTE: this function is not available on iOS, and should be considered
 777  * deprecated on Mac OS X. To ignore expired certificate errors, first disable
 778  * Secure Transport's automatic verification of peer certificates by calling
 779  * SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth to true. When
 780  * SSLHandshake subsequently returns an errSSLServerAuthCompleted result,
 781  * your code should obtain the SecTrustRef for the peer's certificates and
 782  * perform a custom trust evaluation with SecTrust APIs (see SecTrust.h).
 783  * The SecTrustSetOptions function allows you to specify that the expiration
 784  * status of certificates should be ignored for this evaluation.
 785  *
 786  * Example:
 787  *
 788  *      status = SSLSetSessionOption(ctx, kSSLSessionOptionBreakOnServerAuth, true);
 789  *      do {
 790  *              status = SSLHandshake(ctx);
 791  *
 792  *              if (status == errSSLServerAuthCompleted) {
 793  *                      SecTrustRef peerTrust = NULL;
 794  *                      status = SSLCopyPeerTrust(ctx, &peerTrust);
 795  *                      if (status == errSecSuccess) {
 796  *                              SecTrustResultType trustResult;
 797  *                              // set flag to allow expired certificates
 798  *                              SecTrustSetOptions(peerTrust, kSecTrustOptionAllowExpired);
 799  *                              status = SecTrustEvaluate(peerTrust, &trustResult);
 800  *                              if (status == errSecSuccess) {
 801  *                                      // A "proceed" result means the cert is explicitly trusted,
 802  *                                      // e.g. "Always Trust" was clicked;
 803  *                                      // "Unspecified" means the cert has no explicit trust settings,
 804  *                                      // but is implicitly OK since it chains back to a trusted root.
 805  *                                      // Any other result means the cert is not trusted.
 806  *                                      //
 807  *                                      if (trustResult == kSecTrustResultProceed ||
 808  *                                              trustResult == kSecTrustResultUnspecified) {
 809  *                                              // certificate is trusted
 810  *                                              status = errSSLWouldBlock; // so we call SSLHandshake again
 811  *                                      } else if (trustResult == kSecTrustResultRecoverableTrustFailure) {
 812  *                                              // not trusted, for some reason other than being expired;
 813  *                                              // could ask the user whether to allow the connection here
 814  *                                              //
 815  *                                              status = errSSLXCertChainInvalid;
 816  *                                      } else {
 817  *                                              // cannot use this certificate (fatal)
 818  *                                              status = errSSLBadCert;
 819  *                                      }
 820  *                              }
 821  *                              if (peerTrust) {
 822  *                                      CFRelease(peerTrust);
 823  *                              }
 824  *                      }
 825  *              } // errSSLServerAuthCompleted
 826  *
 827  *      } while (status == errSSLWouldBlock);
 828  *
 829  */
 830 OSStatus
 831 SSLSetAllowsExpiredCerts        (SSLContextRef          context,
 832                                                          Boolean                        allowsExpired)
 833         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 834
 835 /*
 836  * Obtain the current value of an SSLContext's "allowExpiredCerts" flag.
 837  *
 838  * ==========================
 839  * MAC OS X ONLY (DEPRECATED)
 840  * ==========================
 841  * NOTE: this function is not available on iOS, and should be considered
 842  * deprecated on Mac OS X.
 843  */
 844 OSStatus
 845 SSLGetAllowsExpiredCerts        (SSLContextRef          context,
 846                                                          Boolean                        *allowsExpired) /* RETURNED */
 847         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 848
 849 /*
 850  * Similar to SSLSetAllowsExpiredCerts, SSLSetAllowsExpiredRoots allows the
 851  * option of ignoring "expired" status for root certificates only.
 852  * Default setting is false, i.e., expired root certs result in an
 853  * errSSLCertExpired error.
 854  *
 855  * ==========================
 856  * MAC OS X ONLY (DEPRECATED)
 857  * ==========================
 858  * NOTE: this function is not available on iOS, and should be considered
 859  * deprecated on Mac OS X. To ignore expired certificate errors, first disable
 860  * Secure Transport's automatic verification of peer certificates by calling
 861  * SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth to true. When
 862  * SSLHandshake subsequently returns an errSSLServerAuthCompleted result,
 863  * your code should obtain the SecTrustRef for the peer's certificates and
 864  * perform a custom trust evaluation with SecTrust APIs (see SecTrust.h).
 865  * The SecTrustSetOptions function allows you to specify that the expiration
 866  * status of certificates should be ignored for this evaluation.
 867  *
 868  * See the description of the SSLSetAllowsExpiredCerts function (above)
 869  * for a code example. The kSecTrustOptionAllowExpiredRoot option can be used
 870  * instead of kSecTrustOptionAllowExpired to allow expired roots only.
 871  */
 872 OSStatus
 873 SSLSetAllowsExpiredRoots        (SSLContextRef          context,
 874                                                          Boolean                        allowsExpired)
 875         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 876
 877 /*
 878  * Obtain the current value of an SSLContext's "allow expired roots" flag.
 879  *
 880  * ==========================
 881  * MAC OS X ONLY (DEPRECATED)
 882  * ==========================
 883  * NOTE: this function is not available on iOS, and should be considered
 884  * deprecated on Mac OS X.
 885  */
 886 OSStatus
 887 SSLGetAllowsExpiredRoots        (SSLContextRef          context,
 888                                                          Boolean                        *allowsExpired) /* RETURNED */
 889         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 890
 891 /*
 892  * Specify option of allowing for an unknown root cert, i.e., one which
 893  * this software can not verify as one of a list of known good root certs.
 894  * Default for this flag is false, in which case one of the following two
 895  * errors may occur:
 896  *    -- The peer returns a cert chain with a root cert, and the chain
 897  *       verifies to that root, but the root is not one of our trusted
 898  *       roots. This results in errSSLUnknownRootCert on handshake.
 899  *    -- The peer returns a cert chain which does not contain a root cert,
 900  *       and we can't verify the chain to one of our trusted roots. This
 901  *       results in errSSLNoRootCert on handshake.
 902  *
 903  * Both of these error conditions are ignored when the AllowAnyRoot flag is
 904  * true, allowing connection to a totally untrusted peer.
 905  *
 906  * ==========================
 907  * MAC OS X ONLY (DEPRECATED)
 908  * ==========================
 909  * NOTE: this function is not available on iOS, and should be considered
 910  * deprecated on Mac OS X. To ignore unknown root cert errors, first disable
 911  * Secure Transport's automatic verification of peer certificates by calling
 912  * SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth to true. When
 913  * SSLHandshake subsequently returns an errSSLServerAuthCompleted result,
 914  * your code should obtain the SecTrustRef for the peer's certificates and
 915  * perform a custom trust evaluation with SecTrust APIs (see SecTrust.h).
 916  *
 917  * See the description of the SSLSetAllowsExpiredCerts function (above)
 918  * for a code example. Note that an unknown root certificate will cause
 919  * SecTrustEvaluate to report kSecTrustResultRecoverableTrustFailure as the
 920  * trust result.
 921  */
 922 OSStatus
 923 SSLSetAllowsAnyRoot                     (SSLContextRef          context,
 924                                                          Boolean                        anyRoot)
 925         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 926
 927 /*
 928  * Obtain the current value of an SSLContext's "allow any root" flag.
 929  *
 930  * ==========================
 931  * MAC OS X ONLY (DEPRECATED)
 932  * ==========================
 933  * NOTE: this function is not available on iOS, and should be considered
 934  * deprecated on Mac OS X.
 935  */
 936 OSStatus
 937 SSLGetAllowsAnyRoot                     (SSLContextRef          context,
 938                                                          Boolean                        *anyRoot) /* RETURNED */
 939         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 940
 941 /*
 942  * Augment or replace the system's default trusted root certificate set
 943  * for this session. If replaceExisting is true, the specified roots will
 944  * be the only roots which are trusted during this session. If replaceExisting
 945  * is false, the specified roots will be added to the current set of trusted
 946  * root certs. If this function has never been called, the current trusted
 947  * root set is the same as the system's default trusted root set.
 948  * Successive calls with replaceExisting false result in accumulation
 949  * of additional root certs.
 950  *
 951  * The trustedRoots array contains SecCertificateRefs.
 952  *
 953  * ==========================
 954  * MAC OS X ONLY (DEPRECATED)
 955  * ==========================
 956  * NOTE: this function is not available on iOS, and should be considered
 957  * deprecated on Mac OS X. To trust specific roots in a session, first disable
 958  * Secure Transport's automatic verification of peer certificates by calling
 959  * SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth to true. When
 960  * SSLHandshake subsequently returns an errSSLServerAuthCompleted result,
 961  * your code should obtain the SecTrustRef for the peer's certificates and
 962  * perform a custom trust evaluation with SecTrust APIs (see SecTrust.h).
 963  *
 964  * See the description of the SSLSetAllowsExpiredCerts function (above)
 965  * for a code example. You can call SecTrustSetAnchorCertificates to
 966  * augment the system's trusted root set, or SecTrustSetAnchorCertificatesOnly
 967  * to make these the only trusted roots, prior to calling SecTrustEvaluate.
 968  */
 969 OSStatus
 970 SSLSetTrustedRoots                      (SSLContextRef          context,
 971                                                          CFArrayRef             trustedRoots,
 972                                                          Boolean                        replaceExisting)
 973         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 974
 975 /*
 976  * Obtain an array of SecCertificateRefs representing the current
 977  * set of trusted roots. If SSLSetTrustedRoots() has never been called
 978  * for this session, this returns the system's default root set.
 979  *
 980  * Caller must CFRelease the returned CFArray.
 981  *
 982  * ==========================
 983  * MAC OS X ONLY (DEPRECATED)
 984  * ==========================
 985  * NOTE: this function is not available on iOS, and should be considered
 986  * deprecated on Mac OS X. To get the current set of trusted roots, call the
 987  * SSLCopyPeerTrust function to obtain the SecTrustRef for the peer certificate
 988  * chain, then SecTrustCopyCustomAnchorCertificates (see SecTrust.h).
 989  */
 990 OSStatus
 991 SSLCopyTrustedRoots                     (SSLContextRef          context,
 992                                                          CFArrayRef             * __nonnull CF_RETURNS_RETAINED trustedRoots)   /* RETURNED */
 993         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
 994
 995 /*
 996  * Request peer certificates. Valid anytime, subsequent to a handshake attempt.
 997  *
 998  * The certs argument is a CFArray containing SecCertificateRefs.
 999  * Caller must CFRelease the returned array.
1000  *
1001  * The cert at index 0 of the returned array is the subject (end
1002  * entity) cert; the root cert (or the closest cert to it) is at
1003  * the end of the returned array.
1004  *
1005  * ==========================
1006  * MAC OS X ONLY (DEPRECATED)
1007  * ==========================
1008  * NOTE: this function is not available on iOS, and should be considered
1009  * deprecated on Mac OS X. To get peer certificates, call SSLCopyPeerTrust
1010  * to obtain the SecTrustRef for the peer certificate chain, then use the
1011  * SecTrustGetCertificateCount and SecTrustGetCertificateAtIndex functions
1012  * to retrieve individual certificates in the chain (see SecTrust.h).
1013  */
1014 OSStatus
1015 SSLCopyPeerCertificates         (SSLContextRef          context,
1016                                                          CFArrayRef                     * __nonnull CF_RETURNS_RETAINED certs)          /* RETURNED */
1017         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
1018
1019 #endif /* MAC OS X */
1020
1021 /*
1022  * Obtain a SecTrustRef representing peer certificates. Valid anytime,
1023  * subsequent to a handshake attempt. Caller must CFRelease the returned
1024  * trust reference.
1025  *
1026  * The returned trust reference will have already been evaluated for you,
1027  * unless one of the following is true:
1028  * - Your code has disabled automatic certificate verification, by calling
1029  *   SSLSetSessionOption to set kSSLSessionOptionBreakOnServerAuth to true.
1030  * - Your code has called SSLSetPeerID, and this session has been resumed
1031  *   from an earlier cached session.
1032  *
1033  * In these cases, your code should call SecTrustEvaluate prior to
1034  * examining the peer certificate chain or trust results (see SecTrust.h).
1035  *
1036  * NOTE: if you have not called SSLHandshake at least once prior to
1037  * calling this function, the returned trust reference will be NULL.
1038  */
1039 OSStatus
1040 SSLCopyPeerTrust                        (SSLContextRef          context,
1041                                                          SecTrustRef            * __nonnull CF_RETURNS_RETAINED trust)          /* RETURNED */
1042         __OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_5_0);
1043
1044 /*
1045  * Specify some data, opaque to this library, which is sufficient
1046  * to uniquely identify the peer of the current session. An example
1047  * would be IP address and port, stored in some caller-private manner.
1048  * To be optionally called prior to SSLHandshake for the current
1049  * session. This is mandatory if this session is to be resumable.
1050  *
1051  * SecureTransport allocates its own copy of the incoming peerID. The
1052  * data provided in *peerID, while opaque to SecureTransport, is used
1053  * in a byte-for-byte compare to other previous peerID values set by the
1054  * current application. Matching peerID blobs result in SecureTransport
1055  * attempting to resume an SSL session with the same parameters as used
1056  * in the previous session which specified the same peerID bytes.
1057  */
1058 OSStatus
1059 SSLSetPeerID                            (SSLContextRef          context,
1060                                                          const void             * __nullable peerID,
1061                                                          size_t                         peerIDLen)
1062         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1063
1064 /*
1065  * Obtain current PeerID. Returns NULL pointer, zero length if
1066  * SSLSetPeerID has not been called for this context.
1067  */
1068 OSStatus
1069 SSLGetPeerID                            (SSLContextRef          context,
1070                                                          const void             * __nullable * __nonnull peerID,
1071                                                          size_t                         *peerIDLen)
1072         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1073
1074 /*
1075  * Obtain the SSLCipherSuite (e.g., SSL_RSA_WITH_DES_CBC_SHA) negotiated
1076  * for this session. Only valid when a session is active.
1077  */
1078 OSStatus
1079 SSLGetNegotiatedCipher          (SSLContextRef          context,
1080                                                          SSLCipherSuite         *cipherSuite)
1081         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1082
1083
1084 /********************************************************
1085  *** Session context configuration, server side only. ***
1086  ********************************************************/
1087
1088 /*
1089  * This function is deprecated in OSX 10.11 and iOS 9.0 and
1090  * has no effect on the TLS handshake since OSX 10.10 and
1091  * iOS 8.0. Using separate RSA certificates for encryption
1092  * and signing is no longer supported.
1093  */
1094 OSStatus
1095 SSLSetEncryptionCertificate     (SSLContextRef          context,
1096                                                          CFArrayRef                     certRefs)
1097         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2, __MAC_10_11, __IPHONE_5_0, __IPHONE_9_0);
1098
1099 /*
1100  * Specify requirements for client-side authentication.
1101  * Optional; Default is kNeverAuthenticate.
1102  *
1103  * Can only be called when no session is active.
1104  */
1105 typedef CF_ENUM(int, SSLAuthenticate) {
1106         kNeverAuthenticate,                     /* skip client authentication */
1107         kAlwaysAuthenticate,            /* require it */
1108         kTryAuthenticate                        /* try to authenticate, but not an error
1109                                                                  * if client doesn't have a cert */
1110 };
1111
1112 OSStatus
1113 SSLSetClientSideAuthenticate    (SSLContextRef          context,
1114                                                                  SSLAuthenticate        auth)
1115         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1116
1117 /*
1118  * Add a DER-encoded distinguished name to list of acceptable names
1119  * to be specified in requests for client certificates.
1120  */
1121 OSStatus
1122 SSLAddDistinguishedName         (SSLContextRef          context,
1123                                                          const void             * __nullable derDN,
1124                                                          size_t                         derDNLen)
1125         __OSX_AVAILABLE_STARTING(__MAC_10_4, __IPHONE_5_0);
1126
1127
1128 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
1129 /*
1130  * Add a SecCertificateRef, or a CFArray of them, to a server's list
1131  * of acceptable Certificate Authorities (CAs) to present to the client
1132  * when client authentication is performed.
1133  *
1134  * If replaceExisting is true, the specified certificate(s) will replace
1135  * a possible existing list of acceptable CAs. If replaceExisting is
1136  * false, the specified certificate(s) will be appended to the existing
1137  * list of acceptable CAs, if any.
1138  *
1139  * Returns errSecParam if this is called on a SSLContextRef which
1140  * is configured as a client, or when a session is active.
1141  *
1142  * NOTE: this function is currently not available on iOS.
1143  */
1144 OSStatus
1145 SSLSetCertificateAuthorities(SSLContextRef              context,
1146                                                          CFTypeRef                      certificateOrArray,
1147                                                          Boolean                        replaceExisting)
1148         __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
1149
1150 /*
1151  * Obtain the certificates specified in SSLSetCertificateAuthorities(),
1152  * if any. Returns a NULL array if SSLSetCertificateAuthorities() has not
1153  * been called.
1154  * Caller must CFRelease the returned array.
1155  *
1156  * NOTE: this function is currently not available on iOS.
1157  */
1158 OSStatus
1159 SSLCopyCertificateAuthorities(SSLContextRef             context,
1160                                                           CFArrayRef            * __nonnull CF_RETURNS_RETAINED certificates)   /* RETURNED */
1161         __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_NA);
1162
1163 #endif /* MAC OS X */
1164
1165 /*
1166  * Obtain the list of acceptable distinguished names as provided by
1167  * a server (if the SSLContextRef is configured as a client), or as
1168  * specified by SSLSetCertificateAuthorities (if the SSLContextRef
1169  * is configured as a server).
1170  * The returned array contains CFDataRefs, each of which represents
1171  * one DER-encoded RDN.
1172  *
1173  * Caller must CFRelease the returned array.
1174  */
1175 OSStatus
1176 SSLCopyDistinguishedNames       (SSLContextRef          context,
1177                                                          CFArrayRef                     * __nonnull CF_RETURNS_RETAINED names)
1178         __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_5_0);
1179
1180 /*
1181  * Obtain client certificate exchange status. Can be called
1182  * any time. Reflects the *last* client certificate state change;
1183  * subsequent to a renegotiation attempt by either peer, the state
1184  * is reset to kSSLClientCertNone.
1185  */
1186 OSStatus
1187 SSLGetClientCertificateState    (SSLContextRef                          context,
1188                                                                  SSLClientCertificateState      *clientState)
1189         __OSX_AVAILABLE_STARTING(__MAC_10_3, __IPHONE_5_0);
1190
1191
1192 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
1193 /*
1194  * Specify Diffie-Hellman parameters. Optional; if we are configured to allow
1195  * for D-H ciphers and a D-H cipher is negotiated, and this function has not
1196  * been called, a set of process-wide parameters will be calculated. However
1197  * that can take a long time (30 seconds).
1198  *
1199  * NOTE: this function is currently not available on iOS.
1200  */
1201 OSStatus SSLSetDiffieHellmanParams      (SSLContextRef                  context,
1202                                                                          const void                     * __nullable dhParams,
1203                                                                          size_t                                 dhParamsLen)
1204         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_NA);
1205
1206 /*
1207  * Return parameter block specified in SSLSetDiffieHellmanParams.
1208  * Returned data is not copied and belongs to the SSLContextRef.
1209  *
1210  * NOTE: this function is currently not available on iOS.
1211  */
1212 OSStatus SSLGetDiffieHellmanParams      (SSLContextRef                  context,
1213                                                                          const void                     * __nullable * __nonnull dhParams,
1214                                                                          size_t                                 *dhParamsLen)
1215         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_NA);
1216
1217 /*
1218  * Enable/Disable RSA blinding. This feature thwarts a known timing
1219  * attack to which RSA keys are vulnerable; enabling it is a tradeoff
1220  * between performance and security. The default for RSA blinding is
1221  * enabled.
1222  *
1223  * ==========================
1224  * MAC OS X ONLY (DEPRECATED)
1225  * ==========================
1226  * NOTE: this function is not available on iOS, and should be considered
1227  * deprecated on Mac OS X. RSA blinding is enabled unconditionally, as
1228  * it prevents a known way for an attacker to recover the private key,
1229  * and the performance gain of disabling it is negligible.
1230  */
1231 OSStatus SSLSetRsaBlinding                      (SSLContextRef                  context,
1232                                                                          Boolean                                blinding)
1233         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
1234
1235 OSStatus SSLGetRsaBlinding                      (SSLContextRef                  context,
1236                                                                          Boolean                                *blinding)
1237         __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_2,__MAC_10_9,__IPHONE_NA,__IPHONE_NA);
1238
1239 #endif /* MAC OS X */
1240
1241 /*******************************
1242  ******** I/O Functions ********
1243  *******************************/
1244
1245 /*
1246  * Note: depending on the configuration of the underlying I/O
1247  * connection, all SSL I/O functions can return errSSLWouldBlock,
1248  * indicating "not complete, nothing is wrong, except required
1249  * I/O hasn't completed". Caller may need to repeat I/Os as necessary
1250  * if the underlying connection has been configured to behave in
1251  * a non-blocking manner.
1252  */
1253
1254 /*
1255  * Perform the SSL handshake. On successful return, session is
1256  * ready for normal secure application I/O via SSLWrite and SSLRead.
1257  *
1258  * Interesting error returns:
1259  *
1260  *  errSSLUnknownRootCert: Peer had a valid cert chain, but the root of
1261  *      the chain is unknown.
1262  *
1263  *  errSSLNoRootCert: Peer had a cert chain which did not end in a root.
1264  *
1265  *  errSSLCertExpired: Peer's cert chain had one or more expired certs.
1266  *
1267  *  errSSLXCertChainInvalid: Peer had an invalid cert chain (i.e.,
1268  *      signature verification within the chain failed, or no certs
1269  *      were found).
1270  *
1271  *  In all of the above errors, the handshake was aborted; the peer's
1272  *  cert chain is available via SSLCopyPeerTrust or SSLCopyPeerCertificates.
1273  *
1274  *  Other interesting result codes:
1275  *
1276  *  errSSLPeerAuthCompleted: Peer's cert chain is valid, or was ignored if
1277  *      cert verification was disabled via SSLSetEnableCertVerify. The application
1278  *      may decide to continue with the handshake (by calling SSLHandshake
1279  *      again), or close the connection at this point.
1280  *
1281  *  errSSLClientCertRequested: The server has requested a client certificate.
1282  *      The client may choose to examine the server's certificate and
1283  *      distinguished name list, then optionally call SSLSetCertificate prior
1284  *      to resuming the handshake by calling SSLHandshake again.
1285  *
1286  * A return value of errSSLWouldBlock indicates that SSLHandshake has to be
1287  * called again (and again and again until something else is returned).
1288  */
1289 OSStatus
1290 SSLHandshake                            (SSLContextRef          context)
1291         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1292
1293 /*
1294  * Normal application-level read/write. On both of these, a errSSLWouldBlock
1295  * return and a partially completed transfer - or even zero bytes transferred -
1296  * are NOT mutually exclusive.
1297  */
1298 OSStatus
1299 SSLWrite                                        (SSLContextRef          context,
1300                                                          const void *           __nullable data,
1301                                                          size_t                         dataLength,
1302                                                          size_t                         *processed)             /* RETURNED */
1303         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1304
1305 /*
1306  * data is mallocd by caller; available size specified in
1307  * dataLength; actual number of bytes read returned in
1308  * *processed.
1309  */
1310 OSStatus
1311 SSLRead                                         (SSLContextRef          context,
1312                                                          void *                         data,                   /* RETURNED */
1313                                                          size_t                         dataLength,
1314                                                          size_t                         *processed)             /* RETURNED */
1315         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1316
1317 /*
1318  * Determine how much data the client can be guaranteed to
1319  * obtain via SSLRead() without blocking or causing any low-level
1320  * read operations to occur.
1321  */
1322 OSStatus
1323 SSLGetBufferedReadSize          (SSLContextRef context,
1324                                                          size_t *bufSize)                                       /* RETURNED */
1325         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1326
1327 /*
1328  * Determine how much data the application can be guaranteed to write
1329  * with SSLWrite() without causing fragmentation. The value is based on
1330  * the maximum Datagram Record size defined by the application with
1331  * SSLSetMaxDatagramRecordSize(), minus the DTLS Record header size.
1332  */
1333 OSStatus
1334 SSLGetDatagramWriteSize         (SSLContextRef dtlsContext,
1335                                                          size_t *bufSize)
1336         __OSX_AVAILABLE_STARTING(__MAC_10_8, __IPHONE_5_0);
1337
1338 /*
1339  * Terminate current SSL session.
1340  */
1341 OSStatus
1342 SSLClose                                        (SSLContextRef          context)
1343         __OSX_AVAILABLE_STARTING(__MAC_10_2, __IPHONE_5_0);
1344
1345 /*
1346  * Set the minimum acceptable strength of policy to be negotiated for an
1347  * ATS session
1348  */
1349 OSStatus
1350 SSLSetSessionStrengthPolicy(SSLContextRef context,
1351                             SSLSessionStrengthPolicy policyStrength);
1352
1353 CF_IMPLICIT_BRIDGING_DISABLED
1354 CF_ASSUME_NONNULL_END
1355
1356 #ifdef __cplusplus
1357 }
1358 #endif
1359
1360 #endif /* !_SECURITY_SECURETRANSPORT_H_ */