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Cached

CipherType

DTLSQueuedMessageStr

DTLSRecvdRecordsStr

ECType

SSL3BulkCipher

SSL3Ciphertext

SSL3HandshakeHashType

SSL3HandshakeStateStr

SSL3WaitState

SSLAppOperation

SSLWrappedSymWrappingKeyStr

SessionTicketStr

TLS13CertificateRequestStr

TLS13EarlyDataStr

TLS13KeyShareEntryStr

TLS13SessionTicketFlags

ssl3BulkCipherDefStr

ssl3CertNodeStr

ssl3CipherSpecStr

ssl3CipherSuiteCfg

ssl3CipherSuiteDefStr

ssl3DHParamsStr

ssl3KEADef

ssl3KeyMaterial

ssl3MACDefStr

ssl3SidKeys

ssl3StateStr

sslBufferStr

sslClientHelloType

sslConnectInfoStr

sslEphemeralKeyPair

sslGatherStr

sslHandshakingType

sslKeyPairStr

sslNamedGroupDef

sslOptionsStr

sslSecurityInfoStr

sslSessionIDStr

sslSocketOpsStr

sslSocketStr

sslZeroRttIgnore

sslZeroRttState

Macros

Line Code
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is PRIVATE to SSL and should be the first thing included by
 * any SSL implementation file.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __sslimpl_h_
#define __sslimpl_h_

#ifdef DEBUG
#undef NDEBUG
#else
#undef NDEBUG
#define NDEBUG
#endif
#include "secport.h"
#include "secerr.h"
#include "sslerr.h"
#include "ssl3prot.h"
#include "hasht.h"
#include "nssilock.h"
#include "pkcs11t.h"
#if defined(XP_UNIX) || defined(XP_BEOS)
#include "unistd.h"
#endif
#include "nssrwlk.h"
#include "prthread.h"
#include "prclist.h"
#include "private/pprthred.h"

#include "sslt.h" /* for some formerly private types, now public */

typedef struct sslSocketStr sslSocket;
typedef struct ssl3CipherSpecStr ssl3CipherSpec;
#include "ssl3ext.h"

/* to make some of these old enums public without namespace pollution,
** it was necessary to prepend ssl_ to the names.
** These #defines preserve compatibility with the old code here in libssl.
*/
typedef SSLMACAlgorithm SSL3MACAlgorithm;

#define calg_null ssl_calg_null
#define calg_rc4 ssl_calg_rc4
#define calg_rc2 ssl_calg_rc2
#define calg_des ssl_calg_des
#define calg_3des ssl_calg_3des
#define calg_idea ssl_calg_idea
#define calg_fortezza ssl_calg_fortezza /* deprecated, must preserve */
#define calg_aes ssl_calg_aes
#define calg_camellia ssl_calg_camellia
#define calg_seed ssl_calg_seed
#define calg_aes_gcm ssl_calg_aes_gcm
#define calg_chacha20 ssl_calg_chacha20

#define mac_null ssl_mac_null
#define mac_md5 ssl_mac_md5
#define mac_sha ssl_mac_sha
#define hmac_md5 ssl_hmac_md5
#define hmac_sha ssl_hmac_sha
#define hmac_sha256 ssl_hmac_sha256
#define hmac_sha384 ssl_hmac_sha384
#define mac_aead ssl_mac_aead

#if defined(DEBUG) || defined(TRACE)
#ifdef __cplusplus
#define Debug 1
#else
extern int Debug;
#endif
#else
#undef Debug
#endif

#if defined(DEBUG) && !defined(TRACE) && !defined(NISCC_TEST)
#define TRACE
#endif

#ifdef TRACE
#define SSL_TRC(a, b)     \
    if (ssl_trace >= (a)) \
    ssl_Trace b
#define PRINT_BUF(a, b)   \
    if (ssl_trace >= (a)) \
    ssl_PrintBuf b
#define PRINT_KEY(a, b)   \
    if (ssl_trace >= (a)) \
    ssl_PrintKey b
#else
#define SSL_TRC(a, b)
#define PRINT_BUF(a, b)
#define PRINT_KEY(a, b)
#endif

#ifdef DEBUG
#define SSL_DBG(b) \
    if (ssl_debug) \
    ssl_Trace b
#else
#define SSL_DBG(b)
#endif

#define LSB(x) ((unsigned char)((x)&0xff))
#define MSB(x) ((unsigned char)(((unsigned)(x)) >> 8))

#define CONST_CAST(T, X) ((T *)(X))

/************************************************************************/

typedef enum { SSLAppOpRead = 0,
               SSLAppOpWrite,
               SSLAppOpRDWR,
               SSLAppOpPost,
               SSLAppOpHeader
} SSLAppOperation;

#define SSL3_SESSIONID_BYTES 32

#define SSL_MIN_CHALLENGE_BYTES 16
#define SSL_MAX_CHALLENGE_BYTES 32

#define SSL3_MASTER_SECRET_LENGTH 48

/* number of wrap mechanisms potentially used to wrap master secrets. */
#define SSL_NUM_WRAP_MECHS 15
#define SSL_NUM_WRAP_KEYS 6

/* This makes the cert cache entry exactly 4k. */
#define SSL_MAX_CACHED_CERT_LEN 4060

#ifndef BPB
#define BPB 8 /* Bits Per Byte */
#endif

/* The default value from RFC 4347 is 1s, which is too slow. */
#define DTLS_RETRANSMIT_INITIAL_MS 50
/* The maximum time to wait between retransmissions. */
#define DTLS_RETRANSMIT_MAX_MS 10000
/* Time to wait in FINISHED state for retransmissions. */
#define DTLS_RETRANSMIT_FINISHED_MS 30000

/* default number of entries in namedGroupPreferences */
#define SSL_NAMED_GROUP_COUNT 31

/* Types and names of elliptic curves used in TLS */
typedef enum {
    ec_type_explicitPrime = 1,      /* not supported */
    ec_type_explicitChar2Curve = 2, /* not supported */
    ec_type_named = 3
} ECType;

typedef enum {
    ticket_allow_early_data = 1,
    ticket_allow_psk_ke = 2,
    ticket_allow_psk_dhe_ke = 4,
    ticket_allow_psk_auth = 8,
    ticket_allow_psk_sign_auth = 16
} TLS13SessionTicketFlags;

typedef struct {
    /* The name is the value that is encoded on the wire in TLS. */
    SSLNamedGroup name;
    /* The number of bits in the group. */
    unsigned int bits;
    /* The key exchange algorithm this group provides. */
    SSLKEAType keaType;
    /* The OID that identifies the group to PKCS11.  This also determines
     * whether the group is enabled in policy. */
    SECOidTag oidTag;
    /* Assume that the group is always supported. */
    PRBool assumeSupported;
} sslNamedGroupDef;

typedef struct sslBufferStr sslBuffer;
typedef struct sslConnectInfoStr sslConnectInfo;
typedef struct sslGatherStr sslGather;
typedef struct sslSecurityInfoStr sslSecurityInfo;
typedef struct sslSessionIDStr sslSessionID;
typedef struct sslSocketOpsStr sslSocketOps;

typedef struct ssl3StateStr ssl3State;
typedef struct ssl3CertNodeStr ssl3CertNode;
typedef struct ssl3BulkCipherDefStr ssl3BulkCipherDef;
typedef struct ssl3MACDefStr ssl3MACDef;
typedef struct sslKeyPairStr sslKeyPair;
typedef struct ssl3DHParamsStr ssl3DHParams;

struct ssl3CertNodeStr {
    struct ssl3CertNodeStr *next;
    CERTCertificate *cert;
};

typedef SECStatus (*sslHandshakeFunc)(sslSocket *ss);

typedef void (*sslSessionIDCacheFunc)(sslSessionID *sid);
typedef void (*sslSessionIDUncacheFunc)(sslSessionID *sid);
typedef sslSessionID *(*sslSessionIDLookupFunc)(const PRIPv6Addr *addr,
                                                unsigned char *sid,
                                                unsigned int sidLen,
                                                CERTCertDBHandle *dbHandle);
typedef void (*sslCipherSpecChangedFunc)(void *arg,
                                         PRBool sending,
                                         ssl3CipherSpec *newSpec);

/* Socket ops */
struct sslSocketOpsStr {
    int (*connect)(sslSocket *, const PRNetAddr *);
    PRFileDesc *(*accept)(sslSocket *, PRNetAddr *);
    int (*bind)(sslSocket *, const PRNetAddr *);
    int (*listen)(sslSocket *, int);
    int (*shutdown)(sslSocket *, int);
    int (*close)(sslSocket *);

    int (*recv)(sslSocket *, unsigned char *, int, int);

    /* points to the higher-layer send func, e.g. ssl_SecureSend. */
    int (*send)(sslSocket *, const unsigned char *, int, int);
    int (*read)(sslSocket *, unsigned char *, int);
    int (*write)(sslSocket *, const unsigned char *, int);

    int (*getpeername)(sslSocket *, PRNetAddr *);
    int (*getsockname)(sslSocket *, PRNetAddr *);
};

/* Flags interpreted by ssl send functions. */
#define ssl_SEND_FLAG_FORCE_INTO_BUFFER 0x40000000
#define ssl_SEND_FLAG_NO_BUFFER 0x20000000
#define ssl_SEND_FLAG_NO_RETRANSMIT 0x08000000 /* DTLS only */
#define ssl_SEND_FLAG_CAP_RECORD_VERSION \
    0x04000000 /* TLS only */
#define ssl_SEND_FLAG_MASK 0x7f000000

/*
** A buffer object.
*/
struct sslBufferStr {
    unsigned char *buf;
    unsigned int len;
    unsigned int space;
};

/*
** SSL3 cipher suite policy and preference struct.
*/
typedef struct {
#if !defined(_WIN32)
    unsigned int cipher_suite : 16;
    unsigned int policy : 8;
    unsigned int enabled : 1;
    unsigned int isPresent : 1;
#else
    ssl3CipherSuite cipher_suite;
    PRUint8 policy;
    unsigned char enabled : 1;
    unsigned char isPresent : 1;
#endif
} ssl3CipherSuiteCfg;

#define ssl_V3_SUITES_IMPLEMENTED 71

#define MAX_DTLS_SRTP_CIPHER_SUITES 4

/* MAX_SIGNATURE_SCHEMES allows for all the values we support. */
#define MAX_SIGNATURE_SCHEMES 15

typedef struct sslOptionsStr {
    /* If SSL_SetNextProtoNego has been called, then this contains the
     * list of supported protocols. */
    SECItem nextProtoNego;

    unsigned int useSecurity : 1;
    unsigned int useSocks : 1;
    unsigned int requestCertificate : 1;
    unsigned int requireCertificate : 2;
    unsigned int handshakeAsClient : 1;
    unsigned int handshakeAsServer : 1;
    unsigned int noCache : 1;
    unsigned int fdx : 1;
    unsigned int detectRollBack : 1;
    unsigned int noLocks : 1;
    unsigned int enableSessionTickets : 1;
    unsigned int enableDeflate : 1;
    unsigned int enableRenegotiation : 2;
    unsigned int requireSafeNegotiation : 1;
    unsigned int enableFalseStart : 1;
    unsigned int cbcRandomIV : 1;
    unsigned int enableOCSPStapling : 1;
    unsigned int enableNPN : 1;
    unsigned int enableALPN : 1;
    unsigned int reuseServerECDHEKey : 1;
    unsigned int enableFallbackSCSV : 1;
    unsigned int enableServerDhe : 1;
    unsigned int enableExtendedMS : 1;
    unsigned int enableSignedCertTimestamps : 1;
    unsigned int requireDHENamedGroups : 1;
    unsigned int enable0RttData : 1;
    unsigned int enableShortHeaders : 1;
} sslOptions;

typedef enum { sslHandshakingUndetermined = 0,
               sslHandshakingAsClient,
               sslHandshakingAsServer
} sslHandshakingType;

#define SSL_LOCK_RANK_SPEC 255

/* These are the valid values for shutdownHow.
** These values are each 1 greater than the NSPR values, and the code
** depends on that relation to efficiently convert PR_SHUTDOWN values
** into ssl_SHUTDOWN values.  These values use one bit for read, and
** another bit for write, and can be used as bitmasks.
*/
#define ssl_SHUTDOWN_NONE 0 /* NOT shutdown at all */
#define ssl_SHUTDOWN_RCV 1  /* PR_SHUTDOWN_RCV  +1 */
#define ssl_SHUTDOWN_SEND 2 /* PR_SHUTDOWN_SEND +1 */
#define ssl_SHUTDOWN_BOTH 3 /* PR_SHUTDOWN_BOTH +1 */

/*
** A gather object. Used to read some data until a count has been
** satisfied. Primarily for support of async sockets.
** Everything in here is protected by the recvBufLock.
*/
struct sslGatherStr {
    int state; /* see GS_ values below. */

    /* "buf" holds received plaintext SSL records, after decrypt and MAC check.
     * recv'd ciphertext records are put in inbuf (see below), then decrypted
     * into buf.
     */
    sslBuffer buf; /*recvBufLock*/

    /* number of bytes previously read into hdr or inbuf.
    ** (offset - writeOffset) is the number of ciphertext bytes read in but
    **     not yet deciphered.
    */
    unsigned int offset;

    /* number of bytes to read in next call to ssl_DefRecv (recv) */
    unsigned int remainder;

    /* DoRecv uses the next two values to extract application data.
    ** The difference between writeOffset and readOffset is the amount of
    ** data available to the application.   Note that the actual offset of
    ** the data in "buf" is recordOffset (above), not readOffset.
    ** In the current implementation, this is made available before the
    ** MAC is checked!!
    */
    unsigned int readOffset; /* Spot where DATA reader (e.g. application
                               ** or handshake code) will read next.
                               ** Always zero for SSl3 application data.
                               */
    /* offset in buf/inbuf/hdr into which new data will be read from socket. */
    unsigned int writeOffset;

    /* Buffer for ssl3 to read (encrypted) data from the socket */
    sslBuffer inbuf; /*recvBufLock*/

    /* The ssl[23]_GatherData functions read data into this buffer, rather
    ** than into buf or inbuf, while in the GS_HEADER state.
    ** The portion of the SSL record header put here always comes off the wire
    ** as plaintext, never ciphertext.
    ** For SSL3/TLS, the plaintext portion is 5 bytes long. For DTLS it is 13.
    */
    unsigned char hdr[13];

    /* Buffer for DTLS data read off the wire as a single datagram */
    sslBuffer dtlsPacket;

    /* the start of the buffered DTLS record in dtlsPacket */
    unsigned int dtlsPacketOffset;

    /* tracks whether we've seen a v3-type record before and must reject
     * any further v2-type records. */
    PRBool rejectV2Records;
};

/* sslGather.state */
#define GS_INIT 0
#define GS_HEADER 1
#define GS_DATA 2

/*
** ssl3State and CipherSpec structs
*/

/* The SSL bulk cipher definition */
typedef enum {
    cipher_null,
    cipher_rc4,
    cipher_des,
    cipher_3des,
    cipher_aes_128,
    cipher_aes_256,
    cipher_camellia_128,
    cipher_camellia_256,
    cipher_seed,
    cipher_aes_128_gcm,
    cipher_aes_256_gcm,
    cipher_chacha20,
    cipher_missing /* reserved for no such supported cipher */
    /* This enum must match ssl3_cipherName[] in ssl3con.c.  */
} SSL3BulkCipher;

typedef enum { type_stream,
               type_block,
               type_aead } CipherType;

#define MAX_IV_LENGTH 24

typedef PRUint64 sslSequenceNumber;
typedef PRUint16 DTLSEpoch;

typedef void (*DTLSTimerCb)(sslSocket *);

typedef struct {
    SSL3Opaque wrapped_master_secret[48];
    PRUint16 wrapped_master_secret_len;
    PRUint8 msIsWrapped;
    PRUint8 resumable;
    PRUint8 extendedMasterSecretUsed;
} ssl3SidKeys; /* 52 bytes */

typedef struct {
    PK11SymKey *write_key;
    PK11SymKey *write_mac_key;
    PK11Context *write_mac_context;
    SECItem write_key_item;
    SECItem write_iv_item;
    SECItem write_mac_key_item;
    SSL3Opaque write_iv[MAX_IV_LENGTH];
} ssl3KeyMaterial;

typedef SECStatus (*SSLCipher)(void *context,
                               unsigned char *out,
                               int *outlen,
                               int maxout,
                               const unsigned char *in,
                               int inlen);
typedef SECStatus (*SSLAEADCipher)(
    ssl3KeyMaterial *keys,
    PRBool doDecrypt,
    unsigned char *out,
    int *outlen,
    int maxout,
    const unsigned char *in,
    int inlen,
    const unsigned char *additionalData,
    int additionalDataLen);
typedef SECStatus (*SSLCompressor)(void *context,
                                   unsigned char *out,
                                   int *outlen,
                                   int maxout,
                                   const unsigned char *in,
                                   int inlen);
typedef SECStatus (*SSLDestroy)(void *context, PRBool freeit);

/* The DTLS anti-replay window in number of packets. Defined here because we
 * need it in the cipher spec. Note that this is a ring buffer but left and
 * right represent the true window, with modular arithmetic used to map them
 * onto the buffer.
 */
#define DTLS_RECVD_RECORDS_WINDOW 1024
#define RECORD_SEQ_MAX ((1ULL << 48) - 1)
PR_STATIC_ASSERT(DTLS_RECVD_RECORDS_WINDOW % 8 == 0);

typedef struct DTLSRecvdRecordsStr {
    unsigned char data[DTLS_RECVD_RECORDS_WINDOW / 8];
    sslSequenceNumber left;
    sslSequenceNumber right;
} DTLSRecvdRecords;

/*
** These are the "specs" in the "ssl3" struct.
** Access to the pointers to these specs, and all the specs' contents
** (direct and indirect) is protected by the reader/writer lock ss->specLock.
*/
struct ssl3CipherSpecStr {
    PRCList link;
    const ssl3BulkCipherDef *cipher_def;
    const ssl3MACDef *mac_def;
    SSLCompressionMethod compression_method;
    int mac_size;
    SSLCipher encode;
    SSLCipher decode;
    SSLAEADCipher aead;
    void *encodeContext;
    void *decodeContext;
    SSLCompressor compressor;   /* Don't name these fields compress */
    SSLCompressor decompressor; /* and uncompress because zconf.h   */
                                /* may define them as macros.       */
    SSLDestroy destroyCompressContext;
    void *compressContext;
    SSLDestroy destroyDecompressContext;
    void *decompressContext;
    PK11SymKey *master_secret;
    sslSequenceNumber write_seq_num;
    sslSequenceNumber read_seq_num;
    SSL3ProtocolVersion version;
    ssl3KeyMaterial client;
    ssl3KeyMaterial server;
    SECItem msItem;
    DTLSEpoch epoch;
    DTLSRecvdRecords recvdRecords;

    PRUint8 refCt;
    const char *phase;
};

typedef enum { never_cached,
               in_client_cache,
               in_server_cache,
               invalid_cache /* no longer in any cache. */
} Cached;

#include "sslcert.h"

struct sslSessionIDStr {
    /* The global cache lock must be held when accessing these members when the
     * sid is in any cache.
     */
    sslSessionID *next; /* chain used for client sockets, only */
    Cached cached;
    int references;
    PRUint32 lastAccessTime; /* seconds since Jan 1, 1970 */

    /* The rest of the members, except for the members of u.ssl3.locked, may
     * be modified only when the sid is not in any cache.
     */

    CERTCertificate *peerCert;
    SECItemArray peerCertStatus;        /* client only */
    const char *peerID;                 /* client only */
    const char *urlSvrName;             /* client only */
    const sslNamedGroupDef *namedCurve; /* (server) for certificate lookup */
    CERTCertificate *localCert;

    PRIPv6Addr addr;
    PRUint16 port;

    SSL3ProtocolVersion version;

    PRUint32 creationTime;   /* seconds since Jan 1, 1970 */
    PRUint32 expirationTime; /* seconds since Jan 1, 1970 */

    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;

    union {
        struct {
            /* values that are copied into the server's on-disk SID cache. */
            PRUint8 sessionIDLength;
            SSL3Opaque sessionID[SSL3_SESSIONID_BYTES];

            ssl3CipherSuite cipherSuite;
            SSLCompressionMethod compression;
            int policy;
            ssl3SidKeys keys;
            /* mechanism used to wrap master secret */
            CK_MECHANISM_TYPE masterWrapMech;

            /* The following values are NOT restored from the server's on-disk
             * session cache, but are restored from the client's cache.
             */
            PK11SymKey *clientWriteKey;
            PK11SymKey *serverWriteKey;

            /* The following values pertain to the slot that wrapped the
            ** master secret. (used only in client)
            */
            SECMODModuleID masterModuleID;
            /* what module wrapped the master secret */
            CK_SLOT_ID masterSlotID;
            PRUint16 masterWrapIndex;
            /* what's the key index for the wrapping key */
            PRUint16 masterWrapSeries;
            /* keep track of the slot series, so we don't
             * accidently try to use new keys after the
             * card gets removed and replaced.*/

            /* The following values pertain to the slot that did the signature
            ** for client auth.   (used only in client)
            */
            SECMODModuleID clAuthModuleID;
            CK_SLOT_ID clAuthSlotID;
            PRUint16 clAuthSeries;

            char masterValid;
            char clAuthValid;

            SECItem srvName;

            /* Signed certificate timestamps received in a TLS extension.
            ** (used only in client).
            */
            SECItem signedCertTimestamps;

            /* The NPN/ALPN value negotiated in the original connection.
             * Used for TLS 1.3. */
            SECItem alpnSelection;

            /* This lock is lazily initialized by CacheSID when a sid is first
             * cached. Before then, there is no need to lock anything because
             * the sid isn't being shared by anything.
             */
            PRRWLock *lock;

            /* The lock must be held while reading or writing these members
             * because they change while the sid is cached.
             */
            struct {
                /* The session ticket, if we have one, is sent as an extension
                 * in the ClientHello message. This field is used only by
                 * clients. It is protected by lock when lock is non-null
                 * (after the sid has been added to the client session cache).
                 */
                NewSessionTicket sessionTicket;
            } locked;
        } ssl3;
    } u;
};

typedef struct ssl3CipherSuiteDefStr {
    ssl3CipherSuite cipher_suite;
    SSL3BulkCipher bulk_cipher_alg;
    SSL3MACAlgorithm mac_alg;
    SSL3KeyExchangeAlgorithm key_exchange_alg;
    SSLHashType prf_hash;
} ssl3CipherSuiteDef;

/*
** There are tables of these, all const.
*/
typedef struct {
    /* An identifier for this struct. */
    SSL3KeyExchangeAlgorithm kea;
    /* The type of key exchange used by the cipher suite. */
    SSLKEAType exchKeyType;
    /* If the cipher suite uses a signature, the type of key used in the
     * signature. */
    KeyType signKeyType;
    /* In most cases, cipher suites depend on their signature type for
     * authentication, ECDH certificates being the exception. */
    SSLAuthType authKeyType;
    /* True if the key exchange for the suite is ephemeral.  Or to be more
     * precise: true if the ServerKeyExchange message is always required. */
    PRBool ephemeral;
    /* An OID describing the key exchange */
    SECOidTag oid;
} ssl3KEADef;

/*
** There are tables of these, all const.
*/
struct ssl3BulkCipherDefStr {
    SSL3BulkCipher cipher;
    SSLCipherAlgorithm calg;
    unsigned int key_size;
    unsigned int secret_key_size;
    CipherType type;
    unsigned int iv_size;
    unsigned int block_size;
    unsigned int tag_size;            /* for AEAD ciphers. */
    unsigned int explicit_nonce_size; /* for AEAD ciphers. */
    SECOidTag oid;
    const char *short_name;
    /* The maximum number of records that can be sent/received with the same
      * symmetric key before the connection will be terminated. */
    PRUint64 max_records;
};

/*
** There are tables of these, all const.
*/
struct ssl3MACDefStr {
    SSL3MACAlgorithm mac;
    CK_MECHANISM_TYPE mmech;
    int pad_size;
    int mac_size;
    SECOidTag oid;
};

typedef enum {
    ssl_0rtt_none,     /* 0-RTT not present */
    ssl_0rtt_sent,     /* 0-RTT sent (no decision yet) */
    ssl_0rtt_accepted, /* 0-RTT sent and accepted */
    ssl_0rtt_ignored,  /* 0-RTT sent but rejected/ignored */
    ssl_0rtt_done      /* 0-RTT accepted, but finished */
} sslZeroRttState;

typedef enum {
    ssl_0rtt_ignore_none,  /* not ignoring */
    ssl_0rtt_ignore_trial, /* ignoring with trial decryption */
    ssl_0rtt_ignore_hrr    /* ignoring until ClientHello (due to HRR) */
} sslZeroRttIgnore;

typedef enum {
    idle_handshake,
    wait_client_hello,
    wait_client_cert,
    wait_client_key,
    wait_cert_verify,
    wait_change_cipher,
    wait_finished,
    wait_server_hello,
    wait_certificate_status,
    wait_server_cert,
    wait_server_key,
    wait_cert_request,
    wait_hello_done,
    wait_new_session_ticket,
    wait_encrypted_extensions,
    wait_invalid /* Invalid value. There is no handshake message "invalid". */
} SSL3WaitState;

typedef enum {
    client_hello_initial,      /* The first attempt. */
    client_hello_retry,        /* If we receive HelloRetryRequest. */
    client_hello_retransmit,   /* In DTLS, if we receive HelloVerifyRequest. */
    client_hello_renegotiation /* A renegotiation attempt. */
} sslClientHelloType;

typedef struct SessionTicketDataStr SessionTicketData;

typedef SECStatus (*sslRestartTarget)(sslSocket *);

/*
** A DTLS queued message (potentially to be retransmitted)
*/
typedef struct DTLSQueuedMessageStr {
    PRCList link;           /* The linked list link */
    ssl3CipherSpec *cwSpec; /* The cipher spec to use, null for none */
    SSL3ContentType type;   /* The message type */
    unsigned char *data;    /* The data */
    PRUint16 len;           /* The data length */
} DTLSQueuedMessage;

typedef struct TLS13KeyShareEntryStr {
    PRCList link;                  /* The linked list link */
    const sslNamedGroupDef *group; /* The group for the entry */
    SECItem key_exchange;          /* The share itself */
} TLS13KeyShareEntry;

typedef struct TLS13EarlyDataStr {
    PRCList link; /* The linked list link */
    SECItem data; /* The data */
} TLS13EarlyData;

typedef enum {
    handshake_hash_unknown = 0,
    handshake_hash_combo = 1,  /* The MD5/SHA-1 combination */
    handshake_hash_single = 2, /* A single hash */
    handshake_hash_record
} SSL3HandshakeHashType;

/* This holds state for TLS 1.3 CertificateRequest handling. */
typedef struct TLS13CertificateRequestStr {
    PLArenaPool *arena;
    SECItem context;
    SSLSignatureScheme *signatureSchemes;
    unsigned int signatureSchemeCount;
    CERTDistNames ca_list;
} TLS13CertificateRequest;

/*
** This is the "hs" member of the "ssl3" struct.
** This entire struct is protected by ssl3HandshakeLock
*/
typedef struct SSL3HandshakeStateStr {
    SSL3Random server_random;
    SSL3Random client_random;
    SSL3WaitState ws; /* May also contain SSL3WaitState | 0x80 for TLS 1.3 */

    /* This group of members is used for handshake running hashes. */
    SSL3HandshakeHashType hashType;
    sslBuffer messages; /* Accumulated handshake messages */
    /* PKCS #11 mode:
     * SSL 3.0 - TLS 1.1 use both |md5| and |sha|. |md5| is used for MD5 and
     * |sha| for SHA-1.
     * TLS 1.2 and later use only |sha|, for SHA-256. */
    PK11Context *md5;
    PK11Context *sha;
    SSLSignatureScheme signatureScheme;
    const ssl3KEADef *kea_def;
    ssl3CipherSuite cipher_suite;
    const ssl3CipherSuiteDef *suite_def;
    SSLCompressionMethod compression;
    sslBuffer msg_body; /* protected by recvBufLock */
                        /* partial handshake message from record layer */
    unsigned int header_bytes;
    /* number of bytes consumed from handshake */
    /* message for message type and header length */
    SSL3HandshakeType msg_type;
    unsigned long msg_len;
    PRBool isResuming;  /* we are resuming (not used in TLS 1.3) */
    PRBool sendingSCSV; /* instead of empty RI */
    sslBuffer msgState; /* current state for handshake messages*/
                        /* protected by recvBufLock */

    /* The session ticket received in a NewSessionTicket message is temporarily
     * stored in newSessionTicket until the handshake is finished; then it is
     * moved to the sid.
     */
    PRBool receivedNewSessionTicket;
    NewSessionTicket newSessionTicket;

    PRUint16 finishedBytes; /* size of single finished below */
    union {
        TLSFinished tFinished[2]; /* client, then server */
        SSL3Finished sFinished[2];
        SSL3Opaque data[72];
    } finishedMsgs;

    PRBool authCertificatePending;
    /* Which function should SSL_RestartHandshake* call if we're blocked?
     * One of NULL, ssl3_SendClientSecondRound, ssl3_FinishHandshake,
     * or ssl3_AlwaysFail */
    sslRestartTarget restartTarget;
    /* Shared state between ssl3_HandleFinished and ssl3_FinishHandshake */
    PRBool cacheSID;

    PRBool canFalseStart; /* Can/did we False Start */
    /* Which preliminaryinfo values have been set. */
    PRUint32 preliminaryInfo;

    /* Parsed extensions */
    PRCList remoteExtensions; /* Parsed incoming extensions */

    /* This group of values is used for DTLS */
    PRUint16 sendMessageSeq;       /* The sending message sequence
                                    * number */
    PRCList lastMessageFlight;     /* The last message flight we
                                    * sent */
    PRUint16 maxMessageSent;       /* The largest message we sent */
    PRUint16 recvMessageSeq;       /* The receiving message sequence
                                    * number */
    sslBuffer recvdFragments;      /* The fragments we have received in
                                    * a bitmask */
    PRInt32 recvdHighWater;        /* The high water mark for fragments
                                    * received. -1 means no reassembly
                                    * in progress. */
    SECItem cookie;                /* The Hello(Retry|Verify)Request cookie. */
    PRIntervalTime rtTimerStarted; /* When the timer was started */
    DTLSTimerCb rtTimerCb;         /* The function to call on expiry */
    PRUint32 rtTimeoutMs;          /* The length of the current timeout
                                    * used for backoff (in ms) */
    PRUint32 rtRetries;            /* The retry counter */
    SECItem srvVirtName;           /* for server: name that was negotiated
                                    * with a client. For client - is
                                    * always set to NULL.*/

    /* This group of values is used for TLS 1.3 and above */
    PK11SymKey *currentSecret;            /* The secret down the "left hand side"
                                           * of the TLS 1.3 key schedule. */
    PK11SymKey *resumptionMasterSecret;   /* The resumption PSK. */
    PK11SymKey *dheSecret;                /* The (EC)DHE shared secret. */
    PK11SymKey *pskBinderKey;             /* Used to compute the PSK binder. */
    PK11SymKey *clientEarlyTrafficSecret; /* The secret we use for 0-RTT. */
    PK11SymKey *clientHsTrafficSecret;    /* The source keys for handshake */
    PK11SymKey *serverHsTrafficSecret;    /* traffic keys. */
    PK11SymKey *clientTrafficSecret;      /* The source keys for application */
    PK11SymKey *serverTrafficSecret;      /* traffic keys */
    PK11SymKey *earlyExporterSecret;      /* for 0-RTT exporters */
    PK11SymKey *exporterSecret;           /* for exporters */
    /* The certificate request from the server. */
    TLS13CertificateRequest *certificateRequest;
    PRCList cipherSpecs;            /* The cipher specs in the sequence they
                                     * will be applied. */
    sslZeroRttState zeroRttState;   /* Are we doing a 0-RTT handshake? */
    sslZeroRttIgnore zeroRttIgnore; /* Are we ignoring 0-RTT? */
    ssl3CipherSuite zeroRttSuite;   /* The cipher suite we used for 0-RTT. */
    PRCList bufferedEarlyData;      /* Buffered TLS 1.3 early data
                                     * on server.*/
    PRBool helloRetry;              /* True if HelloRetryRequest has been sent
                                     * or received. */
    ssl3KEADef kea_def_mutable;     /* Used to hold the writable kea_def
                                     * we use for TLS 1.3 */
    PRBool shortHeaders;            /* Assigned if we are doing short headers. */
} SSL3HandshakeState;

/*
** This is the "ssl3" struct, as in "ss->ssl3".
** note:
** usually,   crSpec == cwSpec and prSpec == pwSpec.
** Sometimes, crSpec == pwSpec and prSpec == cwSpec.
** But there are never more than 2 actual specs.
** No spec must ever be modified if either "current" pointer points to it.
*/
struct ssl3StateStr {

    /*
    ** The following Specs and Spec pointers must be protected using the
    ** Spec Lock.
    */
    ssl3CipherSpec *crSpec; /* current read spec. */
    ssl3CipherSpec *prSpec; /* pending read spec. */
    ssl3CipherSpec *cwSpec; /* current write spec. */
    ssl3CipherSpec *pwSpec; /* pending write spec. */

    /* Internal callback for when we do a cipher suite change. Used for
     * debugging in TLS 1.3. This can only be set by non-public functions. */
    sslCipherSpecChangedFunc changedCipherSpecFunc;
    void *changedCipherSpecArg;

    CERTCertificate *clientCertificate;   /* used by client */
    SECKEYPrivateKey *clientPrivateKey;   /* used by client */
    CERTCertificateList *clientCertChain; /* used by client */
    PRBool sendEmptyCert;                 /* used by client */

    int policy;
    /* This says what cipher suites we can do, and should
     * be either SSL_ALLOWED or SSL_RESTRICTED
     */
    PLArenaPool *peerCertArena;
    /* These are used to keep track of the peer CA */
    void *peerCertChain;
    /* chain while we are trying to validate it.   */
    CERTDistNames *ca_list;
    /* used by server.  trusted CAs for this socket. */
    PRBool initialized;
    SSL3HandshakeState hs;
    ssl3CipherSpec specs[2]; /* one is current, one is pending. */

    PRUint16 mtu; /* Our estimate of the MTU */

    /* DTLS-SRTP cipher suite preferences (if any) */
    PRUint16 dtlsSRTPCiphers[MAX_DTLS_SRTP_CIPHER_SUITES];
    PRUint16 dtlsSRTPCipherCount;
    PRBool fatalAlertSent;
    PRBool dheWeakGroupEnabled; /* used by server */
    const sslNamedGroupDef *dhePreferredGroup;

    /* TLS 1.2 introduces separate signature algorithm negotiation.
     * TLS 1.3 combined signature and hash into a single enum.
     * This is our preference order. */
    SSLSignatureScheme signatureSchemes[MAX_SIGNATURE_SCHEMES];
    unsigned int signatureSchemeCount;

    /* The version to check if we fell back from our highest version
     * of TLS. Default is 0 in which case we check against the maximum
     * configured version for this socket. Used only on the client. */
    SSL3ProtocolVersion downgradeCheckVersion;
};

/* Ethernet MTU but without subtracting the headers,
 * so slightly larger than expected */
#define DTLS_MAX_MTU 1500U
#define IS_DTLS(ss) (ss->protocolVariant == ssl_variant_datagram)

typedef struct {
    SSL3ContentType type;
    SSL3ProtocolVersion version;
    sslSequenceNumber seq_num; /* DTLS only */
    sslBuffer *buf;
} SSL3Ciphertext;

struct sslKeyPairStr {
    SECKEYPrivateKey *privKey;
    SECKEYPublicKey *pubKey;
    PRInt32 refCount; /* use PR_Atomic calls for this. */
};

typedef struct {
    PRCList link;
    const sslNamedGroupDef *group;
    sslKeyPair *keys;
} sslEphemeralKeyPair;

struct ssl3DHParamsStr {
    SSLNamedGroup name;
    SECItem prime; /* p */
    SECItem base;  /* g */
};

typedef struct SSLWrappedSymWrappingKeyStr {
    SSL3Opaque wrappedSymmetricWrappingkey[512];
    CK_MECHANISM_TYPE symWrapMechanism;
    /* unwrapped symmetric wrapping key uses this mechanism */
    CK_MECHANISM_TYPE asymWrapMechanism;
    /* mechanism used to wrap the SymmetricWrappingKey using
     * server's public and/or private keys. */
    PRInt16 wrapMechIndex;
    PRUint16 wrapKeyIndex;
    PRUint16 wrappedSymKeyLen;
} SSLWrappedSymWrappingKey;

typedef struct SessionTicketStr {
    PRUint16 ticket_version;
    SSL3ProtocolVersion ssl_version;
    ssl3CipherSuite cipher_suite;
    SSLCompressionMethod compression_method;
    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;
    const sslNamedGroupDef *namedCurve; /* For certificate lookup. */

    /*
     * msWrapMech contains a meaningful value only if ms_is_wrapped is true.
     */
    PRUint8 ms_is_wrapped;
    CK_MECHANISM_TYPE msWrapMech;
    PRUint16 ms_length;
    SSL3Opaque master_secret[48];
    PRBool extendedMasterSecretUsed;
    ClientIdentity client_identity;
    SECItem peer_cert;
    PRUint32 timestamp;
    PRUint32 flags;
    SECItem srvName; /* negotiated server name */
    SECItem alpnSelection;
} SessionTicket;

/*
 * SSL2 buffers used in SSL3.
 *     writeBuf in the SecurityInfo maintained by sslsecur.c is used
 *              to hold the data just about to be passed to the kernel
 *     sendBuf in the ConnectInfo maintained by sslcon.c is used
 *              to hold handshake messages as they are accumulated
 */

/*
** This is "ci", as in "ss->sec.ci".
**
** Protection:  All the variables in here are protected by
** firstHandshakeLock AND ssl3HandshakeLock
*/
struct sslConnectInfoStr {
    /* outgoing handshakes appended to this. */
    sslBuffer sendBuf; /*xmitBufLock*/

    PRIPv6Addr peer;
    unsigned short port;

    sslSessionID *sid;
};

/* Note: The entire content of this struct and whatever it points to gets
 * blown away by SSL_ResetHandshake().  This is "sec" as in "ss->sec".
 *
 * Unless otherwise specified below, the contents of this struct are
 * protected by firstHandshakeLock AND ssl3HandshakeLock.
 */
struct sslSecurityInfoStr {

#define SSL_ROLE(ss) (ss->sec.isServer ? "server" : "client")

    PRBool isServer;
    sslBuffer writeBuf; /*xmitBufLock*/

    CERTCertificate *localCert;
    CERTCertificate *peerCert;
    SECKEYPublicKey *peerKey;

    SSLAuthType authType;
    PRUint32 authKeyBits;
    SSLSignatureScheme signatureScheme;
    SSLKEAType keaType;
    PRUint32 keaKeyBits;
    const sslNamedGroupDef *keaGroup;
    /* The selected certificate (for servers only). */
    const sslServerCert *serverCert;

    /*
    ** Procs used for SID cache (nonce) management.
    ** Different implementations exist for clients/servers
    ** The lookup proc is only used for servers.  Baloney!
    */
    sslSessionIDCacheFunc cache;
    sslSessionIDUncacheFunc uncache;

    /* These are used during a connection handshake */
    sslConnectInfo ci;
};

/*
** SSL Socket struct
**
** Protection:  XXX
*/
struct sslSocketStr {
    PRFileDesc *fd;

    /* Pointer to operations vector for this socket */
    const sslSocketOps *ops;

    /* SSL socket options */
    sslOptions opt;
    /* Enabled version range */
    SSLVersionRange vrange;

    /* State flags */
    unsigned long clientAuthRequested;
    unsigned long delayDisabled;     /* Nagle delay disabled */
    unsigned long firstHsDone;       /* first handshake is complete. */
    unsigned long enoughFirstHsDone; /* enough of the first handshake is
                                      * done for callbacks to be able to
                                      * retrieve channel security
                                      * parameters from the SSL socket. */
    unsigned long handshakeBegun;
    unsigned long lastWriteBlocked;
    unsigned long recvdCloseNotify; /* received SSL EOF. */
    unsigned long