Adding upstream version 3.7.10.upstream/3.7.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 728 insertions, 0 deletions

diff --git a/src/tls/tls.h b/src/tls/tls.h
new file mode 100644
index 0000000..b1fdfea
--- /dev/null
+++ b/src/tls/tls.h
@@ -0,0 +1,728 @@
+#ifndef _TLS_H_INCLUDED_
+#define _TLS_H_INCLUDED_
+
+/*++
+/* NAME
+/*	tls 3h
+/* SUMMARY
+/*	libtls internal interfaces
+/* SYNOPSIS
+/*	#include <tls.h>
+/* DESCRIPTION
+/* .nf
+
+ /*
+  * Utility library.
+  */
+#include <name_code.h>
+#include <argv.h>
+
+ /*
+  * TLS enforcement levels. Non-sentinel values may also be used to indicate
+  * the actual security level of a session.
+  * 
+  * XXX TLS_LEV_NOTFOUND no longer belongs in this list. The SMTP client will
+  * have to use something else to report that policy table lookup failed.
+  * 
+  * The order of levels matters, but we hide most of the details in macros.
+  * 
+  * "dane" vs. "fingerprint", both must lie between "encrypt" and "verify".
+  * 
+  * - With "may" and higher, TLS is enabled.
+  * 
+  * - With "encrypt" and higher, TLS encryption must be applied.
+  * 
+  * - Strictly above "encrypt", the peer certificate must match.
+  * 
+  * - At "dane" and higher, the peer certificate must also be trusted. With
+  * "dane" the trust may be self-asserted, so we only log trust verification
+  * errors when TA associations are involved.
+  */
+#define TLS_LEV_INVALID		-2	/* sentinel */
+#define TLS_LEV_NOTFOUND	-1	/* XXX not in policy table */
+#define TLS_LEV_NONE		0	/* plain-text only */
+#define TLS_LEV_MAY		1	/* wildcard */
+#define TLS_LEV_ENCRYPT		2	/* encrypted connection */
+#define TLS_LEV_FPRINT		3	/* "peer" CA-less verification */
+#define TLS_LEV_HALF_DANE	4	/* DANE TLSA MX host, insecure MX RR */
+#define TLS_LEV_DANE		5	/* Opportunistic TLSA policy */
+#define TLS_LEV_DANE_ONLY	6	/* Required TLSA policy */
+#define TLS_LEV_VERIFY		7	/* certificate verified */
+#define TLS_LEV_SECURE		8	/* "secure" verification */
+
+#define TLS_REQUIRED(l)		((l) > TLS_LEV_MAY)
+#define TLS_MUST_MATCH(l)	((l) > TLS_LEV_ENCRYPT)
+#define TLS_MUST_PKIX(l)	((l) >= TLS_LEV_VERIFY)
+#define TLS_OPPORTUNISTIC(l)	((l) == TLS_LEV_MAY || (l) == TLS_LEV_DANE)
+#define TLS_DANE_BASED(l)	\
+	((l) >= TLS_LEV_HALF_DANE && (l) <= TLS_LEV_DANE_ONLY)
+#define TLS_NEVER_SECURED(l)	((l) == TLS_LEV_HALF_DANE)
+
+extern int tls_level_lookup(const char *);
+extern const char *str_tls_level(int);
+
+#ifdef USE_TLS
+
+ /*
+  * OpenSSL library.
+  */
+#include <openssl/lhash.h>
+#include <openssl/bn.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/x509.h>
+#include <openssl/x509v3.h>
+#include <openssl/rand.h>
+#include <openssl/crypto.h>		/* Legacy SSLEAY_VERSION_NUMBER */
+#include <openssl/evp.h>		/* New OpenSSL 3.0 EVP_PKEY APIs */
+#include <openssl/opensslv.h>		/* OPENSSL_VERSION_NUMBER */
+#include <openssl/ssl.h>
+#include <openssl/conf.h>
+
+ /* Appease indent(1) */
+#define x509_stack_t STACK_OF(X509)
+#define general_name_stack_t STACK_OF(GENERAL_NAME)
+#define ssl_cipher_stack_t STACK_OF(SSL_CIPHER)
+#define ssl_comp_stack_t STACK_OF(SSL_COMP)
+
+/*-
+ * Official way to check minimum OpenSSL API version from 3.0 onward.
+ * We simply define it false for all prior versions, where we typically also
+ * need the patch level to determine API compatibility.
+ */
+#ifndef OPENSSL_VERSION_PREREQ
+#define OPENSSL_VERSION_PREREQ(m,n) 0
+#endif
+
+#if (OPENSSL_VERSION_NUMBER < 0x1010100fUL)
+#error "OpenSSL releases prior to 1.1.1 are no longer supported"
+#endif
+
+ /*-
+  * Backwards compatibility with OpenSSL < 1.1.1a.
+  *
+  * In OpenSSL 1.1.1a the client-only interface SSL_get_server_tmp_key() was
+  * updated to work on both the client and the server, and was renamed to
+  * SSL_get_peer_tmp_key(), with the original name left behind as an alias.  We
+  * use the new name when available.
+  */
+#if OPENSSL_VERSION_NUMBER < 0x1010101fUL
+#undef SSL_get_signature_nid
+#define SSL_get_signature_nid(ssl, pnid) (NID_undef)
+#define tls_get_peer_dh_pubkey SSL_get_server_tmp_key
+#else
+#define tls_get_peer_dh_pubkey SSL_get_peer_tmp_key
+#endif
+
+#if OPENSSL_VERSION_PREREQ(3,0)
+#define TLS_PEEK_PEER_CERT(ssl) SSL_get0_peer_certificate(ssl)
+#define TLS_FREE_PEER_CERT(x)   ((void) 0)
+#define tls_set_bio_callback    BIO_set_callback_ex
+#else
+#define TLS_PEEK_PEER_CERT(ssl) SSL_get_peer_certificate(ssl)
+#define TLS_FREE_PEER_CERT(x)   X509_free(x)
+#define tls_set_bio_callback    BIO_set_callback
+#endif
+
+ /*
+  * Utility library.
+  */
+#include <vstream.h>
+#include <name_mask.h>
+#include <name_code.h>
+
+ /*
+  * TLS library.
+  */
+#include <dns.h>
+
+ /*
+  * TLS role, presently for logging.
+  */
+typedef enum {
+    TLS_ROLE_CLIENT, TLS_ROLE_SERVER,
+} TLS_ROLE;
+
+typedef enum {
+    TLS_USAGE_NEW, TLS_USAGE_USED,
+} TLS_USAGE;
+
+ /*
+  * Names of valid tlsmgr(8) session caches.
+  */
+#define TLS_MGR_SCACHE_SMTPD	"smtpd"
+#define TLS_MGR_SCACHE_SMTP	"smtp"
+#define TLS_MGR_SCACHE_LMTP	"lmtp"
+
+ /*
+  * RFC 6698, 7671, 7672 DANE
+  */
+#define TLS_DANE_TA	0		/* Match trust-anchor digests */
+#define TLS_DANE_EE	1		/* Match end-entity digests */
+
+#define TLS_DANE_CERT	0		/* Match the certificate digest */
+#define TLS_DANE_PKEY	1		/* Match the public key digest */
+
+#define TLS_DANE_FLAG_NORRS	(1<<0)	/* Nothing found in DNS */
+#define TLS_DANE_FLAG_EMPTY	(1<<1)	/* Nothing usable found in DNS */
+#define TLS_DANE_FLAG_ERROR	(1<<2)	/* TLSA record lookup error */
+
+#define tls_dane_unusable(dane)	((dane)->flags & TLS_DANE_FLAG_EMPTY)
+#define tls_dane_notfound(dane)	((dane)->flags & TLS_DANE_FLAG_NORRS)
+
+#define TLS_DANE_CACHE_TTL_MIN 1	/* A lot can happen in ~2 seconds */
+#define TLS_DANE_CACHE_TTL_MAX 100	/* Comparable to max_idle */
+
+ /*
+  * Certificate and public key digests (typically from TLSA RRs), grouped by
+  * algorithm.
+  */
+typedef struct TLS_TLSA {
+    uint8_t usage;			/* DANE certificate usage */
+    uint8_t selector;			/* DANE selector */
+    uint8_t mtype;			/* Algorithm for this digest list */
+    uint16_t length;			/* Length of associated data */
+    unsigned char *data;		/* Associated data */
+    struct TLS_TLSA *next;		/* Chain to next algorithm */
+} TLS_TLSA;
+
+typedef struct TLS_DANE {
+    TLS_TLSA *tlsa;			/* TLSA records */
+    char   *base_domain;		/* Base domain of TLSA RRset */
+    int     flags;			/* Lookup status */
+    time_t  expires;			/* Expiration time of this record */
+    int     refs;			/* Reference count */
+} TLS_DANE;
+
+ /*
+  * tls_dane.c
+  */
+extern int tls_dane_avail(void);
+extern void tls_dane_loglevel(const char *, const char *);
+extern void tls_dane_flush(void);
+extern TLS_DANE *tls_dane_alloc(void);
+extern void tls_tlsa_free(TLS_TLSA *);
+extern void tls_dane_free(TLS_DANE *);
+extern void tls_dane_add_fpt_digests(TLS_DANE *, const char *, const char *,
+				             int);
+extern TLS_DANE *tls_dane_resolve(unsigned, const char *, DNS_RR *, int);
+extern int tls_dane_load_trustfile(TLS_DANE *, const char *);
+
+ /*
+  * TLS session context, also used by the VSTREAM call-back routines for SMTP
+  * input/output, and by OpenSSL call-back routines for key verification.
+  * 
+  * Only some members are (read-only) accessible by the public.
+  */
+#define CCERT_BUFSIZ	256
+
+typedef struct {
+    /* Public, read-only. */
+    char   *peer_CN;			/* Peer Common Name */
+    char   *issuer_CN;			/* Issuer Common Name */
+    char   *peer_sni;			/* SNI sent to or by the peer */
+    char   *peer_cert_fprint;		/* ASCII certificate fingerprint */
+    char   *peer_pkey_fprint;		/* ASCII public key fingerprint */
+    int     level;			/* Effective security level */
+    int     peer_status;		/* Certificate and match status */
+    const char *protocol;
+    const char *cipher_name;
+    int     cipher_usebits;
+    int     cipher_algbits;
+    const char *kex_name;		/* shared key-exchange algorithm */
+    const char *kex_curve;		/* shared key-exchange ECDHE curve */
+    int     kex_bits;			/* shared FFDHE key exchange bits */
+    const char *clnt_sig_name;		/* client's signature key algorithm */
+    const char *clnt_sig_curve;		/* client's ECDSA curve name */
+    int     clnt_sig_bits;		/* client's RSA signature key bits */
+    const char *clnt_sig_dgst;		/* client's signature digest */
+    const char *srvr_sig_name;		/* server's signature key algorithm */
+    const char *srvr_sig_curve;		/* server's ECDSA curve name */
+    int     srvr_sig_bits;		/* server's RSA signature key bits */
+    const char *srvr_sig_dgst;		/* server's signature digest */
+    /* Private. */
+    SSL    *con;
+    char   *cache_type;			/* tlsmgr(8) cache type if enabled */
+    int     ticketed;			/* Session ticket issued */
+    char   *serverid;			/* unique server identifier */
+    char   *namaddr;			/* nam[addr] for logging */
+    int     log_mask;			/* What to log */
+    int     session_reused;		/* this session was reused */
+    int     am_server;			/* Are we an SSL server or client? */
+    const char *mdalg;			/* default message digest algorithm */
+    /* Built-in vs external SSL_accept/read/write/shutdown support. */
+    VSTREAM *stream;			/* Blocking-mode SMTP session */
+    /* DANE TLSA trust input and verification state */
+    const TLS_DANE *dane;		/* DANE TLSA digests */
+    X509   *errorcert;			/* Error certificate closest to leaf */
+    int     errordepth;			/* Chain depth of error cert */
+    int     errorcode;			/* First error at error depth */
+    int     must_fail;			/* Failed to load trust settings */
+} TLS_SESS_STATE;
+
+ /*
+  * Peer status bits. TLS_CERT_FLAG_MATCHED implies TLS_CERT_FLAG_TRUSTED
+  * only in the case of a hostname match.
+  */
+#define TLS_CERT_FLAG_PRESENT		(1<<0)
+#define TLS_CERT_FLAG_ALTNAME		(1<<1)
+#define TLS_CERT_FLAG_TRUSTED		(1<<2)
+#define TLS_CERT_FLAG_MATCHED		(1<<3)
+#define TLS_CERT_FLAG_SECURED		(1<<4)
+
+#define TLS_CERT_IS_PRESENT(c) ((c) && ((c)->peer_status&TLS_CERT_FLAG_PRESENT))
+#define TLS_CERT_IS_ALTNAME(c) ((c) && ((c)->peer_status&TLS_CERT_FLAG_ALTNAME))
+#define TLS_CERT_IS_TRUSTED(c) ((c) && ((c)->peer_status&TLS_CERT_FLAG_TRUSTED))
+#define TLS_CERT_IS_MATCHED(c) ((c) && ((c)->peer_status&TLS_CERT_FLAG_MATCHED))
+#define TLS_CERT_IS_SECURED(c) ((c) && ((c)->peer_status&TLS_CERT_FLAG_SECURED))
+
+ /*
+  * Opaque client context handle.
+  */
+typedef struct TLS_APPL_STATE TLS_APPL_STATE;
+
+#ifdef TLS_INTERNAL
+
+ /*
+  * Log mask details are internal to the library.
+  */
+extern int tls_log_mask(const char *, const char *);
+
+ /*
+  * What to log.
+  */
+#define TLS_LOG_NONE			(1<<0)
+#define TLS_LOG_SUMMARY			(1<<1)
+#define TLS_LOG_UNTRUSTED		(1<<2)
+#define TLS_LOG_PEERCERT		(1<<3)
+#define TLS_LOG_CERTMATCH		(1<<4)
+#define TLS_LOG_VERBOSE			(1<<5)
+#define TLS_LOG_CACHE			(1<<6)
+#define TLS_LOG_DEBUG			(1<<7)
+#define TLS_LOG_TLSPKTS			(1<<8)
+#define TLS_LOG_ALLPKTS			(1<<9)
+#define TLS_LOG_DANE			(1<<10)
+
+ /*
+  * Client and Server application contexts
+  */
+struct TLS_APPL_STATE {
+    SSL_CTX *ssl_ctx;
+    SSL_CTX *sni_ctx;
+    int     log_mask;
+    char   *cache_type;
+};
+
+ /*
+  * tls_misc.c Application-context update and disposal.
+  */
+extern void tls_update_app_logmask(TLS_APPL_STATE *, int);
+extern void tls_free_app_context(TLS_APPL_STATE *);
+
+ /*
+  * tls_misc.c
+  */
+extern void tls_param_init(void);
+extern int tls_library_init(void);
+
+ /*
+  * Protocol selection.
+  */
+#define TLS_PROTOCOL_INVALID	(~0)	/* All protocol bits masked */
+
+#ifdef SSL_TXT_SSLV2
+#define TLS_PROTOCOL_SSLv2	(1<<0)	/* SSLv2 */
+#else
+#define SSL_TXT_SSLV2		"SSLv2"
+#define TLS_PROTOCOL_SSLv2	0	/* Unknown */
+#undef  SSL_OP_NO_SSLv2
+#define SSL_OP_NO_SSLv2		0L	/* Noop */
+#endif
+
+#ifdef SSL_TXT_SSLV3
+#define TLS_PROTOCOL_SSLv3	(1<<1)	/* SSLv3 */
+#else
+#define SSL_TXT_SSLV3		"SSLv3"
+#define TLS_PROTOCOL_SSLv3	0	/* Unknown */
+#undef  SSL_OP_NO_SSLv3
+#define SSL_OP_NO_SSLv3		0L	/* Noop */
+#endif
+
+#ifdef SSL_TXT_TLSV1
+#define TLS_PROTOCOL_TLSv1	(1<<2)	/* TLSv1 */
+#else
+#define SSL_TXT_TLSV1		"TLSv1"
+#define TLS_PROTOCOL_TLSv1	0	/* Unknown */
+#undef  SSL_OP_NO_TLSv1
+#define SSL_OP_NO_TLSv1		0L	/* Noop */
+#endif
+
+#ifdef SSL_TXT_TLSV1_1
+#define TLS_PROTOCOL_TLSv1_1	(1<<3)	/* TLSv1_1 */
+#else
+#define SSL_TXT_TLSV1_1		"TLSv1.1"
+#define TLS_PROTOCOL_TLSv1_1	0	/* Unknown */
+#undef  SSL_OP_NO_TLSv1_1
+#define SSL_OP_NO_TLSv1_1	0L	/* Noop */
+#endif
+
+#ifdef SSL_TXT_TLSV1_2
+#define TLS_PROTOCOL_TLSv1_2	(1<<4)	/* TLSv1_2 */
+#else
+#define SSL_TXT_TLSV1_2		"TLSv1.2"
+#define TLS_PROTOCOL_TLSv1_2	0	/* Unknown */
+#undef  SSL_OP_NO_TLSv1_2
+#define SSL_OP_NO_TLSv1_2	0L	/* Noop */
+#endif
+
+ /*
+  * OpenSSL 1.1.1 does not define a TXT macro for TLS 1.3, so we roll our
+  * own.
+  */
+#define TLS_PROTOCOL_TXT_TLSV1_3	"TLSv1.3"
+
+#if defined(TLS1_3_VERSION) && defined(SSL_OP_NO_TLSv1_3)
+#define TLS_PROTOCOL_TLSv1_3	(1<<5)	/* TLSv1_3 */
+#else
+#define TLS_PROTOCOL_TLSv1_3	0	/* Unknown */
+#undef  SSL_OP_NO_TLSv1_3
+#define SSL_OP_NO_TLSv1_3	0L	/* Noop */
+#endif
+
+/*
+ * Always used when defined, SMTP has no truncation attacks.
+ */
+#ifndef SSL_OP_IGNORE_UNEXPECTED_EOF
+#define SSL_OP_IGNORE_UNEXPECTED_EOF    0L
+#endif
+
+#define TLS_KNOWN_PROTOCOLS \
+	( TLS_PROTOCOL_SSLv2 | TLS_PROTOCOL_SSLv3 | TLS_PROTOCOL_TLSv1 \
+	   | TLS_PROTOCOL_TLSv1_1 | TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3 )
+#define TLS_SSL_OP_PROTOMASK(m) \
+	    ((((m) & TLS_PROTOCOL_SSLv2) ? SSL_OP_NO_SSLv2 : 0L) \
+	     | (((m) & TLS_PROTOCOL_SSLv3) ? SSL_OP_NO_SSLv3 : 0L) \
+	     | (((m) & TLS_PROTOCOL_TLSv1) ? SSL_OP_NO_TLSv1 : 0L) \
+	     | (((m) & TLS_PROTOCOL_TLSv1_1) ? SSL_OP_NO_TLSv1_1 : 0L) \
+	     | (((m) & TLS_PROTOCOL_TLSv1_2) ? SSL_OP_NO_TLSv1_2 : 0L) \
+	     | (((m) & TLS_PROTOCOL_TLSv1_3) ? SSL_OP_NO_TLSv1_3 : 0L))
+
+/*
+ * SSL options that are managed via dedicated Postfix features, rather than
+ * just exposed via hex codes or named elements of tls_ssl_options.
+ */
+#define TLS_SSL_OP_MANAGED_BITS \
+	(SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_IGNORE_UNEXPECTED_EOF | \
+	 TLS_SSL_OP_PROTOMASK(~0))
+
+extern int tls_proto_mask_lims(const char *, int *, int *);
+
+ /*
+  * Cipher grade selection.
+  */
+#define TLS_CIPHER_NONE		0
+#define TLS_CIPHER_NULL		1
+#define TLS_CIPHER_EXPORT	2
+#define TLS_CIPHER_LOW		3
+#define TLS_CIPHER_MEDIUM	4
+#define TLS_CIPHER_HIGH		5
+
+extern const NAME_CODE tls_cipher_grade_table[];
+
+#define tls_cipher_grade(str) \
+    name_code(tls_cipher_grade_table, NAME_CODE_FLAG_NONE, (str))
+#define str_tls_cipher_grade(gr) \
+    str_name_code(tls_cipher_grade_table, (gr))
+
+ /*
+  * Cipher lists with exclusions.
+  */
+extern const char *tls_set_ciphers(TLS_SESS_STATE *, const char *,
+				           const char *);
+
+ /*
+  * Populate TLS context with TLS 1.3-related signature parameters.
+  */
+extern void tls_get_signature_params(TLS_SESS_STATE *);
+
+#endif					/* TLS_INTERNAL */
+
+ /*
+  * tls_client.c
+  */
+typedef struct {
+    const char *log_param;
+    const char *log_level;
+    int     verifydepth;
+    const char *cache_type;
+    const char *chain_files;
+    const char *cert_file;
+    const char *key_file;
+    const char *dcert_file;
+    const char *dkey_file;
+    const char *eccert_file;
+    const char *eckey_file;
+    const char *CAfile;
+    const char *CApath;
+    const char *mdalg;			/* default message digest algorithm */
+} TLS_CLIENT_INIT_PROPS;
+
+typedef struct {
+    TLS_APPL_STATE *ctx;
+    VSTREAM *stream;
+    int     fd;				/* Event-driven file descriptor */
+    int     timeout;
+    int     tls_level;			/* Security level */
+    const char *nexthop;		/* destination domain */
+    const char *host;			/* MX hostname */
+    const char *namaddr;		/* nam[addr] for logging */
+    const char *sni;			/* optional SNI name when not DANE */
+    const char *serverid;		/* Session cache key */
+    const char *helo;			/* Server name from EHLO response */
+    const char *protocols;		/* Enabled protocols */
+    const char *cipher_grade;		/* Minimum cipher grade */
+    const char *cipher_exclusions;	/* Ciphers to exclude */
+    const ARGV *matchargv;		/* Cert match patterns */
+    const char *mdalg;			/* default message digest algorithm */
+    const TLS_DANE *dane;		/* DANE TLSA verification */
+} TLS_CLIENT_START_PROPS;
+
+extern TLS_APPL_STATE *tls_client_init(const TLS_CLIENT_INIT_PROPS *);
+extern TLS_SESS_STATE *tls_client_start(const TLS_CLIENT_START_PROPS *);
+extern TLS_SESS_STATE *tls_client_post_connect(TLS_SESS_STATE *,
+				            const TLS_CLIENT_START_PROPS *);
+
+#define tls_client_stop(ctx, stream, timeout, failure, TLScontext) \
+	tls_session_stop(ctx, (stream), (timeout), (failure), (TLScontext))
+
+#define TLS_CLIENT_INIT_ARGS(props, a1, a2, a3, a4, a5, a6, a7, a8, a9, \
+    a10, a11, a12, a13, a14) \
+    (((props)->a1), ((props)->a2), ((props)->a3), \
+    ((props)->a4), ((props)->a5), ((props)->a6), ((props)->a7), \
+    ((props)->a8), ((props)->a9), ((props)->a10), ((props)->a11), \
+    ((props)->a12), ((props)->a13), ((props)->a14), (props))
+
+#define TLS_CLIENT_INIT(props, a1, a2, a3, a4, a5, a6, a7, a8, a9, \
+    a10, a11, a12, a13, a14) \
+    tls_client_init(TLS_CLIENT_INIT_ARGS(props, a1, a2, a3, a4, a5, \
+    a6, a7, a8, a9, a10, a11, a12, a13, a14))
+
+#define TLS_CLIENT_START(props, a1, a2, a3, a4, a5, a6, a7, a8, a9, \
+    a10, a11, a12, a13, a14, a15, a16, a17) \
+    tls_client_start((((props)->a1), ((props)->a2), ((props)->a3), \
+    ((props)->a4), ((props)->a5), ((props)->a6), ((props)->a7), \
+    ((props)->a8), ((props)->a9), ((props)->a10), ((props)->a11), \
+    ((props)->a12), ((props)->a13), ((props)->a14), ((props)->a15), \
+    ((props)->a16), ((props)->a17), (props)))
+
+ /*
+  * tls_server.c
+  */
+typedef struct {
+    const char *log_param;
+    const char *log_level;
+    int     verifydepth;
+    const char *cache_type;
+    int     set_sessid;
+    const char *chain_files;
+    const char *cert_file;
+    const char *key_file;
+    const char *dcert_file;
+    const char *dkey_file;
+    const char *eccert_file;
+    const char *eckey_file;
+    const char *CAfile;
+    const char *CApath;
+    const char *protocols;
+    const char *eecdh_grade;
+    const char *dh1024_param_file;
+    const char *dh512_param_file;
+    int     ask_ccert;
+    const char *mdalg;			/* default message digest algorithm */
+} TLS_SERVER_INIT_PROPS;
+
+typedef struct {
+    TLS_APPL_STATE *ctx;		/* TLS application context */
+    VSTREAM *stream;			/* Client stream */
+    int     fd;				/* Event-driven file descriptor */
+    int     timeout;			/* TLS handshake timeout */
+    int     requirecert;		/* Insist on client cert? */
+    const char *serverid;		/* Server instance (salt cache key) */
+    const char *namaddr;		/* Client nam[addr] for logging */
+    const char *cipher_grade;
+    const char *cipher_exclusions;
+    const char *mdalg;			/* default message digest algorithm */
+} TLS_SERVER_START_PROPS;
+
+extern TLS_APPL_STATE *tls_server_init(const TLS_SERVER_INIT_PROPS *);
+extern TLS_SESS_STATE *tls_server_start(const TLS_SERVER_START_PROPS *props);
+extern TLS_SESS_STATE *tls_server_post_accept(TLS_SESS_STATE *);
+
+#define tls_server_stop(ctx, stream, timeout, failure, TLScontext) \
+	tls_session_stop(ctx, (stream), (timeout), (failure), (TLScontext))
+
+#define TLS_SERVER_INIT(props, a1, a2, a3, a4, a5, a6, a7, a8, a9, \
+    a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) \
+    tls_server_init((((props)->a1), ((props)->a2), ((props)->a3), \
+    ((props)->a4), ((props)->a5), ((props)->a6), ((props)->a7), \
+    ((props)->a8), ((props)->a9), ((props)->a10), ((props)->a11), \
+    ((props)->a12), ((props)->a13), ((props)->a14), ((props)->a15), \
+    ((props)->a16), ((props)->a17), ((props)->a18), ((props)->a19), \
+    ((props)->a20), (props)))
+
+#define TLS_SERVER_START(props, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) \
+    tls_server_start((((props)->a1), ((props)->a2), ((props)->a3), \
+    ((props)->a4), ((props)->a5), ((props)->a6), ((props)->a7), \
+    ((props)->a8), ((props)->a9), ((props)->a10), (props)))
+
+ /*
+  * tls_session.c
+  */
+extern void tls_session_stop(TLS_APPL_STATE *, VSTREAM *, int, int, TLS_SESS_STATE *);
+
+ /*
+  * tls_misc.c
+  */
+extern const char *tls_compile_version(void);
+extern const char *tls_run_version(void);
+extern const char **tls_pkey_algorithms(void);
+extern void tls_log_summary(TLS_ROLE, TLS_USAGE, TLS_SESS_STATE *);
+extern void tls_pre_jail_init(TLS_ROLE);
+
+#ifdef TLS_INTERNAL
+
+#include <vstring.h>
+
+extern VSTRING *tls_session_passivate(SSL_SESSION *);
+extern SSL_SESSION *tls_session_activate(const char *, int);
+
+ /*
+  * tls_stream.c.
+  */
+extern void tls_stream_start(VSTREAM *, TLS_SESS_STATE *);
+extern void tls_stream_stop(VSTREAM *);
+
+ /*
+  * tls_bio_ops.c: a generic multi-personality driver that retries SSL
+  * operations until they are satisfied or until a hard error happens.
+  * Because of its ugly multi-personality user interface we invoke it via
+  * not-so-ugly single-personality wrappers.
+  */
+extern int tls_bio(int, int, TLS_SESS_STATE *,
+		           int (*) (SSL *),	/* handshake */
+		           int (*) (SSL *, void *, int),	/* read */
+		           int (*) (SSL *, const void *, int),	/* write */
+		           void *, int);
+
+#define tls_bio_connect(fd, timeout, context) \
+        tls_bio((fd), (timeout), (context), SSL_connect, \
+		NULL, NULL, NULL, 0)
+#define tls_bio_accept(fd, timeout, context) \
+        tls_bio((fd), (timeout), (context), SSL_accept, \
+		NULL, NULL, NULL, 0)
+#define tls_bio_shutdown(fd, timeout, context) \
+	tls_bio((fd), (timeout), (context), SSL_shutdown, \
+		NULL, NULL, NULL, 0)
+#define tls_bio_read(fd, buf, len, timeout, context) \
+	tls_bio((fd), (timeout), (context), NULL, \
+		SSL_read, NULL, (buf), (len))
+#define tls_bio_write(fd, buf, len, timeout, context) \
+	tls_bio((fd), (timeout), (context), NULL, \
+		NULL, SSL_write, (buf), (len))
+
+ /*
+  * tls_dh.c
+  */
+extern void tls_set_dh_from_file(const char *);
+extern void tls_tmp_dh(SSL_CTX *, int);
+extern void tls_auto_eecdh_curves(SSL_CTX *, const char *);
+
+ /*
+  * tls_verify.c
+  */
+extern char *tls_peer_CN(X509 *, const TLS_SESS_STATE *);
+extern char *tls_issuer_CN(X509 *, const TLS_SESS_STATE *);
+extern int tls_verify_certificate_callback(int, X509_STORE_CTX *);
+extern void tls_log_verify_error(TLS_SESS_STATE *);
+
+ /*
+  * tls_dane.c
+  */
+extern void tls_dane_log(TLS_SESS_STATE *);
+extern void tls_dane_digest_init(SSL_CTX *, const EVP_MD *);
+extern int tls_dane_enable(TLS_SESS_STATE *);
+extern TLS_TLSA *tlsa_prepend(TLS_TLSA *, uint8_t, uint8_t, uint8_t,
+			              const unsigned char *, uint16_t);
+
+ /*
+  * tls_fprint.c
+  */
+extern const EVP_MD *tls_digest_byname(const char *, EVP_MD_CTX **);
+extern char *tls_digest_encode(const unsigned char *, int);
+extern char *tls_cert_fprint(X509 *, const char *);
+extern char *tls_pkey_fprint(X509 *, const char *);
+extern char *tls_serverid_digest(TLS_SESS_STATE *,
+		              const TLS_CLIENT_START_PROPS *, const char *);
+
+ /*
+  * tls_certkey.c
+  */
+extern int tls_set_ca_certificate_info(SSL_CTX *, const char *, const char *);
+extern int tls_load_pem_chain(SSL *, const char *, const char *);
+extern int tls_set_my_certificate_key_info(SSL_CTX *, /* All */ const char *,
+				       /* RSA */ const char *, const char *,
+				       /* DSA */ const char *, const char *,
+				    /* ECDSA */ const char *, const char *);
+
+ /*
+  * tls_misc.c
+  */
+extern int TLScontext_index;
+
+extern TLS_APPL_STATE *tls_alloc_app_context(SSL_CTX *, SSL_CTX *, int);
+extern TLS_SESS_STATE *tls_alloc_sess_context(int, const char *);
+extern void tls_free_context(TLS_SESS_STATE *);
+extern void tls_check_version(void);
+extern long tls_bug_bits(void);
+extern void tls_print_errors(void);
+extern void tls_info_callback(const SSL *, int, int);
+
+#if OPENSSL_VERSION_PREREQ(3,0)
+extern long tls_bio_dump_cb(BIO *, int, const char *, size_t, int, long,
+			            int, size_t *);
+
+#else
+extern long tls_bio_dump_cb(BIO *, int, const char *, int, long, long);
+
+#endif
+extern const EVP_MD *tls_validate_digest(const char *);
+
+ /*
+  * tls_seed.c
+  */
+extern void tls_int_seed(void);
+extern int tls_ext_seed(int);
+
+#endif					/* TLS_INTERNAL */
+
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*
+/*	Victor Duchovni
+/*	Morgan Stanley
+/*--*/
+
+#endif					/* USE_TLS */
+#endif					/* _TLS_H_INCLUDED_ */