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/*
* Copyright (c) 2015 Proofpoint, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*/
#ifndef _TLS_H
# define _TLS_H 1
#if STARTTLS
# include <openssl/ssl.h>
# if !TLS_NO_RSA
# if _FFR_FIPSMODE
# define RSA_KEYLENGTH 1024
# else
# define RSA_KEYLENGTH 512
# endif
# endif /* !TLS_NO_RSA */
# if OPENSSL_VERSION_NUMBER >= 0x10100000L && OPENSSL_VERSION_NUMBER < 0x20000000L
# define TLS_version_num OpenSSL_version_num
# else
# define TLS_version_num SSLeay
# endif
#ifndef MTA_HAVE_TLSv1_3
/*
** HACK: if openssl can disable TLSv1_3 then "assume" it supports all
** related functions!
*/
# ifdef SSL_OP_NO_TLSv1_3
# define MTA_HAVE_TLSv1_3 1
# endif
#endif
#ifdef _DEFINE
# define EXTERN
#else
# define EXTERN extern
#endif
#if _FFR_TLS_EC && !defined(TLS_EC)
# define TLS_EC _FFR_TLS_EC
#endif
#if DANE
extern int gettlsa __P((char *, char *, STAB **, unsigned long, unsigned int, unsigned int));
# define MAX_TLSA_RR 8
# define DANE_VRFY_NONE 0 /* no TLSAs */
# define DANE_VRFY_OK 1 /* TLSA check was ok */
# define DANE_VRFY_FAIL (-1) /* TLSA check failed */
/* return values for dane_tlsa_chk() */
# define TLSA_BOGUS (-10)
# define TLSA_UNSUPP (-1)
/* note: anything >= 0 is ok and refers to the hash algorithm */
# define TLSA_IS_KNOWN(r) ((r) >= 0)
# define TLSA_IS_VALID(r) ((r) >= TLSA_UNSUPP)
struct dane_tlsa_S
{
time_t dane_tlsa_exp;
int dane_tlsa_n;
int dane_tlsa_dnsrc;
unsigned long dane_tlsa_flags;
unsigned char dane_tlsa_usage[MAX_TLSA_RR];
unsigned char dane_tlsa_selector[MAX_TLSA_RR];
unsigned char dane_tlsa_digest[MAX_TLSA_RR];
void *dane_tlsa_rr[MAX_TLSA_RR];
int dane_tlsa_len[MAX_TLSA_RR];
char *dane_tlsa_sni;
};
# define TLSAFLNONE 0x00000000
/* Dane Mode */
# define TLSAFLALWAYS 0x00000001
# define TLSAFLSECURE 0x00000002
# define DANEMODE(fl) ((fl) & 0x3)
# define TLSAFLNOEXP 0x00000010 /* do not check expiration */
# define TLSAFLADMX 0x00000100
# define TLSAFLADTLSA 0x00000200 /* currently unused */
/* could be used to replace DNSRC */
# define TLSAFLTEMP 0x00001000
/* no TLSA? -- _n == 0 */
# define TLSAFLNOTLSA 0x00002000 /* currently unused */
/*
** Do not use this record, and do not look up new TLSA RRs because
** the MX/host lookup was not secure.
** XXX: to determine: interaction with DANE=always
*/
# define TLSAFLNOADMX 0x00010000
# define TLSAFLNOADTLSA 0x00020000 /* TLSA: no AD - for DANE=always? */
# define TLSA_SET_FL(dane_tlsa, fl) (dane_tlsa)->dane_tlsa_flags |= (fl)
# define TLSA_CLR_FL(dane_tlsa, fl) (dane_tlsa)->dane_tlsa_flags &= ~(fl)
# define TLSA_IS_FL(dane_tlsa, fl) ((dane_tlsa)->dane_tlsa_flags & (fl))
# define TLSA_STORE_FL(fl) ((fl) >= TLSAFLTEMP)
# define GETTLSA(host, pste, port) gettlsa(host, NULL, pste, TLSAFLNONE, 0, port)
# define GETTLSANOX(host, pste, port) gettlsa(host, NULL, pste, TLSAFLNOEXP, 0, port)
/* values for DANE option and dane_vrfy_chk */
# define DANE_NEVER TLSAFLNONE
# define DANE_ALWAYS TLSAFLALWAYS /* NOT documented, testing... */
# define DANE_SECURE TLSAFLSECURE
# define CHK_DANE(dane) ((dane) != DANE_NEVER)
/* temp fails? others? */
# define TLSA_RR_TEMPFAIL(dane_tlsa) (((dane_tlsa) != NULL) && (dane_tlsa)->dane_tlsa_dnsrc == TRY_AGAIN)
#endif /* DANE */
/*
** TLS
*/
/* what to do in the TLS initialization */
#define TLS_I_NONE 0x00000000 /* no requirements... */
#define TLS_I_CERT_EX 0x00000001 /* cert must exist */
#define TLS_I_CERT_UNR 0x00000002 /* cert must be g/o unreadable */
#define TLS_I_KEY_EX 0x00000004 /* key must exist */
#define TLS_I_KEY_UNR 0x00000008 /* key must be g/o unreadable */
#define TLS_I_CERTP_EX 0x00000010 /* CA cert path must exist */
#define TLS_I_CERTP_UNR 0x00000020 /* CA cert path must be g/o unreadable */
#define TLS_I_CERTF_EX 0x00000040 /* CA cert file must exist */
#define TLS_I_CERTF_UNR 0x00000080 /* CA cert file must be g/o unreadable */
#define TLS_I_RSA_TMP 0x00000100 /* RSA TMP must be generated */
#define TLS_I_USE_KEY 0x00000200 /* private key must usable */
#define TLS_I_USE_CERT 0x00000400 /* certificate must be usable */
/*
not "read" anywhere
#define TLS_I_VRFY_PATH 0x00000800 * load verify path must succeed *
*/
#define TLS_I_VRFY_LOC 0x00001000 /* load verify default must succeed */
#define TLS_I_CACHE 0x00002000 /* require cache */
#define TLS_I_TRY_DH 0x00004000 /* try DH certificate */
#define TLS_I_REQ_DH 0x00008000 /* require DH certificate */
#define TLS_I_DHPAR_EX 0x00010000 /* require DH parameters */
#define TLS_I_DHPAR_UNR 0x00020000 /* DH param. must be g/o unreadable */
#define TLS_I_DH512 0x00040000 /* generate 512bit DH param */
#define TLS_I_DH1024 0x00080000 /* generate 1024bit DH param */
#define TLS_I_DH2048 0x00100000 /* generate 2048bit DH param */
#define TLS_I_NO_VRFY 0x00200000 /* do not require authentication */
#define TLS_I_KEY_OUNR 0x00400000 /* Key must be other unreadable */
#define TLS_I_CRLF_EX 0x00800000 /* CRL file must exist */
#define TLS_I_CRLF_UNR 0x01000000 /* CRL file must be g/o unreadable */
#define TLS_I_DHFIXED 0x02000000 /* use fixed DH param */
/* require server cert */
#define TLS_I_SRV_CERT (TLS_I_CERT_EX | TLS_I_KEY_EX | \
TLS_I_KEY_UNR | TLS_I_KEY_OUNR | \
TLS_I_CERTP_EX | TLS_I_CERTF_EX | \
TLS_I_USE_KEY | TLS_I_USE_CERT | TLS_I_CACHE)
/* server requirements */
#define TLS_I_SRV (TLS_I_SRV_CERT | TLS_I_RSA_TMP | /*TLS_I_VRFY_PATH|*/ \
TLS_I_VRFY_LOC | TLS_I_TRY_DH | TLS_I_CACHE)
/* client requirements */
#define TLS_I_CLT (TLS_I_KEY_UNR | TLS_I_KEY_OUNR)
#define TLS_AUTH_OK 0
#define TLS_AUTH_NO 1
#define TLS_AUTH_FAIL (-1)
# ifndef TLS_VRFY_PER_CTX
# define TLS_VRFY_PER_CTX 1
# endif
#define SM_SSL_FREE(ssl) \
do { \
if (ssl != NULL) \
{ \
SSL_free(ssl); \
ssl = NULL; \
} \
} while (0)
/* functions */
extern int endtls __P((SSL **, const char *));
extern int get_tls_se_features __P((ENVELOPE *, SSL *, tlsi_ctx_T *, bool));
extern int init_tls_library __P((bool _fipsmode));
extern bool inittls __P((SSL_CTX **, unsigned long, unsigned long, bool, char *, char *, char *, char *, char *));
extern bool initclttls __P((bool));
extern bool initsrvtls __P((bool));
extern bool load_certkey __P((SSL *, bool, char *, char *));
/* extern bool load_crlpath __P((SSL_CTX *, bool , char *)); */
extern void setclttls __P((bool));
extern int tls_get_info __P((SSL *, bool, char *, MACROS_T *, bool));
extern void tlslogerr __P((int, int, const char *));
extern void tls_set_verify __P((SSL_CTX *, SSL *, bool));
# if DANE
extern int dane_tlsa_chk __P((const char *, int, const char *, bool));
extern int dane_tlsa_clr __P((dane_tlsa_P));
extern int dane_tlsa_free __P((dane_tlsa_P));
# endif
EXTERN char *CACertPath; /* path to CA certificates (dir. with hashes) */
EXTERN char *CACertFile; /* file with CA certificate */
#if _FFR_CLIENTCA
EXTERN char *CltCACertPath; /* path to CA certificates (dir. with hashes) */
EXTERN char *CltCACertFile; /* file with CA certificate */
#endif
EXTERN char *CltCertFile; /* file with client certificate */
EXTERN char *CltKeyFile; /* file with client private key */
EXTERN char *CipherList; /* list of ciphers */
#if MTA_HAVE_TLSv1_3
EXTERN char *CipherSuites; /* cipher suites */
#endif
EXTERN char *CertFingerprintAlgorithm; /* name of fingerprint alg */
EXTERN const EVP_MD *EVP_digest; /* digest for cert fp */
EXTERN char *DHParams; /* file with DH parameters */
EXTERN char *RandFile; /* source of random data */
EXTERN char *SrvCertFile; /* file with server certificate */
EXTERN char *SrvKeyFile; /* file with server private key */
EXTERN char *CRLFile; /* file CRLs */
EXTERN char *CRLPath; /* path to CRLs (dir. with hashes) */
EXTERN unsigned long TLS_Srv_Opts; /* TLS server options */
EXTERN unsigned long Srv_SSL_Options, Clt_SSL_Options; /* SSL options */
EXTERN bool TLSFallbacktoClear;
EXTERN char *SSLEngine;
EXTERN char *SSLEnginePath;
EXTERN bool SSLEngineprefork;
# if USE_OPENSSL_ENGINE
#define TLS_set_engine(id, prefork) SSL_set_engine(id)
# else
# if !defined(OPENSSL_NO_ENGINE)
int TLS_set_engine __P((const char *, bool));
# else
#define TLS_set_engine(id, prefork) 1
# endif
# endif
extern int set_tls_rd_tmo __P((int));
extern int data2hex __P((unsigned char *, int, unsigned char *, int));
# if DANE
extern int pubkey_fp __P((X509 *, const char*, char **));
extern dane_tlsa_P dane_get_tlsa __P((dane_vrfy_ctx_P));
# endif
#else /* STARTTLS */
# define set_tls_rd_tmo(rd_tmo) 0
#endif /* STARTTLS */
#undef EXTERN
#endif /* ! _TLS_H */
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