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/* Copyright (c) 2010-2011, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DKIM_H_
#define DKIM_H_
#include "config.h"
#include "event.h"
#include "dns.h"
#ifdef HAVE_OPENSSL
#include <openssl/rsa.h>
#include <openssl/engine.h>
#endif
/* Main types and definitions */
#define DKIM_SIGNHEADER "DKIM-Signature"
/* DKIM signature header */
/* special DNS tokens */
#define DKIM_DNSKEYNAME "_domainkey"
/* reserved DNS sub-zone */
#define DKIM_DNSPOLICYNAME "_adsp" /* reserved DNS sub-zone */
/* Canonization methods */
#define DKIM_CANON_UNKNOWN (-1) /* unknown method */
#define DKIM_CANON_SIMPLE 0 /* as specified in DKIM spec */
#define DKIM_CANON_RELAXED 1 /* as specified in DKIM spec */
#define DKIM_CANON_DEFAULT DKIM_CANON_SIMPLE
/* Signature methods */
#define DKIM_SIGN_UNKNOWN (-2) /* unknown method */
#define DKIM_SIGN_DEFAULT (-1) /* use internal default */
#define DKIM_SIGN_RSASHA1 0 /* an RSA-signed SHA1 digest */
#define DKIM_SIGN_RSASHA256 1 /* an RSA-signed SHA256 digest */
/* Params */
#define DKIM_PARAM_UNKNOWN (-1) /* unknown */
#define DKIM_PARAM_SIGNATURE 0 /* b */
#define DKIM_PARAM_SIGNALG 1 /* a */
#define DKIM_PARAM_DOMAIN 2 /* d */
#define DKIM_PARAM_CANONALG 3 /* c */
#define DKIM_PARAM_QUERYMETHOD 4 /* q */
#define DKIM_PARAM_SELECTOR 5 /* s */
#define DKIM_PARAM_HDRLIST 6 /* h */
#define DKIM_PARAM_VERSION 7 /* v */
#define DKIM_PARAM_IDENTITY 8 /* i */
#define DKIM_PARAM_TIMESTAMP 9 /* t */
#define DKIM_PARAM_EXPIRATION 10 /* x */
#define DKIM_PARAM_COPIEDHDRS 11 /* z */
#define DKIM_PARAM_BODYHASH 12 /* bh */
#define DKIM_PARAM_BODYLENGTH 13 /* l */
/* Errors (from OpenDKIM) */
#define DKIM_SIGERROR_UNKNOWN (-1) /* unknown error */
#define DKIM_SIGERROR_OK 0 /* no error */
#define DKIM_SIGERROR_VERSION 1 /* unsupported version */
#define DKIM_SIGERROR_DOMAIN 2 /* invalid domain (d=/i=) */
#define DKIM_SIGERROR_EXPIRED 3 /* signature expired */
#define DKIM_SIGERROR_FUTURE 4 /* signature in the future */
#define DKIM_SIGERROR_TIMESTAMPS 5 /* x= < t= */
#define DKIM_SIGERROR_UNUSED 6 /* OBSOLETE */
#define DKIM_SIGERROR_INVALID_HC 7 /* c= invalid (header) */
#define DKIM_SIGERROR_INVALID_BC 8 /* c= invalid (body) */
#define DKIM_SIGERROR_MISSING_A 9 /* a= missing */
#define DKIM_SIGERROR_INVALID_A 10 /* a= invalid */
#define DKIM_SIGERROR_MISSING_H 11 /* h= missing */
#define DKIM_SIGERROR_INVALID_L 12 /* l= invalid */
#define DKIM_SIGERROR_INVALID_Q 13 /* q= invalid */
#define DKIM_SIGERROR_INVALID_QO 14 /* q= option invalid */
#define DKIM_SIGERROR_MISSING_D 15 /* d= missing */
#define DKIM_SIGERROR_EMPTY_D 16 /* d= empty */
#define DKIM_SIGERROR_MISSING_S 17 /* s= missing */
#define DKIM_SIGERROR_EMPTY_S 18 /* s= empty */
#define DKIM_SIGERROR_MISSING_B 19 /* b= missing */
#define DKIM_SIGERROR_EMPTY_B 20 /* b= empty */
#define DKIM_SIGERROR_CORRUPT_B 21 /* b= corrupt */
#define DKIM_SIGERROR_NOKEY 22 /* no key found in DNS */
#define DKIM_SIGERROR_DNSSYNTAX 23 /* DNS reply corrupt */
#define DKIM_SIGERROR_KEYFAIL 24 /* DNS query failed */
#define DKIM_SIGERROR_MISSING_BH 25 /* bh= missing */
#define DKIM_SIGERROR_EMPTY_BH 26 /* bh= empty */
#define DKIM_SIGERROR_CORRUPT_BH 27 /* bh= corrupt */
#define DKIM_SIGERROR_BADSIG 28 /* signature mismatch */
#define DKIM_SIGERROR_SUBDOMAIN 29 /* unauthorized subdomain */
#define DKIM_SIGERROR_MULTIREPLY 30 /* multiple records returned */
#define DKIM_SIGERROR_EMPTY_H 31 /* h= empty */
#define DKIM_SIGERROR_INVALID_H 32 /* h= missing req'd entries */
#define DKIM_SIGERROR_TOOLARGE_L 33 /* l= value exceeds body size */
#define DKIM_SIGERROR_MBSFAILED 34 /* "must be signed" failure */
#define DKIM_SIGERROR_KEYVERSION 35 /* unknown key version */
#define DKIM_SIGERROR_KEYUNKNOWNHASH 36 /* unknown key hash */
#define DKIM_SIGERROR_KEYHASHMISMATCH 37 /* sig-key hash mismatch */
#define DKIM_SIGERROR_NOTEMAILKEY 38 /* not an e-mail key */
#define DKIM_SIGERROR_UNUSED2 39 /* OBSOLETE */
#define DKIM_SIGERROR_KEYTYPEMISSING 40 /* key type missing */
#define DKIM_SIGERROR_KEYTYPEUNKNOWN 41 /* key type unknown */
#define DKIM_SIGERROR_KEYREVOKED 42 /* key revoked */
#define DKIM_SIGERROR_KEYDECODE 43 /* key couldn't be decoded */
#define DKIM_SIGERROR_MISSING_V 44 /* v= tag missing */
#define DKIM_SIGERROR_EMPTY_V 45 /* v= tag empty */
/* Check results */
#define DKIM_CONTINUE 0 /* continue */
#define DKIM_REJECT 1 /* reject */
#define DKIM_TRYAGAIN 2 /* try again later */
#define DKIM_NOTFOUND 3 /* requested record not found */
#define DKIM_RECORD_ERROR 4 /* error requesting record */
typedef struct rspamd_dkim_context_s {
rspamd_mempool_t *pool;
gint sig_alg;
gint header_canon_type;
gint body_canon_type;
gsize len;
gchar *domain;
gchar *selector;
time_t timestamp;
time_t expiration;
gint8 *b;
gint8 *bh;
guint bhlen;
guint blen;
GPtrArray *hlist;
guint ver;
gchar *dns_key;
GChecksum *headers_hash;
GChecksum *body_hash;
} rspamd_dkim_context_t;
typedef struct rspamd_dkim_key_s {
guint8 *keydata;
guint keylen;
gsize decoded_len;
guint ttl;
#ifdef HAVE_OPENSSL
RSA *key_rsa;
BIO *key_bio;
EVP_PKEY *key_evp;
#endif
}
rspamd_dkim_key_t;
struct rspamd_task;
/* Err MUST be freed if it is not NULL, key is allocated by slice allocator */
typedef void (*dkim_key_handler_f)(rspamd_dkim_key_t *key, gsize keylen, rspamd_dkim_context_t *ctx, gpointer ud, GError *err);
/**
* Create new dkim context from signature
* @param sig message's signature
* @param pool pool to allocate memory from
* @param time_jitter jitter in seconds to allow time diff while checking
* @param err pointer to error object
* @return new context or NULL
*/
rspamd_dkim_context_t* rspamd_create_dkim_context (const gchar *sig, rspamd_mempool_t *pool, guint time_jitter, GError **err);
/**
* Make DNS request for specified context and obtain and parse key
* @param ctx dkim context from signature
* @param resolver dns resolver object
* @param s async session to make request
* @return
*/
gboolean rspamd_get_dkim_key (rspamd_dkim_context_t *ctx, struct rspamd_dns_resolver *resolver,
struct rspamd_async_session *s, dkim_key_handler_f handler, gpointer ud);
/**
* Check task for dkim context using dkim key
* @param ctx dkim verify context
* @param key dkim key (from cache or from dns request)
* @param task task to check
* @return
*/
gint rspamd_dkim_check (rspamd_dkim_context_t *ctx, rspamd_dkim_key_t *key, struct rspamd_task *task);
/**
* Free DKIM key
* @param key
*/
void rspamd_dkim_key_free (rspamd_dkim_key_t *key);
#endif /* DKIM_H_ */
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