signing-milter.h

/*
 * signing-milter - signing-milter.h
 * Copyright (C) 2010-2021  Andreas Schulze
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; only version 2 of the License is applicable.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authors:
 *   Andreas Schulze <signing-milter at andreasschulze.de>
 *
 */

#ifndef _SIGNING_MILTER_H_INCLUDED_
#define _SIGNING_MILTER_H_INCLUDED_

#include <cdb.h>
#include <openssl/x509.h>
#include "config.h"

#define STR_PROGNAME    "signing-milter"
#ifdef NDEBUG
#define STR_PROGVERSION "20210822"
#else
#define STR_PROGVERSION "20210822-debug"
#endif

/*
 * Name of the header added by -x cmdline switch
 */
#define HEADERNAME_XHEADER "X-Signed-by"

/*
 * Name of the header used as signeraddress
 * if opt_signerfromheader is enabled
 */
#define HEADERNAME_SIGNER "X-Signer"

/*
 * Name of the header used to signal the
 * desire to not sign a particular message
 */
#define HEADERNAME_SKIP_SIGNING "X-Skip-Signing"

/* buffer for caching one header */
#define MAXHEADERLEN 4096

/* ======= CDB ======================= */
/* übliche Länge des Speichers der für dict.buffer allokiert wird */
#define DICT_BUFFER_LEN 512

typedef struct DICT {
    char*          name;
    int            flags;
    int            stat_fd;
    time_t         mtime;
    struct cdb     cdb;
    char*          buffer;
    char*          result;
    unsigned       result_len;
} DICT;

#define DICT_FLAG_TRY0NULL      (1<<2)  /* do not append 0 to key/value */
#define DICT_FLAG_TRY1NULL      (1<<3)  /* append 0 to key/value */

/* ======= NODES ======================= */
/*
 * - Zeiger auf den naechsten Knoten
 * - Type des Knoten
 */
struct node_t {
    struct node_t* next;
    char*          headerf;
    char*          headerv;
};
#define NODE struct node_t

/* ======= CALLBACK ================== */
struct ctxdata {
    char*           pemfilename;
    NODE*           headerchain;
    unsigned char*  data2sign;
    size_t          data2sign_len;
    X509*           cert;
    EVP_PKEY*       key;
    STACK_OF(X509)* chain;
    BIO*            inbio;
    BIO*            outbio;
    PKCS7*          pkcs7;
    int             pkcs7flags;
    int             mailflags;
    char*           buffer;
    size_t          buffer_len;
    char*           queueid;
    int             first_bodychunk_seen;
    char*           keepdir;
};
#define CTXDATA struct ctxdata

/* Werte fuer ctxdata.mailflags */
#define MF_TYPE_MIME                   (1<<0)
#define MF_TYPE_MULTIPART              (1<<1)
#define MF_SIGNMODE_OPAQUE             (1<<2)
#define MF_SIGNER_FROM_HEADER          (1<<3)
#define MF_SKIP_SIGNING                (1<<4)

/*
 * globale Variablen
 * koennen durch Kommandozeienparameter
 * veraendert werden
 */
extern char* opt_clientgroup;
extern int   opt_loglevel;
extern int   opt_logdest;
extern char* opt_group;
extern char* opt_keepdir;
extern char* opt_signingtable;
extern char* opt_modetable;
extern char* opt_miltersocket;
extern int   opt_timeout;
extern char* opt_user;
extern int   opt_addxheader;
extern int   opt_signerfromheader;

extern struct DICT dict_signingtable;

extern struct DICT dict_modetable;

/*
 * where logging goes
 */
#define LOG_DEST_SYSLOG 1
#define LOG_DEST_STDOUT 2

#endif