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smf-spf.c
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/* Copyright (C) 2005, 2006 by Eugene Kurmanin <me@kurmanin.info>
* Modifications (C) 2009 Ole Hansen <ole@redvw.com>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* TODO: check strdup() calls for NULL return */
#ifndef _REENTRANT
#error Compile with -D_REENTRANT flag
#endif
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#ifndef __sun__
#include <getopt.h>
#endif
#include <grp.h>
#include <libmilter/mfapi.h>
#include <netinet/in.h>
#include <pthread.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <assert.h>
#include <spf2/spf.h>
/* TODO: use compilation-time defines to set these */
#define CONFIG_FILE "/etc/mail/smfs/smf-spf.conf"
#define WORK_SPACE "/var/run/smfs"
#define OCONN "unix:" WORK_SPACE "/smf-spf.sock"
#define USER "smfs"
#define TAG_STRING "[SPF:fail]"
#define QUARANTINE_BOX "postmaster"
#define SYSLOG_FACILITY LOG_MAIL
#define SPF_TTL 3600
#define DELAY_CHECKS 0
#define REFUSE_FAIL 1
#define REJECT_TEMPERROR 1
#define REJECT_PERMERROR 0
#define TAG_SUBJECT 1
#define RECEIVED_HDRFMT 0xFF
#define ADD_SIGNATURE 1
#define ADD_AUTHRESULT 0
#define WRAP_HEADER 1
#define HEADER_WIDTH 78
#define QUARANTINE 0
#define MAXLINE 128
#define HASH_POWER 16
#define FACILITIES_AMOUNT 10
#define NOJOBID "(unknown jobid)"
#define SMF_SPF_HDRFMT_RESULT 0x01
#define SMF_SPF_HDRFMT_TXT 0x02
#define SMF_SPF_HDRFMT_RECEIVER 0x04
#define SMF_SPF_HDRFMT_CLIENTIP 0x08
#define SMF_SPF_HDRFMT_ENVFROM 0x10
#define SMF_SPF_HDRFMT_HELO 0x20
#define SMF_SPF_AUTHFMT_RESULT 0x01
#define SMF_SPF_AUTHFMT_VERBOSE 0x02
#define SAFE_FREE(x) if (x) { free(x); x = NULL; }
#define hash_size(x) ((unsigned long) 1 << x)
#define hash_mask(x) (hash_size(x) - 1)
#ifdef __sun__
int daemon(int nochdir, int noclose) {
pid_t pid;
int fd = 0;
if ((pid = fork()) < 0) {
fprintf(stderr, "fork: %s\n", strerror(errno));
return 1;
}
else
if (pid > 0) _exit(0);
if ((pid = setsid()) == -1) {
fprintf(stderr, "setsid: %s\n", strerror(errno));
return 1;
}
if ((pid = fork()) < 0) {
fprintf(stderr, "fork: %s\n", strerror(errno));
return 1;
}
else
if (pid > 0) _exit(0);
if (!nochdir && chdir("/")) {
fprintf(stderr, "chdir: %s\n", strerror(errno));
return 1;
}
if (!noclose) {
dup2(fd, fileno(stdout));
dup2(fd, fileno(stderr));
dup2(open("/dev/null", O_RDONLY, 0), fileno(stdin));
}
return 0;
}
#endif
typedef struct cache_data {
SPF_result_t status;
SPF_errcode_t errcode;
} cache_data;
typedef struct cache_item {
char *item;
unsigned long hash;
cache_data data;
time_t exptime;
struct cache_item *next;
} cache_item;
typedef struct CIDR {
unsigned char ip[16];
unsigned short int mask;
sa_family_t addr_family;
struct CIDR *next;
} CIDR;
typedef struct STR {
char *str;
struct STR *next;
} STR;
typedef struct config {
char *tag;
char *quarantine_box;
char *run_as_user;
char *sendmail_socket;
CIDR *cidrs;
STR *ptrs;
STR *froms;
STR *tos;
int delay_checks;
int refuse_fail;
int reject_temperror;
int reject_permerror;
int tag_subject;
int received_header_format;
int add_signature_header;
int add_authresult_header;
int wrap_header;
int header_width;
int quarantine;
int syslog_facility;
unsigned long spf_ttl;
} config;
typedef struct facilities {
char *name;
int facility;
} facilities;
struct context {
char addr[64];
sa_family_t addr_family;
char fqdn[MAXLINE];
char site[MAXLINE];
char helo[MAXLINE];
char from[MAXLINE];
char sender[MAXLINE];
int check_done;
int is_bounce;
int bounce_rcpt_ok;
int nrcpt;
char *subject;
STR *rcpts;
SPF_result_t status;
SPF_errcode_t errcode;
};
/* The thread-safe SPF server, allocated in main() */
static SPF_server_t *spf_server = NULL;
static cache_item **cache = NULL;
static const char *config_file = CONFIG_FILE;
static config conf;
static pthread_mutex_t cache_mutex;
static facilities syslog_facilities[] = {
{ "daemon", LOG_DAEMON },
{ "mail", LOG_MAIL },
{ "local0", LOG_LOCAL0 },
{ "local1", LOG_LOCAL1 },
{ "local2", LOG_LOCAL2 },
{ "local3", LOG_LOCAL3 },
{ "local4", LOG_LOCAL4 },
{ "local5", LOG_LOCAL5 },
{ "local6", LOG_LOCAL6 },
{ "local7", LOG_LOCAL7 }
};
static sfsistat smf_connect(SMFICTX *, char *, _SOCK_ADDR *);
static sfsistat smf_helo(SMFICTX *, char *);
static sfsistat smf_envfrom(SMFICTX *, char **);
static sfsistat smf_envrcpt(SMFICTX *, char **);
static sfsistat smf_data(SMFICTX *);
static sfsistat smf_header(SMFICTX *, char *, char *);
static sfsistat smf_eom(SMFICTX *);
static sfsistat smf_abort(SMFICTX *);
static sfsistat smf_close(SMFICTX *);
static void strscpy(register char *dst, register const char *src, size_t size) {
register size_t i;
for (i = 0; i < size && (dst[i] = src[i]) != 0; i++) continue;
dst[i] = '\0';
}
static void strtolower(register char *str) {
for (; *str; str++)
if (isascii(*str) && isupper(*str)) *str = tolower(*str);
}
static int check_yesno(const char *key, const char *val) {
if (val[0] == 'y' || val[0] == 'Y' || val[0] == 't' || val[0] == 'T' || !strcasecmp(val, "on"))
return 1;
if (val[0] == 'n' || val[0] == 'N' || val[0] == 'f' || val[0] == 'F' || !strncasecmp(val, "off", 2))
return 0;
fprintf(stderr, "Warning: unrecognized configuration value: key=%s, val=%s. Assuming \"off\"\n", key, val);
return 0;
}
static unsigned long translate(char *value) {
unsigned long unit;
size_t len = strlen(value);
switch (value[len - 1]) {
case 'm':
case 'M':
unit = 60;
value[len - 1] = '\0';
break;
case 'h':
case 'H':
unit = 3600;
value[len - 1] = '\0';
break;
case 'd':
case 'D':
unit = 86400;
value[len - 1] = '\0';
break;
default:
return atol(value);
}
return (atol(value) * unit);
}
static unsigned long hash_code(register const char *key) {
register unsigned long hash = 0;
register size_t i, len = strlen(key);
for (i = 0; i < len; i++) {
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
static int cache_init(void) {
if (!(cache = calloc(1, hash_size(HASH_POWER) * sizeof(void *)))) return 0;
return 1;
}
static void cache_destroy(void) {
unsigned long i, size = hash_size(HASH_POWER);
cache_item *it, *it_next;
for (i = 0; i < size; i++) {
it = cache[i];
while (it) {
it_next = it->next;
SAFE_FREE(it->item);
SAFE_FREE(it);
it = it_next;
}
}
SAFE_FREE(cache);
}
static struct cache_data *cache_get(const char *key) {
unsigned long hash = hash_code(key);
cache_item *it = cache[hash & hash_mask(HASH_POWER)];
time_t curtime = time(NULL);
while (it) {
if (it->hash == hash && it->exptime > curtime && it->item && !strcmp(key, it->item)) return &(it->data);
it = it->next;
}
return NULL;
}
static void cache_put(const char *key, unsigned long ttl, SPF_result_t status, SPF_errcode_t errcode) {
unsigned long hash = hash_code(key);
time_t curtime = time(NULL);
cache_item *it, *parent = NULL;
it = cache[hash & hash_mask(HASH_POWER)];
while (it) {
if (it->hash == hash && it->exptime > curtime && it->item && !strcmp(key, it->item)) return;
it = it->next;
}
it = cache[hash & hash_mask(HASH_POWER)];
while (it) {
if (it->exptime < curtime) {
SAFE_FREE(it->item);
it->item = strdup(key);
it->hash = hash;
it->data.status = status;
it->data.errcode = errcode;
it->exptime = curtime + ttl;
return;
}
parent = it;
it = it->next;
}
if ((it = (cache_item *) calloc(1, sizeof(cache_item)))) {
it->item = strdup(key);
it->hash = hash;
it->data.status = status;
it->data.errcode = errcode;
it->exptime = curtime + ttl;
if (parent)
parent->next = it;
else
cache[hash & hash_mask(HASH_POWER)] = it;
}
}
static void free_config(void) {
SAFE_FREE(conf.tag);
SAFE_FREE(conf.quarantine_box);
SAFE_FREE(conf.run_as_user);
SAFE_FREE(conf.sendmail_socket);
if (conf.cidrs) {
CIDR *it = conf.cidrs, *it_next;
while (it) {
it_next = it->next;
free(it);
it = it_next;
}
}
if (conf.ptrs) {
STR *it = conf.ptrs, *it_next;
while (it) {
it_next = it->next;
SAFE_FREE(it->str);
free(it);
it = it_next;
}
}
if (conf.froms) {
STR *it = conf.froms, *it_next;
while (it) {
it_next = it->next;
SAFE_FREE(it->str);
free(it);
it = it_next;
}
}
if (conf.tos) {
STR *it = conf.tos, *it_next;
while (it) {
it_next = it->next;
SAFE_FREE(it->str);
free(it);
it = it_next;
}
}
}
static int load_config(void) {
FILE *fp;
char buf[2 * MAXLINE];
conf.tag = strdup(TAG_STRING);
conf.quarantine_box = strdup(QUARANTINE_BOX);
conf.run_as_user = strdup(USER);
conf.sendmail_socket = strdup(OCONN);
conf.syslog_facility = SYSLOG_FACILITY;
conf.delay_checks = DELAY_CHECKS;
conf.refuse_fail = REFUSE_FAIL;
conf.reject_temperror = REJECT_TEMPERROR;
conf.reject_permerror = REJECT_PERMERROR;
conf.tag_subject = TAG_SUBJECT;
conf.received_header_format = RECEIVED_HDRFMT;
conf.add_signature_header = ADD_SIGNATURE;
conf.add_authresult_header = ADD_AUTHRESULT;
conf.wrap_header = WRAP_HEADER;
conf.header_width = HEADER_WIDTH;
conf.quarantine = QUARANTINE;
conf.spf_ttl = SPF_TTL;
if (!(fp = fopen(config_file, "r"))) return 0;
while (fgets(buf, sizeof(buf) - 1, fp)) {
char key[MAXLINE];
char val[MAXLINE];
char *p = NULL;
if ((p = strchr(buf, '#'))) *p = '\0';
if (!(strlen(buf))) continue;
if (sscanf(buf, "%127s %127s", key, val) != 2) continue;
if (!strncasecmp(key, "whitelistip", 11)) {
char *slash = NULL;
unsigned short int mask;
int ipv6 = 0;
struct in_addr sin_addr;
struct in6_addr sin6_addr;
if (!strcmp(key+11, "6"))
ipv6 = 1;
else if (key[11] != '\0')
continue;
mask = (ipv6 == 1) ? 128 : 32;
if ((slash = strchr(val, '/'))) {
unsigned short int nbits = mask;
*slash = '\0';
if ((mask = atoi(++slash)) > nbits) mask = nbits;
}
if (val[0] &&
((ipv6 == 0 && inet_pton(AF_INET, val, &sin_addr) > 0) ||
(ipv6 == 1 && inet_pton(AF_INET6, val, &sin6_addr) > 0))) {
CIDR *it = (CIDR *) calloc(1, sizeof(CIDR));
if (!conf.cidrs)
conf.cidrs = it;
else if (it) {
it->next = conf.cidrs;
conf.cidrs = it;
}
if (conf.cidrs) {
if( ipv6 == 0 ) {
memcpy(conf.cidrs->ip, &sin_addr.s_addr, 4);
conf.cidrs->addr_family = AF_INET;
} else {
memcpy(conf.cidrs->ip, sin6_addr.s6_addr, 16);
conf.cidrs->addr_family = AF_INET6;
}
conf.cidrs->mask = mask;
}
}
continue;
}
if (!strcasecmp(key, "whitelistptr")) {
STR *it = NULL;
if (!conf.ptrs)
conf.ptrs = (STR *) calloc(1, sizeof(STR));
else
if ((it = (STR *) calloc(1, sizeof(STR)))) {
it->next = conf.ptrs;
conf.ptrs = it;
}
if (conf.ptrs && !conf.ptrs->str) conf.ptrs->str = strdup(val);
continue;
}
if (!strcasecmp(key, "whitelistfrom")) {
STR *it = NULL;
if (!conf.froms)
conf.froms = (STR *) calloc(1, sizeof(STR));
else
if ((it = (STR *) calloc(1, sizeof(STR)))) {
it->next = conf.froms;
conf.froms = it;
}
if (conf.froms && !conf.froms->str) {
strtolower(val);
conf.froms->str = strdup(val);
}
continue;
}
if (!strcasecmp(key, "whitelistto")) {
STR *it = NULL;
if (!conf.tos)
conf.tos = (STR *) calloc(1, sizeof(STR));
else
if ((it = (STR *) calloc(1, sizeof(STR)))) {
it->next = conf.tos;
conf.tos = it;
}
if (conf.tos && !conf.tos->str) {
strtolower(val);
conf.tos->str = strdup(val);
}
continue;
}
if (!strcasecmp(key, "delaychecks")) {
conf.delay_checks = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "refusefail")) {
conf.refuse_fail = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "rejecttemperror")) {
conf.reject_temperror = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "rejectpermerror")) {
conf.reject_permerror = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "tagsubject")) {
conf.tag_subject = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "tag")) {
SAFE_FREE(conf.tag);
conf.tag = strdup(val);
continue;
}
if (!strcasecmp(key, "addheader")) {
char *tok, *str;
conf.received_header_format = 0;
for (str = val; ; str=NULL ) {
tok = strtok(str, ",");
if (tok == NULL) break;
while (*tok && isspace(*tok)) tok++;
if (*tok == '\0') continue;
if (!strncasecmp(tok, "off", 2) ||
!strncasecmp(tok, "false", 1) ||
!strncasecmp(tok, "no", 1)) {
conf.received_header_format = 0;
break;
} else if (!strcasecmp(tok, "on") ||
!strncasecmp(tok, "true", 1) ||
!strncasecmp(tok, "yes", 1)) {
conf.received_header_format = RECEIVED_HDRFMT;
break;
} else if (!strncasecmp(tok, "result", 3)) {
conf.received_header_format |= SMF_SPF_HDRFMT_RESULT;
} else if (!strncasecmp(tok, "description", 1) ||
!strncasecmp(tok, "verbose", 1)) {
conf.received_header_format |= SMF_SPF_HDRFMT_TXT;
} else if (!strncasecmp(tok, "receiver", 3)) {
conf.received_header_format |= SMF_SPF_HDRFMT_RECEIVER;
} else if (!strncasecmp(tok, "clientip", 1) ||
!strncasecmp(tok, "ip", 1)) {
conf.received_header_format |= SMF_SPF_HDRFMT_CLIENTIP;
} else if (!strncasecmp(tok, "envfrom", 1)) {
conf.received_header_format |= SMF_SPF_HDRFMT_ENVFROM;
} else if (!strncasecmp(tok, "helo", 1)) {
conf.received_header_format |= SMF_SPF_HDRFMT_HELO;
} else {
fprintf(stderr, "Warning: unknown configuration token, key=%s, val=%s, tok=%s\n", key, val, tok);
}
}
if (conf.received_header_format)
conf.received_header_format |= SMF_SPF_HDRFMT_RESULT;
continue;
}
if (!strcasecmp(key, "addauthresultheader")) {
conf.add_authresult_header = 0;
if (!strncasecmp(val, "off", 2) ||
!strncasecmp(val, "false", 1) ||
!strncasecmp(val, "no", 1)) {
conf.add_authresult_header = 0;
} else if (!strcasecmp(val, "on") ||
!strncasecmp(val, "true", 1) ||
!strncasecmp(val, "yes", 1)) {
conf.add_authresult_header = SMF_SPF_AUTHFMT_RESULT;
} else if (!strncasecmp(val, "verbose", 1)) {
conf.add_authresult_header = SMF_SPF_AUTHFMT_VERBOSE;
} else {
fprintf(stderr, "Warning: unknown configuration value, key=%s, val=%s\n", key, val);
}
continue;
}
if (!strcasecmp(key, "addsignatureheader")) {
conf.add_signature_header = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "wrapheader")) {
conf.wrap_header = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "headerwidth")) {
conf.header_width = atoi(val);
if (conf.header_width > 998 || conf.header_width < 64) {
conf.header_width = HEADER_WIDTH;
}
continue;
}
if (!strcasecmp(key, "quarantine")) {
conf.quarantine = check_yesno(key, val);
continue;
}
if (!strcasecmp(key, "quarantinebox")) {
SAFE_FREE(conf.quarantine_box);
conf.quarantine_box = strdup(val);
continue;
}
if (!strcasecmp(key, "ttl")) {
conf.spf_ttl = translate(val);
continue;
}
if (!strcasecmp(key, "user")) {
SAFE_FREE(conf.run_as_user);
conf.run_as_user = strdup(val);
continue;
}
if (!strcasecmp(key, "socket")) {
SAFE_FREE(conf.sendmail_socket);
conf.sendmail_socket = strdup(val);
continue;
}
if (!strcasecmp(key, "syslog")) {
int i;
for (i = 0; i < FACILITIES_AMOUNT; i++)
if (!strcasecmp(val, syslog_facilities[i].name))
conf.syslog_facility = syslog_facilities[i].facility;
continue;
}
}
fclose(fp);
return 1;
}
/*
* int
* bitncmp(l, r, n)
* compare bit masks l and r, for n bits.
* return:
* -1, 1, or 0 in the libc tradition.
* note:
* network byte order assumed. this means 192.5.5.240/28 has
* 0x11110000 in its fourth octet.
* author:
* Paul Vixie (ISC), June 1996
*/
static int bitncmp(const void *l, const void *r, int n)
{
unsigned int lb, rb;
int x, b;
b = n / 8;
x = memcmp(l, r, b);
if (x)
return x;
lb = ((const unsigned char *)l)[b];
rb = ((const unsigned char *)r)[b];
for (b = n % 8; b > 0; b--) {
if ((lb & 0x80) != (rb & 0x80)) {
if (lb & 0x80)
return 1;
return -1;
}
lb <<= 1;
rb <<= 1;
}
return 0;
}
static int ip_check(const unsigned char *checkaddr, sa_family_t addr_family) {
CIDR *it = conf.cidrs;
while (it) {
if (it->addr_family == addr_family &&
bitncmp(it->ip, checkaddr, it->mask) == 0) return 1;
it = it->next;
}
return 0;
}
static int ptr_check(const char *ptr) {
STR *it = conf.ptrs;
while (it) {
if (it->str && strlen(it->str) <= strlen(ptr) && !strcasecmp(ptr + strlen(ptr) - strlen(it->str), it->str)) return 1;
it = it->next;
}
return 0;
}
static int from_check(const char *from) {
STR *it = conf.froms;
while (it) {
if (it->str && strstr(from, it->str)) return 1;
it = it->next;
}
return 0;
}
static int to_check(const char *to) {
STR *it = conf.tos;
while (it) {
if (it->str && strstr(to, it->str)) return 1;
it = it->next;
}
return 0;
}
static void die(const char *reason) {
syslog(LOG_ERR, "[ERROR] die: %s", reason);
smfi_stop();
sleep(60);
abort();
}
static void mutex_lock(pthread_mutex_t *mutex) {
if (pthread_mutex_lock(mutex)) die("pthread_mutex_lock");
}
static void mutex_unlock(pthread_mutex_t *mutex) {
if (pthread_mutex_unlock(mutex)) die("pthread_mutex_unlock");
}
static int address_preparation(register char *dst, register const char *src) {
register const char *start = NULL, *stop = NULL;
int tail;
if (!(start = strchr(src, '<'))) return 0;
if (!(stop = strrchr(src, '>'))) return 0;
if (++start >= --stop) return 0;
strscpy(dst, start, stop - start + 1);
tail = strlen(dst) - 1;
if ((dst[0] >= 0x07 && dst[0] <= 0x0d) || dst[0] == 0x20) return 0;
if ((dst[tail] >= 0x07 && dst[tail] <= 0x0d) || dst[tail] == 0x20) return 0;
if (!strchr(dst, '@')) return 0;
return 1;
}
static void add_rcpt(struct context *context, const char* rcpt) {
STR *it = NULL;
if (!context->rcpts)
context->rcpts = (STR *) calloc(1, sizeof(STR));
else
if ((it = (STR *) calloc(1, sizeof(STR)))) {
it->next = context->rcpts;
context->rcpts = it;
}
if (context->rcpts && !context->rcpts->str) context->rcpts->str = strdup(rcpt);
}
static void wrap_header(char* header, size_t len, size_t indent, size_t width) {
const size_t tab = 8;
size_t nchars, pos, buflen;
char *buf, *p, *q, *start;
int spc, newchars, startline;
if (!header || indent>=width || width<2*tab)
return;
nchars = strlen(header);
if ((nchars+indent) < width )
return;
buflen = nchars+1+2*(nchars/(width-tab)+1);
if (buflen>len)
return;
buf = (char*)malloc(buflen);
if (!buf)
return;
start = p = header;
q = buf;
pos = indent+1;
newchars = spc = 0;
startline = 1;
while (*p) {
if (*p == ' ') {
if (newchars) {
strncpy(q, start, p-start);
q += p-start;
newchars = 0;
if (spc) {
pos++;
}
}
if (!startline) {
start = p;
spc = 1;
}
} else {
if (startline) {
start = p;
startline = 0;
}
newchars = 1;
pos++;
}
p++;
if (pos>width) {
pos = tab+1;
if (spc) {
strcpy(q, "\n\t");
q += 2;
start++;
startline = 1;
}
if (newchars) {
strncpy(q, start, p-start);
q += p-start;
startline = 0;
newchars = 0;
if (spc) {
pos += p-start;
}
}
if (!spc) {
strcpy(q, "\n\t ");
q += 3;
startline = 2;
pos++;
}
start = p;
spc = 0;
}
}
if (newchars) {
strncpy(q, start, p-start);
q += p-start;
} else if (startline && q != buf) {
q -= 2;
if (startline == 2) q--;
}
*q = '\0';
strcpy(header, buf);
free(buf);
}
static int safe_ret(size_t size, int nchars) {
if( nchars >= (int)size || nchars < 0 ) {
nchars = 0;
}
return nchars;
}
static SPF_result_t fixup_libspf2_result(SPF_result_t status, SPF_errcode_t errcode)
{
/* Buggy libspf2 often does not assign a result code in case of an error */
if (status == SPF_RESULT_INVALID) {
switch (errcode) {
case SPF_E_NOT_SPF:
status = SPF_RESULT_NONE;
break;
case SPF_E_NO_MEMORY:
case SPF_E_DNS_ERROR: /* This combination may also be be a PERMERROR :-/ */
status = SPF_RESULT_TEMPERROR;
break;
/* These two deserve an "invalid" result code */
case SPF_E_INTERNAL_ERROR:
case SPF_E_UNINIT_VAR:
break;
default:
status = SPF_RESULT_PERMERROR;
break;
}
}
return status;
}
static int write_spf_txt(char *spf_txt, size_t LEN, const struct context *context) {
int nchars = 0;
switch (context->status) {
case SPF_RESULT_PASS:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: domain of %s designates %s as permitted sender)",
context->site, context->sender, context->addr));
break;
case SPF_RESULT_FAIL:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: domain of %s does not designate %s as permitted sender)",
context->site, context->sender, context->addr));
break;
case SPF_RESULT_SOFTFAIL:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: transitioning domain of %s does not designate %s as "
"permitted sender)", context->site, context->sender, context->addr));
break;
case SPF_RESULT_NEUTRAL:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: sender %s is neither permitted nor denied by domain of %s)",
context->site, context->addr, context->sender));
break;
case SPF_RESULT_NONE:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: domain of %s does not designate permitted sender hosts)",
context->site, context->sender));
break;
case SPF_RESULT_TEMPERROR:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: error in processing during lookup of %s: %s)",
context->site, context->sender, SPF_strerror(context->errcode)));
break;
case SPF_RESULT_PERMERROR:
nchars = safe_ret(LEN, snprintf(spf_txt, LEN, " (%s: unrecoverable error during lookup of %s: %s)",
context->site, context->sender, SPF_strerror(context->errcode)));
break;
default:
break;
}
return nchars;
}
static void insert_headers(SMFICTX *ctx, const struct context *context) {
const size_t LEN = 974;
size_t pos = 0;
const char *spf_result = SPF_strresult(context->status);
char *spf_hdr = (char *)malloc(LEN);
if (!spf_hdr) {
return;
}
if (conf.received_header_format) {
*spf_hdr = 0;
pos = safe_ret(LEN, snprintf(spf_hdr, LEN, "%s", spf_result));
if (conf.received_header_format & SMF_SPF_HDRFMT_TXT) {
pos += write_spf_txt(spf_hdr+pos, LEN-pos, context);
}
if (conf.received_header_format & SMF_SPF_HDRFMT_RECEIVER) {
pos += safe_ret(LEN, snprintf(spf_hdr+pos, LEN-pos, " receiver=%s;", context->site));
}
if (conf.received_header_format & SMF_SPF_HDRFMT_CLIENTIP) {
pos += safe_ret(LEN, snprintf(spf_hdr+pos, LEN-pos, " client-ip=%s;", context->addr));
}
if (conf.received_header_format & SMF_SPF_HDRFMT_ENVFROM) {
/* As per erratum of the SPF RFC, the envelope-from is to be a quoted string */
size_t len = strlen(context->from);
char *quoted_from = (char*)malloc(len+3);
if (quoted_from) {
const char *p = context->from;
if (len>0 && p[len-1] == '>') {
len--;
}
if (*p == '<') {
p++;
len--;
}
*quoted_from = '"';
strncpy(quoted_from+1, p, len);
strcpy(quoted_from+len+1, "\"");
pos += safe_ret(LEN, snprintf(spf_hdr+pos, LEN-pos, " envelope-from=%s;", quoted_from));
free(quoted_from);
}
}
if (conf.received_header_format & SMF_SPF_HDRFMT_HELO) {
pos += safe_ret(LEN, snprintf(spf_hdr+pos, LEN-pos, " helo=%s;", context->helo));
}
if (conf.wrap_header) {
wrap_header(spf_hdr, LEN, 14, conf.header_width);
}
smfi_insheader(ctx, 1, "Received-SPF", spf_hdr);
}
if (conf.add_authresult_header) {
const char *spf_authresult = spf_result;
/* Conform to RFC 5451 */
if (!strcmp(spf_authresult, "fail")) {
spf_authresult = "hardfail";
}
*spf_hdr = 0;
pos = safe_ret(LEN, snprintf(spf_hdr, LEN, "%s; spf=%s", context->site, spf_authresult));
if (conf.add_authresult_header & SMF_SPF_AUTHFMT_VERBOSE) {
pos += write_spf_txt(spf_hdr+pos, LEN-pos, context);
}
snprintf(spf_hdr+pos, LEN-pos, " smtp.mailfrom=%s", context->sender);