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ssmtp.c
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ssmtp.c
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/*
sSMTP -- send messages via SMTP to a mailhub for local delivery or forwarding.
This program is used in place of /usr/sbin/sendmail, called by "mail" (et all).
sSMTP does a selected subset of sendmail's standard tasks (including exactly
one rewriting task), and explains if you ask it to do something it can't. It
then sends the mail to the mailhub via an SMTP connection. Believe it or not,
this is nothing but a filter
See COPYRIGHT for the license
*/
#define VERSION "2.64"
#define _GNU_SOURCE
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/param.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <syslog.h>
#include <signal.h>
#include <setjmp.h>
#include <string.h>
#include <ctype.h>
#include <netdb.h>
#ifdef HAVE_SSL
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#ifdef MD5AUTH
#include "md5auth/hmac_md5.h"
#endif
#include "ssmtp.h"
#include <fcntl.h>
#include "xgethostname.h"
bool_t have_date = False;
bool_t have_from = False;
#ifdef HASTO_OPTION
bool_t have_to = False;
#endif
bool_t minus_t = False;
bool_t minus_v = False;
bool_t override_from = False;
bool_t rewrite_domain = False;
bool_t use_tls = False; /* Use SSL to transfer mail to HUB */
bool_t use_starttls = False; /* SSL only after STARTTLS (RFC2487) */
bool_t use_cert = False; /* Use a certificate to transfer SSL mail */
bool_t use_oldauth = False; /* use old AUTH LOGIN username style */
#define ARPADATE_LENGTH 32 /* Current date in RFC format */
char arpadate[ARPADATE_LENGTH];
char *auth_user = (char)NULL;
char *auth_pass = (char)NULL;
char *auth_method = (char)NULL; /* Mechanism for SMTP authentication */
char *mail_domain = (char)NULL;
char *from = (char)NULL; /* Use this as the From: address */
char *hostname;
char *mailhost = "mailhub";
char *minus_f = (char)NULL;
char *minus_F = (char)NULL;
char *gecos;
char *prog = (char)NULL;
char *root = NULL;
char *tls_cert = "/etc/ssl/certs/ssmtp.pem"; /* Default Certificate */
char *uad = (char)NULL;
char *config_file = (char)NULL; /* alternate configuration file */
headers_t headers, *ht;
#ifdef DEBUG
int log_level = 1;
#else
int log_level = 0;
#endif
int port = 25;
#ifdef INET6
int p_family = PF_UNSPEC; /* Protocol family used in SMTP connection */
#endif
jmp_buf TimeoutJmpBuf; /* Timeout waiting for input from network */
rcpt_t rcpt_list, *rt;
#ifdef HAVE_SSL
SSL *ssl;
#endif
#ifdef MD5AUTH
static char hextab[]="0123456789abcdef";
#endif
ssize_t outbytes;
/*
log_event() -- Write event to syslog (or log file if defined)
*/
void log_event(int priority, char *format, ...)
{
char buf[(BUF_SZ + 1)];
va_list ap;
va_start(ap, format);
(void)vsnprintf(buf, BUF_SZ, format, ap);
va_end(ap);
#ifdef LOGFILE
FILE *fp;
if((fp = fopen("/tmp/ssmtp.log", "a")) != (FILE *)NULL) {
(void)fprintf(fp, "%s\n", buf);
(void)fclose(fp);
}
else {
(void)fprintf(stderr, "Can't write to /tmp/ssmtp.log\n");
}
#endif
#if HAVE_SYSLOG_H
#if OLDSYSLOG
openlog("sSMTP", LOG_PID);
#else
openlog("sSMTP", LOG_PID, LOG_MAIL);
#endif
syslog(priority, "%s", buf);
closelog();
#endif
}
ssize_t smtp_write(int fd, char *format, ...);
int smtp_read(int fd, char *response);
int smtp_read_all(int fd, char *response);
int smtp_okay(int fd, char *response);
/*
dead_letter() -- Save stdin to ~/dead.letter if possible
*/
void dead_letter(void)
{
char *path;
char buf[(BUF_SZ + 1)];
struct passwd *pw;
uid_t uid;
FILE *fp;
uid = getuid();
pw = getpwuid(uid);
if(isatty(fileno(stdin))) {
if(log_level > 0) {
log_event(LOG_ERR,
"stdin is a TTY - not saving to %s/dead.letter", pw->pw_dir);
}
return;
}
if(pw == (struct passwd *)NULL) {
/* Far to early to save things */
if(log_level > 0) {
log_event(LOG_ERR, "No sender failing horribly!");
}
return;
}
#define DEAD_LETTER "/dead.letter"
path = malloc (strlen (pw->pw_dir) + sizeof (DEAD_LETTER));
if (!path) {
/* Can't use die() here since dead_letter() is called from die() */
exit(1);
}
memcpy (path, pw->pw_dir, strlen (pw->pw_dir));
memcpy (path + strlen (pw->pw_dir), DEAD_LETTER, sizeof (DEAD_LETTER));
if((fp = fopen(path, "a")) == (FILE *)NULL) {
/* Perhaps the person doesn't have a homedir... */
if(log_level > 0) {
log_event(LOG_ERR, "Can't open %s failing horribly!", path);
}
free(path);
return;
}
/* We start on a new line with a blank line separating messages */
(void)fprintf(fp, "\n\n");
while(fgets(buf, sizeof(buf), stdin)) {
(void)fputs(buf, fp);
}
if(fclose(fp) == -1) {
if(log_level > 0) {
log_event(LOG_ERR,
"Can't close %s/dead.letter, possibly truncated", pw->pw_dir);
}
}
free(path);
}
/*
die() -- Write error message, dead.letter and exit
*/
void die(char *format, ...)
{
char buf[(BUF_SZ + 1)];
va_list ap;
va_start(ap, format);
(void)vsnprintf(buf, BUF_SZ, format, ap);
va_end(ap);
(void)fprintf(stderr, "%s: %s\n", prog, buf);
log_event(LOG_ERR, "%s", buf);
/* Send message to dead.letter */
(void)dead_letter();
exit(1);
}
#ifndef _GNU_SOURCE
/*
basename() -- Return last element of path
*/
char *basename(char *str)
{
char *p;
p = strrchr(str, '/');
if (!p) {
p = str;
}
return(strdup(p));
}
#endif /* _GNU_SOURCE */
/*
strip_pre_ws() -- Return pointer to first non-whitespace character
*/
char *strip_pre_ws(char *str)
{
char *p;
p = str;
while(*p && isspace(*p)) p++;
return(p);
}
/*
strip_post_ws() -- Return pointer to last non-whitespace character
*/
char *strip_post_ws(char *str)
{
char *p;
p = (str + strlen(str));
while(isspace(*--p)) {
*p = (char)NULL;
}
return(p);
}
/*
addr_parse() -- Parse <[email protected]> from full email address
*/
char *addr_parse(char *str)
{
char *p, *q;
#if 0
(void)fprintf(stderr, "*** addr_parse(): str = [%s]\n", str);
#endif
/* Simple case with email address enclosed in <> */
if((p = strdup(str)) == (char *)NULL) {
die("addr_parse(): strdup()");
}
if((q = strchr(p, '<'))) {
q++;
if((p = strchr(q, '>'))) {
*p = (char)NULL;
}
#if 0
(void)fprintf(stderr, "*** addr_parse(): q = [%s]\n", q);
#endif
return(q);
}
q = strip_pre_ws(p);
if(*q == '(') {
while((*q++ != ')'));
}
p = strip_pre_ws(q);
#if 0
(void)fprintf(stderr, "*** addr_parse(): p = [%s]\n", p);
#endif
q = strip_post_ws(p);
if(*q == ')') {
while((*--q != '('));
*q = (char)NULL;
}
(void)strip_post_ws(p);
#if 0
(void)fprintf(stderr, "*** addr_parse(): p = [%s]\n", p);
#endif
return(p);
}
/*
append_domain() -- Fix up address with @domain.com
*/
char *append_domain(char *str)
{
char buf[(BUF_SZ + 1)];
if(strchr(str, '@') == (char *)NULL) {
if(snprintf(buf, BUF_SZ, "%s@%s", str,
#ifdef REWRITE_DOMAIN
rewrite_domain == True ? mail_domain : hostname
#else
hostname
#endif
) == -1) {
die("append_domain() -- snprintf() failed");
}
return(strdup(buf));
}
return(strdup(str));
}
/*
standardise() -- Trim off '\n's and double leading dots
*/
bool_t standardise(char *str, bool_t *linestart)
{
size_t sl;
char *p;
bool_t leadingdot = False;
/* Any line beginning with a dot has an additional dot inserted;
not just a line consisting solely of a dot. Thus we have to move
the buffer start up one */
if(*linestart && *str == '.') {
leadingdot = True;
}
*linestart = False;
if((p = strchr(str, '\n'))) {
*p = (char)NULL;
*linestart = True;
}
return(leadingdot);
}
/*
revaliases() -- Parse the reverse alias file
Fix globals to use any entry for sender
*/
void revaliases(struct passwd *pw)
{
char buf[(BUF_SZ + 1)], *p;
FILE *fp;
/* Try to open the reverse aliases file */
if((fp = fopen(REVALIASES_FILE, "r"))) {
/* Search if a reverse alias is defined for the sender */
while(fgets(buf, sizeof(buf), fp)) {
/* Make comments invisible */
if((p = strchr(buf, '#'))) {
*p = (char)NULL;
}
/* Ignore malformed lines and comments */
if(strchr(buf, ':') == (char *)NULL) {
continue;
}
/* Parse the alias */
if(((p = strtok(buf, ":"))) && !strcmp(p, pw->pw_name)) {
if((p = strtok(NULL, ": \t\r\n"))) {
if((uad = strdup(p)) == (char *)NULL) {
die("revaliases() -- strdup() failed");
}
}
if((p = strtok(NULL, " \t\r\n:"))) {
if((mailhost = strdup(p)) == (char *)NULL) {
die("revaliases() -- strdup() failed");
}
if((p = strtok(NULL, " \t\r\n:"))) {
port = atoi(p);
}
if(log_level > 0) {
log_event(LOG_INFO, "Set MailHub=\"%s\"\n", mailhost);
log_event(LOG_INFO,
"via SMTP Port Number=\"%d\"\n", port);
}
}
}
}
fclose(fp);
}
}
/*
from_strip() -- Transforms "Name <login@host>" into "login@host" or "login@host (Real name)"
*/
char *from_strip(char *str)
{
char *p;
#if 0
(void)fprintf(stderr, "*** from_strip(): str = [%s]\n", str);
#endif
if(strncmp("From:", str, 5) == 0) {
str += 5;
}
/* Remove the real name if necessary - just send the address */
if((p = addr_parse(str)) == (char *)NULL) {
die("from_strip() -- addr_parse() failed");
}
#if 0
(void)fprintf(stderr, "*** from_strip(): p = [%s]\n", p);
#endif
return(strdup(p));
}
/*
from_format() -- Generate standard From: line
*/
char *from_format(char *str, bool_t override_from)
{
char buf[(BUF_SZ + 1)];
if(override_from) {
if(minus_f) {
str = append_domain(minus_f);
}
if(minus_F) {
if(snprintf(buf,
BUF_SZ, "\"%s\" <%s>", minus_F, str) == -1) {
die("from_format() -- snprintf() failed");
}
}
else if(gecos) {
if(snprintf(buf, BUF_SZ, "\"%s\" <%s>", gecos, str) == -1) {
die("from_format() -- snprintf() failed");
}
}
else {
if(snprintf(buf, BUF_SZ, "%s", str) == -1) {
die("from_format() -- snprintf() failed");
}
}
}
else {
if(gecos) {
if(snprintf(buf, BUF_SZ, "\"%s\" <%s>", gecos, str) == -1) {
die("from_format() -- snprintf() failed");
}
}
else {
if(snprintf(buf, BUF_SZ, "%s", str) == -1) {
die("from_format() -- snprintf() failed");
}
}
}
#if 0
(void)fprintf(stderr, "*** from_format(): buf = [%s]\n", buf);
#endif
return(strdup(buf));
}
/*
rcpt_save() -- Store entry into RCPT list
*/
void rcpt_save(char *str)
{
char *p;
# if 1
/* Horrible botch for group stuff */
p = str;
while(*p) p++;
if(*--p == ';') {
return;
}
#endif
#if 0
(void)fprintf(stderr, "*** rcpt_save(): str = [%s]\n", str);
#endif
/* Ignore missing usernames */
if(*str == (char)NULL) {
return;
}
if((rt->string = strdup(str)) == (char *)NULL) {
die("rcpt_save() -- strdup() failed");
}
rt->next = (rcpt_t *)malloc(sizeof(rcpt_t));
if(rt->next == (rcpt_t *)NULL) {
die("rcpt_save() -- malloc() failed");
}
rt = rt->next;
rt->next = (rcpt_t *)NULL;
}
/*
rcpt_parse() -- Break To|Cc|Bcc into individual addresses
*/
void rcpt_parse(char *str)
{
bool_t in_quotes = False, got_addr = False;
char *p, *q, *r;
#if 0
(void)fprintf(stderr, "*** rcpt_parse(): str = [%s]\n", str);
#endif
if((p = strdup(str)) == (char *)NULL) {
die("rcpt_parse(): strdup() failed");
}
q = p;
/* Replace <CR>, <LF> and <TAB> */
while(*q) {
switch(*q) {
case '\t':
case '\n':
case '\r':
*q = ' ';
}
q++;
}
q = p;
#if 0
(void)fprintf(stderr, "*** rcpt_parse(): q = [%s]\n", q);
#endif
r = q;
while(*q) {
if(*q == '"') {
in_quotes = (in_quotes ? False : True);
}
/* End of string? */
if(*(q + 1) == (char)NULL) {
got_addr = True;
}
/* End of address? */
if((*q == ',') && (in_quotes == False)) {
got_addr = True;
*q = (char)NULL;
}
if(got_addr) {
while(*r && isspace(*r)) r++;
rcpt_save(addr_parse(r));
r = (q + 1);
#if 0
(void)fprintf(stderr, "*** rcpt_parse(): r = [%s]\n", r);
#endif
got_addr = False;
}
q++;
}
free(p);
}
#ifdef MD5AUTH
int crammd5(char *challengeb64, char *username, char *password, char *responseb64)
{
int i;
unsigned char digest[MD5_DIGEST_LEN];
unsigned char digascii[MD5_DIGEST_LEN * 2];
unsigned char challenge[(BUF_SZ + 1)];
unsigned char response[(BUF_SZ + 1)];
unsigned char secret[(MD5_BLOCK_LEN + 1)];
memset (secret,0,sizeof(secret));
memset (challenge,0,sizeof(challenge));
strncpy (secret, password, sizeof(secret));
if (!challengeb64 || strlen(challengeb64) > sizeof(challenge) * 3 / 4)
return 0;
from64tobits(challenge, challengeb64);
hmac_md5(challenge, strlen(challenge), secret, strlen(secret), digest);
for (i = 0; i < MD5_DIGEST_LEN; i++) {
digascii[2 * i] = hextab[digest[i] >> 4];
digascii[2 * i + 1] = hextab[(digest[i] & 0x0F)];
}
digascii[MD5_DIGEST_LEN * 2] = '\0';
if (sizeof(response) <= strlen(username) + sizeof(digascii))
return 0;
strncpy (response, username, sizeof(response) - sizeof(digascii) - 2);
strcat (response, " ");
strcat (response, digascii);
to64frombits(responseb64, response, strlen(response));
return 1;
}
#endif
/*
rcpt_remap() -- Alias systems-level users to the person who
reads their mail. This is variously the owner of a workstation,
the sysadmin of a group of stations and the postmaster otherwise.
We don't just mail stuff off to root on the mailhub :-)
*/
char *rcpt_remap(char *str)
{
struct passwd *pw;
if((root==NULL) || strlen(root)==0 || strchr(str, '@') ||
((pw = getpwnam(str)) == NULL) || (pw->pw_uid > MAXSYSUID)) {
return(append_domain(str)); /* It's not a local systems-level user */
}
else {
return(append_domain(root));
}
}
/*
header_save() -- Store entry into header list
*/
void header_save(char *str)
{
char *p;
#if 0
(void)fprintf(stderr, "header_save(): str = [%s]\n", str);
#endif
if((p = strdup(str)) == (char *)NULL) {
die("header_save() -- strdup() failed");
}
ht->string = p;
if(strncasecmp(ht->string, "From:", 5) == 0) {
#if 1
/* Hack check for NULL From: line */
if(*(p + 6) == (char)NULL) {
return;
}
#endif
#ifdef REWRITE_DOMAIN
if(override_from == True) {
uad = from_strip(ht->string);
}
else {
return;
}
#endif
have_from = True;
}
#ifdef HASTO_OPTION
else if(strncasecmp(ht->string, "To:" ,3) == 0) {
have_to = True;
}
#endif
else if(strncasecmp(ht->string, "Date:", 5) == 0) {
have_date = True;
}
if(minus_t) {
/* Need to figure out recipients from the e-mail */
if(strncasecmp(ht->string, "To:", 3) == 0) {
p = (ht->string + 3);
rcpt_parse(p);
}
else if(strncasecmp(ht->string, "Bcc:", 4) == 0) {
p = (ht->string + 4);
rcpt_parse(p);
/* Undo adding the header to the list: */
free(ht->string);
ht->string = NULL;
return;
}
else if(strncasecmp(ht->string, "CC:", 3) == 0) {
p = (ht->string + 3);
rcpt_parse(p);
}
}
#if 0
(void)fprintf(stderr, "header_save(): ht->string = [%s]\n", ht->string);
#endif
ht->next = (headers_t *)malloc(sizeof(headers_t));
if(ht->next == (headers_t *)NULL) {
die("header_save() -- malloc() failed");
}
ht = ht->next;
ht->next = (headers_t *)NULL;
}
/*
header_parse() -- Break headers into seperate entries
*/
void header_parse(FILE *stream)
{
size_t size = BUF_SZ, len = 0;
char *p = (char *)NULL, *q;
bool_t in_header = True;
char l = (char)NULL;
int c;
while(in_header && ((c = fgetc(stream)) != EOF)) {
/* Must have space for up to two more characters, since we
may need to insert a '\r' */
if((p == (char *)NULL) || (len >= (size - 1))) {
size += BUF_SZ;
p = (char *)realloc(p, (size * sizeof(char)));
if(p == (char *)NULL) {
die("header_parse() -- realloc() failed");
}
q = (p + len);
}
len++;
if(l == '\n') {
switch(c) {
case ' ':
case '\t':
/* Must insert '\r' before '\n's embedded in header
fields otherwise qmail won't accept our mail
because a bare '\n' violates some RFC */
*(q - 1) = '\r'; /* Replace previous \n with \r */
*q++ = '\n'; /* Insert \n */
len++;
break;
case '\n':
in_header = False;
default:
*q = (char)NULL;
if((q = strrchr(p, '\n'))) {
*q = (char)NULL;
}
header_save(p);
q = p;
len = 0;
}
}
*q++ = c;
l = c;
}
if(in_header) {
if(l == '\n') {
switch(c) {
case ' ':
case '\t':
/* Must insert '\r' before '\n's embedded in header
fields otherwise qmail won't accept our mail
because a bare '\n' violates some RFC */
*(q - 1) = '\r'; /* Replace previous \n with \r */
*q++ = '\n'; /* Insert \n */
len++;
break;
case '\n':
in_header = False;
default:
*q = (char)NULL;
if((q = strrchr(p, '\n'))) {
*q = (char)NULL;
}
header_save(p);
q = p;
len = 0;
}
}
}
(void)free(p);
}
/*
* This is much like strtok, but does not modify the string
* argument.
* Args:
* char **s:
* Address of the pointer to the string we are looking at.
* const char *delim:
* The set of delimiters.
* Return value:
* The first token, copied by strndup (caller have to free it),
* if a token is found, or NULL if isn't (os strndup fails)
* *s points to the rest of the string
*/
char *firsttok(char **s, const char *delim)
{
char *tok;
char *rest;
rest=strpbrk(*s,delim);
if (!rest) {
return NULL;
}
tok=strndup(*s,rest-(*s));
if (!tok) {
die("firsttok() -- strndup() failed");
}
*s=rest+1;
return tok;
}
/*
read_config() -- Open and parse config file and extract values of variables
*/
bool_t read_config()
{
char buf[(BUF_SZ + 1)], *p, *q, *r;
FILE *fp;
if(config_file == (char *)NULL) {
config_file = strdup(CONFIGURATION_FILE);
if(config_file == (char *)NULL) {
die("parse_config() -- strdup() failed");
}
}
if((fp = fopen(config_file, "r")) == NULL) {
return(False);
}
while(fgets(buf, sizeof(buf), fp)) {
char *begin=buf;
char *rightside;
/* Make comments invisible */
if((p = strchr(buf, '#'))) {
*p = (char)NULL;
}
/* Ignore malformed lines and comments */
if(strchr(buf, '=') == (char *)NULL) continue;
/* Parse out keywords */
p=firsttok(&begin, "= \t\n");
if(p){
rightside=begin;
q = firsttok(&begin, "= \t\n");
}
if(p && q) {
if(strcasecmp(p, "Root") == 0) {
if((root = strdup(q)) == (char *)NULL) {
die("parse_config() -- strdup() failed");
}
if(log_level > 0) {
log_event(LOG_INFO, "Set Root=\"%s\"\n", root);
}
}
else if(strcasecmp(p, "MailHub") == 0) {
if((r = strchr(q, ':')) != NULL) {
*r++ = '\0';
port = atoi(r);
}
if((mailhost = strdup(q)) == (char *)NULL) {
die("parse_config() -- strdup() failed");
}
if(log_level > 0) {
log_event(LOG_INFO, "Set MailHub=\"%s\"\n", mailhost);
log_event(LOG_INFO, "Set RemotePort=\"%d\"\n", port);
}
}
else if(strcasecmp(p, "HostName") == 0) {
free(hostname);
hostname = strdup(q);
if (!hostname) {
die("parse_config() -- strdup() failed");
}
if(log_level > 0) {
log_event(LOG_INFO, "Set HostName=\"%s\"\n", hostname);
}
}
else if(strcasecmp(p,"AddHeader") == 0) {
if((r = firsttok(&rightside, "\n#")) != NULL) {
header_save(r);
free(r);
} else {
die("cannot AddHeader");
}
if(log_level > 0 ) {
log_event(LOG_INFO, "Set AddHeader=\"%s\"\n", q);
}
}
#ifdef REWRITE_DOMAIN
else if(strcasecmp(p, "RewriteDomain") == 0) {
if((p = strrchr(q, '@'))) {
mail_domain = strdup(++p);
log_event(LOG_ERR,
"Set RewriteDomain=\"%s\" is invalid\n", q);
log_event(LOG_ERR,
"Set RewriteDomain=\"%s\" used\n", mail_domain);
}
else {
mail_domain = strdup(q);
}
if(mail_domain == (char *)NULL) {
die("parse_config() -- strdup() failed");
}
rewrite_domain = True;
if(log_level > 0) {
log_event(LOG_INFO,
"Set RewriteDomain=\"%s\"\n", mail_domain);
}
}
#endif
else if(strcasecmp(p, "FromLineOverride") == 0) {
if(strcasecmp(q, "YES") == 0) {
override_from = True;
}
else {
override_from = False;
}
if(log_level > 0) {
log_event(LOG_INFO,
"Set FromLineOverride=\"%s\"\n",
override_from ? "True" : "False");
}
}
else if(strcasecmp(p, "RemotePort") == 0) {
port = atoi(q);
if(log_level > 0) {
log_event(LOG_INFO, "Set RemotePort=\"%d\"\n", port);
}
}
#ifdef HAVE_SSL
else if(strcasecmp(p, "UseTLS") == 0) {
if(strcasecmp(q, "YES") == 0) {
use_tls = True;
}
else {
use_tls = False;
use_starttls = False;
}
if(log_level > 0) {
log_event(LOG_INFO,
"Set UseTLS=\"%s\"\n", use_tls ? "True" : "False");
}
}
else if(strcasecmp(p, "UseSTARTTLS") == 0) {
if(strcasecmp(q, "YES") == 0) {