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| Current File : //compat/linux/proc/self/root/usr/src/contrib/sendmail/src/usersmtp.c |
/*
* Copyright (c) 1998-2006, 2008-2010 Sendmail, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
* Copyright (c) 1988, 1993
* The Regents of the University of California. 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.
*
*/
#include <sendmail.h>
SM_RCSID("@(#)$Id: usersmtp.c,v 8.485 2010/07/23 21:09:38 ca Exp $")
#include <sysexits.h>
static void esmtp_check __P((char *, bool, MAILER *, MCI *, ENVELOPE *));
static void helo_options __P((char *, bool, MAILER *, MCI *, ENVELOPE *));
static int smtprcptstat __P((ADDRESS *, MAILER *, MCI *, ENVELOPE *));
#if SASL
extern void *sm_sasl_malloc __P((unsigned long));
extern void sm_sasl_free __P((void *));
#endif /* SASL */
/*
** USERSMTP -- run SMTP protocol from the user end.
**
** This protocol is described in RFC821.
*/
#define SMTPCLOSING 421 /* "Service Shutting Down" */
#define ENHSCN(e, d) ((e) == NULL ? (d) : (e))
#define ENHSCN_RPOOL(e, d, rpool) \
((e) == NULL ? (d) : sm_rpool_strdup_x(rpool, e))
static char SmtpMsgBuffer[MAXLINE]; /* buffer for commands */
static char SmtpReplyBuffer[MAXLINE]; /* buffer for replies */
static bool SmtpNeedIntro; /* need "while talking" in transcript */
/*
** SMTPINIT -- initialize SMTP.
**
** Opens the connection and sends the initial protocol.
**
** Parameters:
** m -- mailer to create connection to.
** mci -- the mailer connection info.
** e -- the envelope.
** onlyhelo -- send only helo command?
**
** Returns:
** none.
**
** Side Effects:
** creates connection and sends initial protocol.
*/
void
smtpinit(m, mci, e, onlyhelo)
MAILER *m;
register MCI *mci;
ENVELOPE *e;
bool onlyhelo;
{
register int r;
int state;
register char *p;
register char *hn;
char *enhsc;
enhsc = NULL;
if (tTd(18, 1))
{
sm_dprintf("smtpinit ");
mci_dump(sm_debug_file(), mci, false);
}
/*
** Open the connection to the mailer.
*/
SmtpError[0] = '\0';
SmtpMsgBuffer[0] = '\0';
CurHostName = mci->mci_host; /* XXX UGLY XXX */
if (CurHostName == NULL)
CurHostName = MyHostName;
SmtpNeedIntro = true;
state = mci->mci_state;
switch (state)
{
case MCIS_MAIL:
case MCIS_RCPT:
case MCIS_DATA:
/* need to clear old information */
smtprset(m, mci, e);
/* FALLTHROUGH */
case MCIS_OPEN:
if (!onlyhelo)
return;
break;
case MCIS_ERROR:
case MCIS_QUITING:
case MCIS_SSD:
/* shouldn't happen */
smtpquit(m, mci, e);
/* FALLTHROUGH */
case MCIS_CLOSED:
syserr("451 4.4.0 smtpinit: state CLOSED (was %d)", state);
return;
case MCIS_OPENING:
break;
}
if (onlyhelo)
goto helo;
mci->mci_state = MCIS_OPENING;
clrsessenvelope(e);
/*
** Get the greeting message.
** This should appear spontaneously. Give it five minutes to
** happen.
*/
SmtpPhase = mci->mci_phase = "client greeting";
sm_setproctitle(true, e, "%s %s: %s",
qid_printname(e), CurHostName, mci->mci_phase);
r = reply(m, mci, e, TimeOuts.to_initial, esmtp_check, NULL, XS_GREET);
if (r < 0)
goto tempfail1;
if (REPLYTYPE(r) == 4)
goto tempfail2;
if (REPLYTYPE(r) != 2)
goto unavailable;
/*
** Send the HELO command.
** My mother taught me to always introduce myself.
*/
helo:
if (bitnset(M_ESMTP, m->m_flags) || bitnset(M_LMTP, m->m_flags))
mci->mci_flags |= MCIF_ESMTP;
hn = mci->mci_heloname ? mci->mci_heloname : MyHostName;
tryhelo:
#if _FFR_IGNORE_EXT_ON_HELO
mci->mci_flags &= ~MCIF_HELO;
#endif /* _FFR_IGNORE_EXT_ON_HELO */
if (bitnset(M_LMTP, m->m_flags))
{
smtpmessage("LHLO %s", m, mci, hn);
SmtpPhase = mci->mci_phase = "client LHLO";
}
else if (bitset(MCIF_ESMTP, mci->mci_flags) &&
!bitnset(M_FSMTP, m->m_flags))
{
smtpmessage("EHLO %s", m, mci, hn);
SmtpPhase = mci->mci_phase = "client EHLO";
}
else
{
smtpmessage("HELO %s", m, mci, hn);
SmtpPhase = mci->mci_phase = "client HELO";
#if _FFR_IGNORE_EXT_ON_HELO
mci->mci_flags |= MCIF_HELO;
#endif /* _FFR_IGNORE_EXT_ON_HELO */
}
sm_setproctitle(true, e, "%s %s: %s", qid_printname(e),
CurHostName, mci->mci_phase);
r = reply(m, mci, e,
bitnset(M_LMTP, m->m_flags) ? TimeOuts.to_lhlo
: TimeOuts.to_helo,
helo_options, NULL, XS_EHLO);
if (r < 0)
goto tempfail1;
else if (REPLYTYPE(r) == 5)
{
if (bitset(MCIF_ESMTP, mci->mci_flags) &&
!bitnset(M_LMTP, m->m_flags))
{
/* try old SMTP instead */
mci->mci_flags &= ~MCIF_ESMTP;
goto tryhelo;
}
goto unavailable;
}
else if (REPLYTYPE(r) != 2)
goto tempfail2;
/*
** Check to see if we actually ended up talking to ourself.
** This means we didn't know about an alias or MX, or we managed
** to connect to an echo server.
*/
p = strchr(&SmtpReplyBuffer[4], ' ');
if (p != NULL)
*p = '\0';
if (!bitnset(M_NOLOOPCHECK, m->m_flags) &&
!bitnset(M_LMTP, m->m_flags) &&
sm_strcasecmp(&SmtpReplyBuffer[4], MyHostName) == 0)
{
syserr("553 5.3.5 %s config error: mail loops back to me (MX problem?)",
CurHostName);
mci_setstat(mci, EX_CONFIG, "5.3.5",
"553 5.3.5 system config error");
mci->mci_errno = 0;
smtpquit(m, mci, e);
return;
}
/*
** If this is expected to be another sendmail, send some internal
** commands.
** If we're running as MSP, "propagate" -v flag if possible.
*/
if ((UseMSP && Verbose && bitset(MCIF_VERB, mci->mci_flags))
# if !_FFR_DEPRECATE_MAILER_FLAG_I
|| bitnset(M_INTERNAL, m->m_flags)
# endif /* !_FFR_DEPRECATE_MAILER_FLAG_I */
)
{
/* tell it to be verbose */
smtpmessage("VERB", m, mci);
r = reply(m, mci, e, TimeOuts.to_miscshort, NULL, &enhsc,
XS_DEFAULT);
if (r < 0)
goto tempfail1;
}
if (mci->mci_state != MCIS_CLOSED)
{
mci->mci_state = MCIS_OPEN;
return;
}
/* got a 421 error code during startup */
tempfail1:
mci_setstat(mci, EX_TEMPFAIL, ENHSCN(enhsc, "4.4.2"), NULL);
if (mci->mci_state != MCIS_CLOSED)
smtpquit(m, mci, e);
return;
tempfail2:
/* XXX should use code from other end iff ENHANCEDSTATUSCODES */
mci_setstat(mci, EX_TEMPFAIL, ENHSCN(enhsc, "4.5.0"),
SmtpReplyBuffer);
if (mci->mci_state != MCIS_CLOSED)
smtpquit(m, mci, e);
return;
unavailable:
mci_setstat(mci, EX_UNAVAILABLE, "5.5.0", SmtpReplyBuffer);
smtpquit(m, mci, e);
return;
}
/*
** ESMTP_CHECK -- check to see if this implementation likes ESMTP protocol
**
** Parameters:
** line -- the response line.
** firstline -- set if this is the first line of the reply.
** m -- the mailer.
** mci -- the mailer connection info.
** e -- the envelope.
**
** Returns:
** none.
*/
static void
esmtp_check(line, firstline, m, mci, e)
char *line;
bool firstline;
MAILER *m;
register MCI *mci;
ENVELOPE *e;
{
if (strstr(line, "ESMTP") != NULL)
mci->mci_flags |= MCIF_ESMTP;
/*
** Dirty hack below. Quoting the author:
** This was a response to people who wanted SMTP transmission to be
** just-send-8 by default. Essentially, you could put this tag into
** your greeting message to behave as though the F=8 flag was set on
** the mailer.
*/
if (strstr(line, "8BIT-OK") != NULL)
mci->mci_flags |= MCIF_8BITOK;
}
#if SASL
/* specify prototype so compiler can check calls */
static char *str_union __P((char *, char *, SM_RPOOL_T *));
/*
** STR_UNION -- create the union of two lists
**
** Parameters:
** s1, s2 -- lists of items (separated by single blanks).
** rpool -- resource pool from which result is allocated.
**
** Returns:
** the union of both lists.
*/
static char *
str_union(s1, s2, rpool)
char *s1, *s2;
SM_RPOOL_T *rpool;
{
char *hr, *h1, *h, *res;
int l1, l2, rl;
if (s1 == NULL || *s1 == '\0')
return s2;
if (s2 == NULL || *s2 == '\0')
return s1;
l1 = strlen(s1);
l2 = strlen(s2);
rl = l1 + l2;
if (rl <= 0)
{
sm_syslog(LOG_WARNING, NOQID,
"str_union: stringlen1=%d, stringlen2=%d, sum=%d, status=overflow",
l1, l2, rl);
res = NULL;
}
else
res = (char *) sm_rpool_malloc(rpool, rl + 2);
if (res == NULL)
{
if (l1 > l2)
return s1;
return s2;
}
(void) sm_strlcpy(res, s1, rl);
hr = res + l1;
h1 = s2;
h = s2;
/* walk through s2 */
while (h != NULL && *h1 != '\0')
{
/* is there something after the current word? */
if ((h = strchr(h1, ' ')) != NULL)
*h = '\0';
l1 = strlen(h1);
/* does the current word appear in s1 ? */
if (iteminlist(h1, s1, " ") == NULL)
{
/* add space as delimiter */
*hr++ = ' ';
/* copy the item */
memcpy(hr, h1, l1);
/* advance pointer in result list */
hr += l1;
*hr = '\0';
}
if (h != NULL)
{
/* there are more items */
*h = ' ';
h1 = h + 1;
}
}
return res;
}
#endif /* SASL */
/*
** HELO_OPTIONS -- process the options on a HELO line.
**
** Parameters:
** line -- the response line.
** firstline -- set if this is the first line of the reply.
** m -- the mailer.
** mci -- the mailer connection info.
** e -- the envelope (unused).
**
** Returns:
** none.
*/
static void
helo_options(line, firstline, m, mci, e)
char *line;
bool firstline;
MAILER *m;
register MCI *mci;
ENVELOPE *e;
{
register char *p;
#if _FFR_IGNORE_EXT_ON_HELO
static bool logged = false;
#endif /* _FFR_IGNORE_EXT_ON_HELO */
if (firstline)
{
mci_clr_extensions(mci);
#if _FFR_IGNORE_EXT_ON_HELO
logged = false;
#endif /* _FFR_IGNORE_EXT_ON_HELO */
return;
}
#if _FFR_IGNORE_EXT_ON_HELO
else if (bitset(MCIF_HELO, mci->mci_flags))
{
if (LogLevel > 8 && !logged)
{
sm_syslog(LOG_WARNING, NOQID,
"server=%s [%s] returned extensions despite HELO command",
macvalue(macid("{server_name}"), e),
macvalue(macid("{server_addr}"), e));
logged = true;
}
return;
}
#endif /* _FFR_IGNORE_EXT_ON_HELO */
if (strlen(line) < 5)
return;
line += 4;
p = strpbrk(line, " =");
if (p != NULL)
*p++ = '\0';
if (sm_strcasecmp(line, "size") == 0)
{
mci->mci_flags |= MCIF_SIZE;
if (p != NULL)
mci->mci_maxsize = atol(p);
}
else if (sm_strcasecmp(line, "8bitmime") == 0)
{
mci->mci_flags |= MCIF_8BITMIME;
mci->mci_flags &= ~MCIF_7BIT;
}
else if (sm_strcasecmp(line, "expn") == 0)
mci->mci_flags |= MCIF_EXPN;
else if (sm_strcasecmp(line, "dsn") == 0)
mci->mci_flags |= MCIF_DSN;
else if (sm_strcasecmp(line, "enhancedstatuscodes") == 0)
mci->mci_flags |= MCIF_ENHSTAT;
else if (sm_strcasecmp(line, "pipelining") == 0)
mci->mci_flags |= MCIF_PIPELINED;
else if (sm_strcasecmp(line, "verb") == 0)
mci->mci_flags |= MCIF_VERB;
#if STARTTLS
else if (sm_strcasecmp(line, "starttls") == 0)
mci->mci_flags |= MCIF_TLS;
#endif /* STARTTLS */
else if (sm_strcasecmp(line, "deliverby") == 0)
{
mci->mci_flags |= MCIF_DLVR_BY;
if (p != NULL)
mci->mci_min_by = atol(p);
}
#if SASL
else if (sm_strcasecmp(line, "auth") == 0)
{
if (p != NULL && *p != '\0' &&
!bitset(MCIF_AUTH2, mci->mci_flags))
{
if (mci->mci_saslcap != NULL)
{
/*
** Create the union with previous auth
** offerings because we recognize "auth "
** and "auth=" (old format).
*/
mci->mci_saslcap = str_union(mci->mci_saslcap,
p, mci->mci_rpool);
mci->mci_flags |= MCIF_AUTH2;
}
else
{
int l;
l = strlen(p) + 1;
mci->mci_saslcap = (char *)
sm_rpool_malloc(mci->mci_rpool, l);
if (mci->mci_saslcap != NULL)
{
(void) sm_strlcpy(mci->mci_saslcap, p,
l);
mci->mci_flags |= MCIF_AUTH;
}
}
}
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "AUTH flags=%lx, mechs=%s",
mci->mci_flags, mci->mci_saslcap);
}
#endif /* SASL */
}
#if SASL
static int getsimple __P((void *, int, const char **, unsigned *));
static int getsecret __P((sasl_conn_t *, void *, int, sasl_secret_t **));
static int saslgetrealm __P((void *, int, const char **, const char **));
static int readauth __P((char *, bool, SASL_AI_T *m, SM_RPOOL_T *));
static int getauth __P((MCI *, ENVELOPE *, SASL_AI_T *));
static char *removemech __P((char *, char *, SM_RPOOL_T *));
static int attemptauth __P((MAILER *, MCI *, ENVELOPE *, SASL_AI_T *));
static sasl_callback_t callbacks[] =
{
{ SASL_CB_GETREALM, (sasl_callback_ft)&saslgetrealm, NULL },
#define CB_GETREALM_IDX 0
{ SASL_CB_PASS, (sasl_callback_ft)&getsecret, NULL },
#define CB_PASS_IDX 1
{ SASL_CB_USER, (sasl_callback_ft)&getsimple, NULL },
#define CB_USER_IDX 2
{ SASL_CB_AUTHNAME, (sasl_callback_ft)&getsimple, NULL },
#define CB_AUTHNAME_IDX 3
{ SASL_CB_VERIFYFILE, (sasl_callback_ft)&safesaslfile, NULL },
#define CB_SAFESASL_IDX 4
{ SASL_CB_LIST_END, NULL, NULL }
};
/*
** INIT_SASL_CLIENT -- initialize client side of Cyrus-SASL
**
** Parameters:
** none.
**
** Returns:
** SASL_OK -- if successful.
** SASL error code -- otherwise.
**
** Side Effects:
** checks/sets sasl_clt_init.
**
** Note:
** Callbacks are ignored if sasl_client_init() has
** been called before (by a library such as libnss_ldap)
*/
static bool sasl_clt_init = false;
static int
init_sasl_client()
{
int result;
if (sasl_clt_init)
return SASL_OK;
result = sasl_client_init(callbacks);
/* should we retry later again or just remember that it failed? */
if (result == SASL_OK)
sasl_clt_init = true;
return result;
}
/*
** STOP_SASL_CLIENT -- shutdown client side of Cyrus-SASL
**
** Parameters:
** none.
**
** Returns:
** none.
**
** Side Effects:
** checks/sets sasl_clt_init.
*/
void
stop_sasl_client()
{
if (!sasl_clt_init)
return;
sasl_clt_init = false;
sasl_done();
}
/*
** GETSASLDATA -- process the challenges from the SASL protocol
**
** This gets the relevant sasl response data out of the reply
** from the server.
**
** Parameters:
** line -- the response line.
** firstline -- set if this is the first line of the reply.
** m -- the mailer.
** mci -- the mailer connection info.
** e -- the envelope (unused).
**
** Returns:
** none.
*/
static void getsasldata __P((char *, bool, MAILER *, MCI *, ENVELOPE *));
static void
getsasldata(line, firstline, m, mci, e)
char *line;
bool firstline;
MAILER *m;
register MCI *mci;
ENVELOPE *e;
{
int len;
int result;
# if SASL < 20000
char *out;
# endif /* SASL < 20000 */
/* if not a continue we don't care about it */
len = strlen(line);
if ((len <= 4) ||
(line[0] != '3') ||
!isascii(line[1]) || !isdigit(line[1]) ||
!isascii(line[2]) || !isdigit(line[2]))
{
SM_FREE_CLR(mci->mci_sasl_string);
return;
}
/* forget about "334 " */
line += 4;
len -= 4;
# if SASL >= 20000
/* XXX put this into a macro/function? It's duplicated below */
if (mci->mci_sasl_string != NULL)
{
if (mci->mci_sasl_string_len <= len)
{
sm_free(mci->mci_sasl_string); /* XXX */
mci->mci_sasl_string = xalloc(len + 1);
}
}
else
mci->mci_sasl_string = xalloc(len + 1);
result = sasl_decode64(line, len, mci->mci_sasl_string, len + 1,
(unsigned int *) &mci->mci_sasl_string_len);
if (result != SASL_OK)
{
mci->mci_sasl_string_len = 0;
*mci->mci_sasl_string = '\0';
}
# else /* SASL >= 20000 */
out = (char *) sm_rpool_malloc_x(mci->mci_rpool, len + 1);
result = sasl_decode64(line, len, out, (unsigned int *) &len);
if (result != SASL_OK)
{
len = 0;
*out = '\0';
}
/*
** mci_sasl_string is "shared" with Cyrus-SASL library; hence
** it can't be in an rpool unless we use the same memory
** management mechanism (with same rpool!) for Cyrus SASL.
*/
if (mci->mci_sasl_string != NULL)
{
if (mci->mci_sasl_string_len <= len)
{
sm_free(mci->mci_sasl_string); /* XXX */
mci->mci_sasl_string = xalloc(len + 1);
}
}
else
mci->mci_sasl_string = xalloc(len + 1);
memcpy(mci->mci_sasl_string, out, len);
mci->mci_sasl_string[len] = '\0';
mci->mci_sasl_string_len = len;
# endif /* SASL >= 20000 */
return;
}
/*
** READAUTH -- read auth values from a file
**
** Parameters:
** filename -- name of file to read.
** safe -- if set, this is a safe read.
** sai -- where to store auth_info.
** rpool -- resource pool for sai.
**
** Returns:
** EX_OK -- data succesfully read.
** EX_UNAVAILABLE -- no valid filename.
** EX_TEMPFAIL -- temporary failure.
*/
static char *sasl_info_name[] =
{
"user id",
"authentication id",
"password",
"realm",
"mechlist"
};
static int
readauth(filename, safe, sai, rpool)
char *filename;
bool safe;
SASL_AI_T *sai;
SM_RPOOL_T *rpool;
{
SM_FILE_T *f;
long sff;
pid_t pid;
int lc;
char *s;
char buf[MAXLINE];
if (filename == NULL || filename[0] == '\0')
return EX_UNAVAILABLE;
#if !_FFR_ALLOW_SASLINFO
/*
** make sure we don't use a program that is not
** accesible to the user who specified a different authinfo file.
** However, currently we don't pass this info (authinfo file
** specified by user) around, so we just turn off program access.
*/
if (filename[0] == '|')
{
auto int fd;
int i;
char *p;
char *argv[MAXPV + 1];
i = 0;
for (p = strtok(&filename[1], " \t"); p != NULL;
p = strtok(NULL, " \t"))
{
if (i >= MAXPV)
break;
argv[i++] = p;
}
argv[i] = NULL;
pid = prog_open(argv, &fd, CurEnv);
if (pid < 0)
f = NULL;
else
f = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
(void *) &fd, SM_IO_RDONLY, NULL);
}
else
#endif /* !_FFR_ALLOW_SASLINFO */
{
pid = -1;
sff = SFF_REGONLY|SFF_SAFEDIRPATH|SFF_NOWLINK
|SFF_NOGWFILES|SFF_NOWWFILES|SFF_NOWRFILES;
# if _FFR_GROUPREADABLEAUTHINFOFILE
if (!bitnset(DBS_GROUPREADABLEAUTHINFOFILE, DontBlameSendmail))
# endif /* _FFR_GROUPREADABLEAUTHINFOFILE */
sff |= SFF_NOGRFILES;
if (DontLockReadFiles)
sff |= SFF_NOLOCK;
#if _FFR_ALLOW_SASLINFO
/*
** XXX: make sure we don't read or open files that are not
** accesible to the user who specified a different authinfo
** file.
*/
sff |= SFF_MUSTOWN;
#else /* _FFR_ALLOW_SASLINFO */
if (safe)
sff |= SFF_OPENASROOT;
#endif /* _FFR_ALLOW_SASLINFO */
f = safefopen(filename, O_RDONLY, 0, sff);
}
if (f == NULL)
{
if (LogLevel > 5)
sm_syslog(LOG_ERR, NOQID,
"AUTH=client, error: can't open %s: %s",
filename, sm_errstring(errno));
return EX_TEMPFAIL;
}
lc = 0;
while (lc <= SASL_MECHLIST &&
sm_io_fgets(f, SM_TIME_DEFAULT, buf, sizeof(buf)) != NULL)
{
if (buf[0] != '#')
{
(*sai)[lc] = sm_rpool_strdup_x(rpool, buf);
if ((s = strchr((*sai)[lc], '\n')) != NULL)
*s = '\0';
lc++;
}
}
(void) sm_io_close(f, SM_TIME_DEFAULT);
if (pid > 0)
(void) waitfor(pid);
if (lc < SASL_PASSWORD)
{
if (LogLevel > 8)
sm_syslog(LOG_ERR, NOQID,
"AUTH=client, error: can't read %s from %s",
sasl_info_name[lc + 1], filename);
return EX_TEMPFAIL;
}
return EX_OK;
}
/*
** GETAUTH -- get authinfo from ruleset call
**
** {server_name}, {server_addr} must be set
**
** Parameters:
** mci -- the mailer connection structure.
** e -- the envelope (including the sender to specify).
** sai -- pointer to authinfo (result).
**
** Returns:
** EX_OK -- ruleset was succesfully called, data may not
** be available, sai must be checked.
** EX_UNAVAILABLE -- ruleset unavailable (or failed).
** EX_TEMPFAIL -- temporary failure (from ruleset).
**
** Side Effects:
** Fills in sai if successful.
*/
static int
getauth(mci, e, sai)
MCI *mci;
ENVELOPE *e;
SASL_AI_T *sai;
{
int i, r, l, got, ret;
char **pvp;
char pvpbuf[PSBUFSIZE];
r = rscap("authinfo", macvalue(macid("{server_name}"), e),
macvalue(macid("{server_addr}"), e), e,
&pvp, pvpbuf, sizeof(pvpbuf));
if (r != EX_OK)
return EX_UNAVAILABLE;
/* other than expected return value: ok (i.e., no auth) */
if (pvp == NULL || pvp[0] == NULL || (pvp[0][0] & 0377) != CANONNET)
return EX_OK;
if (pvp[1] != NULL && sm_strncasecmp(pvp[1], "temp", 4) == 0)
return EX_TEMPFAIL;
/*
** parse the data, put it into sai
** format: "TDstring" (including the '"' !)
** where T is a tag: 'U', ...
** D is a delimiter: ':' or '='
*/
ret = EX_OK; /* default return value */
i = 0;
got = 0;
while (i < SASL_ENTRIES)
{
if (pvp[i + 1] == NULL)
break;
if (pvp[i + 1][0] != '"')
break;
switch (pvp[i + 1][1])
{
case 'U':
case 'u':
r = SASL_USER;
break;
case 'I':
case 'i':
r = SASL_AUTHID;
break;
case 'P':
case 'p':
r = SASL_PASSWORD;
break;
case 'R':
case 'r':
r = SASL_DEFREALM;
break;
case 'M':
case 'm':
r = SASL_MECHLIST;
break;
default:
goto fail;
}
l = strlen(pvp[i + 1]);
/* check syntax */
if (l <= 3 || pvp[i + 1][l - 1] != '"')
goto fail;
/* remove closing quote */
pvp[i + 1][l - 1] = '\0';
/* remove "TD and " */
l -= 4;
(*sai)[r] = (char *) sm_rpool_malloc(mci->mci_rpool, l + 1);
if ((*sai)[r] == NULL)
goto tempfail;
if (pvp[i + 1][2] == ':')
{
/* ':text' (just copy) */
(void) sm_strlcpy((*sai)[r], pvp[i + 1] + 3, l + 1);
got |= 1 << r;
}
else if (pvp[i + 1][2] == '=')
{
unsigned int len;
/* '=base64' (decode) */
# if SASL >= 20000
ret = sasl_decode64(pvp[i + 1] + 3,
(unsigned int) l, (*sai)[r],
(unsigned int) l + 1, &len);
# else /* SASL >= 20000 */
ret = sasl_decode64(pvp[i + 1] + 3,
(unsigned int) l, (*sai)[r], &len);
# endif /* SASL >= 20000 */
if (ret != SASL_OK)
goto fail;
got |= 1 << r;
}
else
goto fail;
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "getauth %s=%s",
sasl_info_name[r], (*sai)[r]);
++i;
}
/* did we get the expected data? */
/* XXX: EXTERNAL mechanism only requires (and only uses) SASL_USER */
if (!(bitset(SASL_USER_BIT|SASL_AUTHID_BIT, got) &&
bitset(SASL_PASSWORD_BIT, got)))
goto fail;
/* no authid? copy uid */
if (!bitset(SASL_AUTHID_BIT, got))
{
l = strlen((*sai)[SASL_USER]) + 1;
(*sai)[SASL_AUTHID] = (char *) sm_rpool_malloc(mci->mci_rpool,
l + 1);
if ((*sai)[SASL_AUTHID] == NULL)
goto tempfail;
(void) sm_strlcpy((*sai)[SASL_AUTHID], (*sai)[SASL_USER], l);
}
/* no uid? copy authid */
if (!bitset(SASL_USER_BIT, got))
{
l = strlen((*sai)[SASL_AUTHID]) + 1;
(*sai)[SASL_USER] = (char *) sm_rpool_malloc(mci->mci_rpool,
l + 1);
if ((*sai)[SASL_USER] == NULL)
goto tempfail;
(void) sm_strlcpy((*sai)[SASL_USER], (*sai)[SASL_AUTHID], l);
}
return EX_OK;
tempfail:
ret = EX_TEMPFAIL;
fail:
if (LogLevel > 8)
sm_syslog(LOG_WARNING, NOQID,
"AUTH=client, relay=%.64s [%.16s], authinfo %sfailed",
macvalue(macid("{server_name}"), e),
macvalue(macid("{server_addr}"), e),
ret == EX_TEMPFAIL ? "temp" : "");
for (i = 0; i <= SASL_MECHLIST; i++)
(*sai)[i] = NULL; /* just clear; rpool */
return ret;
}
# if SASL >= 20000
/*
** GETSIMPLE -- callback to get userid or authid
**
** Parameters:
** context -- sai
** id -- what to do
** result -- (pointer to) result
** len -- (pointer to) length of result
**
** Returns:
** OK/failure values
*/
static int
getsimple(context, id, result, len)
void *context;
int id;
const char **result;
unsigned *len;
{
SASL_AI_T *sai;
if (result == NULL || context == NULL)
return SASL_BADPARAM;
sai = (SASL_AI_T *) context;
switch (id)
{
case SASL_CB_USER:
*result = (*sai)[SASL_USER];
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "AUTH username '%s'",
*result);
if (len != NULL)
*len = *result != NULL ? strlen(*result) : 0;
break;
case SASL_CB_AUTHNAME:
*result = (*sai)[SASL_AUTHID];
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "AUTH authid '%s'",
*result);
if (len != NULL)
*len = *result != NULL ? strlen(*result) : 0;
break;
case SASL_CB_LANGUAGE:
*result = NULL;
if (len != NULL)
*len = 0;
break;
default:
return SASL_BADPARAM;
}
return SASL_OK;
}
/*
** GETSECRET -- callback to get password
**
** Parameters:
** conn -- connection information
** context -- sai
** id -- what to do
** psecret -- (pointer to) result
**
** Returns:
** OK/failure values
*/
static int
getsecret(conn, context, id, psecret)
sasl_conn_t *conn;
SM_UNUSED(void *context);
int id;
sasl_secret_t **psecret;
{
int len;
char *authpass;
MCI *mci;
if (conn == NULL || psecret == NULL || id != SASL_CB_PASS)
return SASL_BADPARAM;
mci = (MCI *) context;
authpass = mci->mci_sai[SASL_PASSWORD];
len = strlen(authpass);
/*
** use an rpool because we are responsible for free()ing the secret,
** but we can't free() it until after the auth completes
*/
*psecret = (sasl_secret_t *) sm_rpool_malloc(mci->mci_rpool,
sizeof(sasl_secret_t) +
len + 1);
if (*psecret == NULL)
return SASL_FAIL;
(void) sm_strlcpy((char *) (*psecret)->data, authpass, len + 1);
(*psecret)->len = (unsigned long) len;
return SASL_OK;
}
# else /* SASL >= 20000 */
/*
** GETSIMPLE -- callback to get userid or authid
**
** Parameters:
** context -- sai
** id -- what to do
** result -- (pointer to) result
** len -- (pointer to) length of result
**
** Returns:
** OK/failure values
*/
static int
getsimple(context, id, result, len)
void *context;
int id;
const char **result;
unsigned *len;
{
char *h, *s;
# if SASL > 10509
bool addrealm;
# endif /* SASL > 10509 */
size_t l;
SASL_AI_T *sai;
char *authid = NULL;
if (result == NULL || context == NULL)
return SASL_BADPARAM;
sai = (SASL_AI_T *) context;
/*
** Unfortunately it is not clear whether this routine should
** return a copy of a string or just a pointer to a string.
** The Cyrus-SASL plugins treat these return values differently, e.g.,
** plugins/cram.c free()s authid, plugings/digestmd5.c does not.
** The best solution to this problem is to fix Cyrus-SASL, but it
** seems there is nobody who creates patches... Hello CMU!?
** The second best solution is to have flags that tell this routine
** whether to return an malloc()ed copy.
** The next best solution is to always return an malloc()ed copy,
** and suffer from some memory leak, which is ugly for persistent
** queue runners.
** For now we go with the last solution...
** We can't use rpools (which would avoid this particular problem)
** as explained in sasl.c.
*/
switch (id)
{
case SASL_CB_USER:
l = strlen((*sai)[SASL_USER]) + 1;
s = sm_sasl_malloc(l);
if (s == NULL)
{
if (len != NULL)
*len = 0;
*result = NULL;
return SASL_NOMEM;
}
(void) sm_strlcpy(s, (*sai)[SASL_USER], l);
*result = s;
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "AUTH username '%s'",
*result);
if (len != NULL)
*len = *result != NULL ? strlen(*result) : 0;
break;
case SASL_CB_AUTHNAME:
h = (*sai)[SASL_AUTHID];
# if SASL > 10509
/* XXX maybe other mechanisms too?! */
addrealm = (*sai)[SASL_MECH] != NULL &&
sm_strcasecmp((*sai)[SASL_MECH], "CRAM-MD5") == 0;
/*
** Add realm to authentication id unless authid contains
** '@' (i.e., a realm) or the default realm is empty.
*/
if (addrealm && h != NULL && strchr(h, '@') == NULL)
{
/* has this been done before? */
if ((*sai)[SASL_ID_REALM] == NULL)
{
char *realm;
realm = (*sai)[SASL_DEFREALM];
/* do not add an empty realm */
if (*realm == '\0')
{
authid = h;
(*sai)[SASL_ID_REALM] = NULL;
}
else
{
l = strlen(h) + strlen(realm) + 2;
/* should use rpool, but from where? */
authid = sm_sasl_malloc(l);
if (authid != NULL)
{
(void) sm_snprintf(authid, l,
"%s@%s",
h, realm);
(*sai)[SASL_ID_REALM] = authid;
}
else
{
authid = h;
(*sai)[SASL_ID_REALM] = NULL;
}
}
}
else
authid = (*sai)[SASL_ID_REALM];
}
else
# endif /* SASL > 10509 */
authid = h;
l = strlen(authid) + 1;
s = sm_sasl_malloc(l);
if (s == NULL)
{
if (len != NULL)
*len = 0;
*result = NULL;
return SASL_NOMEM;
}
(void) sm_strlcpy(s, authid, l);
*result = s;
if (tTd(95, 5))
sm_syslog(LOG_DEBUG, NOQID, "AUTH authid '%s'",
*result);
if (len != NULL)
*len = authid ? strlen(authid) : 0;
break;
case SASL_CB_LANGUAGE:
*result = NULL;
if (len != NULL)
*len = 0;
break;
default:
return SASL_BADPARAM;
}
return SASL_OK;
}
/*
** GETSECRET -- callback to get password
**
** Parameters:
** conn -- connection information
** context -- sai
** id -- what to do
** psecret -- (pointer to) result
**
** Returns:
** OK/failure values
*/
static int
getsecret(conn, context, id, psecret)
sasl_conn_t *conn;
SM_UNUSED(void *context);
int id;
sasl_secret_t **psecret;
{
int len;
char *authpass;
SASL_AI_T *sai;
if (conn == NULL || psecret == NULL || id != SASL_CB_PASS)
return SASL_BADPARAM;
sai = (SASL_AI_T *) context;
authpass = (*sai)[SASL_PASSWORD];
len = strlen(authpass);
*psecret = (sasl_secret_t *) sm_sasl_malloc(sizeof(sasl_secret_t) +
len + 1);
if (*psecret == NULL)
return SASL_FAIL;
(void) sm_strlcpy((*psecret)->data, authpass, len + 1);
(*psecret)->len = (unsigned long) len;
return SASL_OK;
}
# endif /* SASL >= 20000 */
/*
** SAFESASLFILE -- callback for sasl: is file safe?
**
** Parameters:
** context -- pointer to context between invocations (unused)
** file -- name of file to check
** type -- type of file to check
**
** Returns:
** SASL_OK -- file can be used
** SASL_CONTINUE -- don't use file
** SASL_FAIL -- failure (not used here)
**
*/
int
#if SASL > 10515
safesaslfile(context, file, type)
#else /* SASL > 10515 */
safesaslfile(context, file)
#endif /* SASL > 10515 */
void *context;
# if SASL >= 20000
const char *file;
# else /* SASL >= 20000 */
char *file;
# endif /* SASL >= 20000 */
#if SASL > 10515
# if SASL >= 20000
sasl_verify_type_t type;
# else /* SASL >= 20000 */
int type;
# endif /* SASL >= 20000 */
#endif /* SASL > 10515 */
{
long sff;
int r;
#if SASL <= 10515
size_t len;
#endif /* SASL <= 10515 */
char *p;
if (file == NULL || *file == '\0')
return SASL_OK;
sff = SFF_SAFEDIRPATH|SFF_NOWLINK|SFF_NOWWFILES|SFF_ROOTOK;
#if SASL <= 10515
if ((p = strrchr(file, '/')) == NULL)
p = file;
else
++p;
/* everything beside libs and .conf files must not be readable */
len = strlen(p);
if ((len <= 3 || strncmp(p, "lib", 3) != 0) &&
(len <= 5 || strncmp(p + len - 5, ".conf", 5) != 0))
{
if (!bitnset(DBS_GROUPREADABLESASLDBFILE, DontBlameSendmail))
sff |= SFF_NORFILES;
if (!bitnset(DBS_GROUPWRITABLESASLDBFILE, DontBlameSendmail))
sff |= SFF_NOGWFILES;
}
#else /* SASL <= 10515 */
/* files containing passwords should be not readable */
if (type == SASL_VRFY_PASSWD)
{
if (bitnset(DBS_GROUPREADABLESASLDBFILE, DontBlameSendmail))
sff |= SFF_NOWRFILES;
else
sff |= SFF_NORFILES;
if (!bitnset(DBS_GROUPWRITABLESASLDBFILE, DontBlameSendmail))
sff |= SFF_NOGWFILES;
}
#endif /* SASL <= 10515 */
p = (char *) file;
if ((r = safefile(p, RunAsUid, RunAsGid, RunAsUserName, sff,
S_IRUSR, NULL)) == 0)
return SASL_OK;
if (LogLevel > (r != ENOENT ? 8 : 10))
sm_syslog(LOG_WARNING, NOQID, "error: safesasl(%s) failed: %s",
p, sm_errstring(r));
return SASL_CONTINUE;
}
/*
** SASLGETREALM -- return the realm for SASL
**
** return the realm for the client
**
** Parameters:
** context -- context shared between invocations
** availrealms -- list of available realms
** {realm, realm, ...}
** result -- pointer to result
**
** Returns:
** failure/success
*/
static int
saslgetrealm(context, id, availrealms, result)
void *context;
int id;
const char **availrealms;
const char **result;
{
char *r;
SASL_AI_T *sai;
sai = (SASL_AI_T *) context;
if (sai == NULL)
return SASL_FAIL;
r = (*sai)[SASL_DEFREALM];
if (LogLevel > 12)
sm_syslog(LOG_INFO, NOQID,
"AUTH=client, realm=%s, available realms=%s",
r == NULL ? "<No Realm>" : r,
(availrealms == NULL || *availrealms == NULL)
? "<No Realms>" : *availrealms);
/* check whether context is in list */
if (availrealms != NULL && *availrealms != NULL)
{
if (iteminlist(context, (char *)(*availrealms + 1), " ,}") ==
NULL)
{
if (LogLevel > 8)
sm_syslog(LOG_ERR, NOQID,
"AUTH=client, realm=%s not in list=%s",
r, *availrealms);
return SASL_FAIL;
}
}
*result = r;
return SASL_OK;
}
/*
** ITEMINLIST -- does item appear in list?
**
** Check whether item appears in list (which must be separated by a
** character in delim) as a "word", i.e. it must appear at the begin
** of the list or after a space, and it must end with a space or the
** end of the list.
**
** Parameters:
** item -- item to search.
** list -- list of items.
** delim -- list of delimiters.
**
** Returns:
** pointer to occurrence (NULL if not found).
*/
char *
iteminlist(item, list, delim)
char *item;
char *list;
char *delim;
{
char *s;
int len;
if (list == NULL || *list == '\0')
return NULL;
if (item == NULL || *item == '\0')
return NULL;
s = list;
len = strlen(item);
while (s != NULL && *s != '\0')
{
if (sm_strncasecmp(s, item, len) == 0 &&
(s[len] == '\0' || strchr(delim, s[len]) != NULL))
return s;
s = strpbrk(s, delim);
if (s != NULL)
while (*++s == ' ')
continue;
}
return NULL;
}
/*
** REMOVEMECH -- remove item [rem] from list [list]
**
** Parameters:
** rem -- item to remove
** list -- list of items
** rpool -- resource pool from which result is allocated.
**
** Returns:
** pointer to new list (NULL in case of error).
*/
static char *
removemech(rem, list, rpool)
char *rem;
char *list;
SM_RPOOL_T *rpool;
{
char *ret;
char *needle;
int len;
if (list == NULL)
return NULL;
if (rem == NULL || *rem == '\0')
{
/* take out what? */
return NULL;
}
/* find the item in the list */
if ((needle = iteminlist(rem, list, " ")) == NULL)
{
/* not in there: return original */
return list;
}
/* length of string without rem */
len = strlen(list) - strlen(rem);
if (len <= 0)
{
ret = (char *) sm_rpool_malloc_x(rpool, 1);
*ret = '\0';
return ret;
}
ret = (char *) sm_rpool_malloc_x(rpool, len);
memset(ret, '\0', len);
/* copy from start to removed item */
memcpy(ret, list, needle - list);
/* length of rest of string past removed item */
len = strlen(needle) - strlen(rem) - 1;
if (len > 0)
{
/* not last item -- copy into string */
memcpy(ret + (needle - list),
list + (needle - list) + strlen(rem) + 1,
len);
}
else
ret[(needle - list) - 1] = '\0';
return ret;
}
/*
** ATTEMPTAUTH -- try to AUTHenticate using one mechanism
**
** Parameters:
** m -- the mailer.
** mci -- the mailer connection structure.
** e -- the envelope (including the sender to specify).
** sai - sasl authinfo
**
** Returns:
** EX_OK -- authentication was successful.
** EX_NOPERM -- authentication failed.
** EX_IOERR -- authentication dialogue failed (I/O problem?).
** EX_TEMPFAIL -- temporary failure.
**
*/
static int
attemptauth(m, mci, e, sai)
MAILER *m;
MCI *mci;
ENVELOPE *e;
SASL_AI_T *sai;
{
int saslresult, smtpresult;
# if SASL >= 20000
sasl_ssf_t ssf;
const char *auth_id;
const char *out;
# else /* SASL >= 20000 */
sasl_external_properties_t ssf;
char *out;
# endif /* SASL >= 20000 */
unsigned int outlen;
sasl_interact_t *client_interact = NULL;
char *mechusing;
sasl_security_properties_t ssp;
/* MUST NOT be a multiple of 4: bug in some sasl_encode64() versions */
char in64[MAXOUTLEN + 1];
#if NETINET || (NETINET6 && SASL >= 20000)
extern SOCKADDR CurHostAddr;
#endif /* NETINET || (NETINET6 && SASL >= 20000) */
/* no mechanism selected (yet) */
(*sai)[SASL_MECH] = NULL;
/* dispose old connection */
if (mci->mci_conn != NULL)
sasl_dispose(&(mci->mci_conn));
/* make a new client sasl connection */
# if SASL >= 20000
/*
** We provide the callbacks again because global callbacks in
** sasl_client_init() are ignored if SASL has been initialized
** before, for example, by a library such as libnss-ldap.
*/
saslresult = sasl_client_new(bitnset(M_LMTP, m->m_flags) ? "lmtp"
: "smtp",
CurHostName, NULL, NULL, callbacks, 0,
&mci->mci_conn);
# else /* SASL >= 20000 */
saslresult = sasl_client_new(bitnset(M_LMTP, m->m_flags) ? "lmtp"
: "smtp",
CurHostName, NULL, 0, &mci->mci_conn);
# endif /* SASL >= 20000 */
if (saslresult != SASL_OK)
return EX_TEMPFAIL;
/* set properties */
(void) memset(&ssp, '\0', sizeof(ssp));
/* XXX should these be options settable via .cf ? */
ssp.max_ssf = MaxSLBits;
ssp.maxbufsize = MAXOUTLEN;
# if 0
ssp.security_flags = SASL_SEC_NOPLAINTEXT;
# endif /* 0 */
saslresult = sasl_setprop(mci->mci_conn, SASL_SEC_PROPS, &ssp);
if (saslresult != SASL_OK)
return EX_TEMPFAIL;
# if SASL >= 20000
/* external security strength factor, authentication id */
ssf = 0;
auth_id = NULL;
# if STARTTLS
out = macvalue(macid("{cert_subject}"), e);
if (out != NULL && *out != '\0')
auth_id = out;
out = macvalue(macid("{cipher_bits}"), e);
if (out != NULL && *out != '\0')
ssf = atoi(out);
# endif /* STARTTLS */
saslresult = sasl_setprop(mci->mci_conn, SASL_SSF_EXTERNAL, &ssf);
if (saslresult != SASL_OK)
return EX_TEMPFAIL;
saslresult = sasl_setprop(mci->mci_conn, SASL_AUTH_EXTERNAL, auth_id);
if (saslresult != SASL_OK)
return EX_TEMPFAIL;
# if NETINET || NETINET6
/* set local/remote ipv4 addresses */
if (mci->mci_out != NULL && (
# if NETINET6
CurHostAddr.sa.sa_family == AF_INET6 ||
# endif /* NETINET6 */
CurHostAddr.sa.sa_family == AF_INET))
{
SOCKADDR_LEN_T addrsize;
SOCKADDR saddr_l;
char localip[60], remoteip[60];
switch (CurHostAddr.sa.sa_family)
{
case AF_INET:
addrsize = sizeof(struct sockaddr_in);
break;
# if NETINET6
case AF_INET6:
addrsize = sizeof(struct sockaddr_in6);
break;
# endif /* NETINET6 */
default:
break;
}
if (iptostring(&CurHostAddr, addrsize,
remoteip, sizeof(remoteip)))
{
if (sasl_setprop(mci->mci_conn, SASL_IPREMOTEPORT,
remoteip) != SASL_OK)
return EX_TEMPFAIL;
}
addrsize = sizeof(saddr_l);
if (getsockname(sm_io_getinfo(mci->mci_out, SM_IO_WHAT_FD,
NULL),
(struct sockaddr *) &saddr_l, &addrsize) == 0)
{
if (iptostring(&saddr_l, addrsize,
localip, sizeof(localip)))
{
if (sasl_setprop(mci->mci_conn,
SASL_IPLOCALPORT,
localip) != SASL_OK)
return EX_TEMPFAIL;
}
}
}
# endif /* NETINET || NETINET6 */
/* start client side of sasl */
saslresult = sasl_client_start(mci->mci_conn, mci->mci_saslcap,
&client_interact,
&out, &outlen,
(const char **) &mechusing);
# else /* SASL >= 20000 */
/* external security strength factor, authentication id */
ssf.ssf = 0;
ssf.auth_id = NULL;
# if STARTTLS
out = macvalue(macid("{cert_subject}"), e);
if (out != NULL && *out != '\0')
ssf.auth_id = out;
out = macvalue(macid("{cipher_bits}"), e);
if (out != NULL && *out != '\0')
ssf.ssf = atoi(out);
# endif /* STARTTLS */
saslresult = sasl_setprop(mci->mci_conn, SASL_SSF_EXTERNAL, &ssf);
if (saslresult != SASL_OK)
return EX_TEMPFAIL;
# if NETINET
/* set local/remote ipv4 addresses */
if (mci->mci_out != NULL && CurHostAddr.sa.sa_family == AF_INET)
{
SOCKADDR_LEN_T addrsize;
struct sockaddr_in saddr_l;
if (sasl_setprop(mci->mci_conn, SASL_IP_REMOTE,
(struct sockaddr_in *) &CurHostAddr)
!= SASL_OK)
return EX_TEMPFAIL;
addrsize = sizeof(struct sockaddr_in);
if (getsockname(sm_io_getinfo(mci->mci_out, SM_IO_WHAT_FD,
NULL),
(struct sockaddr *) &saddr_l, &addrsize) == 0)
{
if (sasl_setprop(mci->mci_conn, SASL_IP_LOCAL,
&saddr_l) != SASL_OK)
return EX_TEMPFAIL;
}
}
# endif /* NETINET */
/* start client side of sasl */
saslresult = sasl_client_start(mci->mci_conn, mci->mci_saslcap,
NULL, &client_interact,
&out, &outlen,
(const char **) &mechusing);
# endif /* SASL >= 20000 */
if (saslresult != SASL_OK && saslresult != SASL_CONTINUE)
{
if (saslresult == SASL_NOMECH && LogLevel > 8)
{
sm_syslog(LOG_NOTICE, e->e_id,
"AUTH=client, available mechanisms do not fulfill requirements");
}
return EX_TEMPFAIL;
}
/* just point current mechanism to the data in the sasl library */
(*sai)[SASL_MECH] = mechusing;
/* send the info across the wire */
if (out == NULL
/* login and digest-md5 up to 1.5.28 set out="" */
|| (outlen == 0 &&
(sm_strcasecmp(mechusing, "LOGIN") == 0 ||
sm_strcasecmp(mechusing, "DIGEST-MD5") == 0))
)
{
/* no initial response */
smtpmessage("AUTH %s", m, mci, mechusing);
}
else if (outlen == 0)
{
/*
** zero-length initial response, per RFC 2554 4.:
** "Unlike a zero-length client answer to a 334 reply, a zero-
** length initial response is sent as a single equals sign"
*/
smtpmessage("AUTH %s =", m, mci, mechusing);
}
else
{
saslresult = sasl_encode64(out, outlen, in64, sizeof(in64),
NULL);
if (saslresult != SASL_OK) /* internal error */
{
if (LogLevel > 8)
sm_syslog(LOG_ERR, e->e_id,
"encode64 for AUTH failed");
return EX_TEMPFAIL;
}
smtpmessage("AUTH %s %s", m, mci, mechusing, in64);
}
# if SASL < 20000
sm_sasl_free(out); /* XXX only if no rpool is used */
# endif /* SASL < 20000 */
/* get the reply */
smtpresult = reply(m, mci, e, TimeOuts.to_auth, getsasldata, NULL,
XS_AUTH);
for (;;)
{
/* check return code from server */
if (smtpresult == 235)
{
macdefine(&mci->mci_macro, A_TEMP, macid("{auth_type}"),
mechusing);
return EX_OK;
}
if (smtpresult == -1)
return EX_IOERR;
if (REPLYTYPE(smtpresult) == 5)
return EX_NOPERM; /* ugly, but ... */
if (REPLYTYPE(smtpresult) != 3)
{
/* should we fail deliberately, see RFC 2554 4. ? */
/* smtpmessage("*", m, mci); */
return EX_TEMPFAIL;
}
saslresult = sasl_client_step(mci->mci_conn,
mci->mci_sasl_string,
mci->mci_sasl_string_len,
&client_interact,
&out, &outlen);
if (saslresult != SASL_OK && saslresult != SASL_CONTINUE)
{
if (tTd(95, 5))
sm_dprintf("AUTH FAIL=%s (%d)\n",
sasl_errstring(saslresult, NULL, NULL),
saslresult);
/* fail deliberately, see RFC 2554 4. */
smtpmessage("*", m, mci);
/*
** but we should only fail for this authentication
** mechanism; how to do that?
*/
smtpresult = reply(m, mci, e, TimeOuts.to_auth,
getsasldata, NULL, XS_AUTH);
return EX_NOPERM;
}
if (outlen > 0)
{
saslresult = sasl_encode64(out, outlen, in64,
sizeof(in64), NULL);
if (saslresult != SASL_OK)
{
/* give an error reply to the other side! */
smtpmessage("*", m, mci);
return EX_TEMPFAIL;
}
}
else
in64[0] = '\0';
# if SASL < 20000
sm_sasl_free(out); /* XXX only if no rpool is used */
# endif /* SASL < 20000 */
smtpmessage("%s", m, mci, in64);
smtpresult = reply(m, mci, e, TimeOuts.to_auth,
getsasldata, NULL, XS_AUTH);
}
/* NOTREACHED */
}
/*
** SMTPAUTH -- try to AUTHenticate
**
** This will try mechanisms in the order the sasl library decided until:
** - there are no more mechanisms
** - a mechanism succeeds
** - the sasl library fails initializing
**
** Parameters:
** m -- the mailer.
** mci -- the mailer connection info.
** e -- the envelope.
**
** Returns:
** EX_OK -- authentication was successful
** EX_UNAVAILABLE -- authentication not possible, e.g.,
** no data available.
** EX_NOPERM -- authentication failed.
** EX_TEMPFAIL -- temporary failure.
**
** Notice: AuthInfo is used for all connections, hence we must
** return EX_TEMPFAIL only if we really want to retry, i.e.,
** iff getauth() tempfailed or getauth() was used and
** authentication tempfailed.
*/
int
smtpauth(m, mci, e)
MAILER *m;
MCI *mci;
ENVELOPE *e;
{
int result;
int i;
bool usedgetauth;
mci->mci_sasl_auth = false;
for (i = 0; i < SASL_MECH ; i++)
mci->mci_sai[i] = NULL;
result = getauth(mci, e, &(mci->mci_sai));
if (result == EX_TEMPFAIL)
return result;
usedgetauth = true;
/* no data available: don't try to authenticate */
if (result == EX_OK && mci->mci_sai[SASL_AUTHID] == NULL)
return result;
if (result != EX_OK)
{
if (SASLInfo == NULL)
return EX_UNAVAILABLE;
/* read authinfo from file */
result = readauth(SASLInfo, true, &(mci->mci_sai),
mci->mci_rpool);
if (result != EX_OK)
return result;
usedgetauth = false;
}
/* check whether sufficient data is available */
if (mci->mci_sai[SASL_PASSWORD] == NULL ||
*(mci->mci_sai)[SASL_PASSWORD] == '\0')
return EX_UNAVAILABLE;
if ((mci->mci_sai[SASL_AUTHID] == NULL ||
*(mci->mci_sai)[SASL_AUTHID] == '\0') &&
(mci->mci_sai[SASL_USER] == NULL ||
*(mci->mci_sai)[SASL_USER] == '\0'))
return EX_UNAVAILABLE;
/* set the context for the callback function to sai */
# if SASL >= 20000
callbacks[CB_PASS_IDX].context = (void *) mci;
# else /* SASL >= 20000 */
callbacks[CB_PASS_IDX].context = (void *) &mci->mci_sai;
# endif /* SASL >= 20000 */
callbacks[CB_USER_IDX].context = (void *) &mci->mci_sai;
callbacks[CB_AUTHNAME_IDX].context = (void *) &mci->mci_sai;
callbacks[CB_GETREALM_IDX].context = (void *) &mci->mci_sai;
#if 0
callbacks[CB_SAFESASL_IDX].context = (void *) &mci->mci_sai;
#endif /* 0 */
/* set default value for realm */
if ((mci->mci_sai)[SASL_DEFREALM] == NULL)
(mci->mci_sai)[SASL_DEFREALM] = sm_rpool_strdup_x(e->e_rpool,
macvalue('j', CurEnv));
/* set default value for list of mechanism to use */
if ((mci->mci_sai)[SASL_MECHLIST] == NULL ||
*(mci->mci_sai)[SASL_MECHLIST] == '\0')
(mci->mci_sai)[SASL_MECHLIST] = AuthMechanisms;
/* create list of mechanisms to try */
mci->mci_saslcap = intersect((mci->mci_sai)[SASL_MECHLIST],
mci->mci_saslcap, mci->mci_rpool);
/* initialize sasl client library */
result = init_sasl_client();
if (result != SASL_OK)
return usedgetauth ? EX_TEMPFAIL : EX_UNAVAILABLE;
do
{
result = attemptauth(m, mci, e, &(mci->mci_sai));
if (result == EX_OK)
mci->mci_sasl_auth = true;
else if (result == EX_TEMPFAIL || result == EX_NOPERM)
{
mci->mci_saslcap = removemech((mci->mci_sai)[SASL_MECH],
mci->mci_saslcap,
mci->mci_rpool);
if (mci->mci_saslcap == NULL ||
*(mci->mci_saslcap) == '\0')
return usedgetauth ? result
: EX_UNAVAILABLE;
}
else
return result;
} while (result != EX_OK);
return result;
}
#endif /* SASL */
/*
** SMTPMAILFROM -- send MAIL command
**
** Parameters:
** m -- the mailer.
** mci -- the mailer connection structure.
** e -- the envelope (including the sender to specify).
*/
int
smtpmailfrom(m, mci, e)
MAILER *m;
MCI *mci;
ENVELOPE *e;
{
int r;
char *bufp;
char *bodytype;
char *enhsc;
char buf[MAXNAME + 1];
char optbuf[MAXLINE];
if (tTd(18, 2))
sm_dprintf("smtpmailfrom: CurHost=%s\n", CurHostName);
enhsc = NULL;
/*
** Check if connection is gone, if so
** it's a tempfail and we use mci_errno
** for the reason.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
/* set up appropriate options to include */
if (bitset(MCIF_SIZE, mci->mci_flags) && e->e_msgsize > 0)
{
(void) sm_snprintf(optbuf, sizeof(optbuf), " SIZE=%ld",
e->e_msgsize);
bufp = &optbuf[strlen(optbuf)];
}
else
{
optbuf[0] = '\0';
bufp = optbuf;
}
bodytype = e->e_bodytype;
if (bitset(MCIF_8BITMIME, mci->mci_flags))
{
if (bodytype == NULL &&
bitset(MM_MIME8BIT, MimeMode) &&
bitset(EF_HAS8BIT, e->e_flags) &&
!bitset(EF_DONT_MIME, e->e_flags) &&
!bitnset(M_8BITS, m->m_flags))
bodytype = "8BITMIME";
if (bodytype != NULL &&
SPACELEFT(optbuf, bufp) > strlen(bodytype) + 7)
{
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" BODY=%s", bodytype);
bufp += strlen(bufp);
}
}
else if (bitnset(M_8BITS, m->m_flags) ||
!bitset(EF_HAS8BIT, e->e_flags) ||
bitset(MCIF_8BITOK, mci->mci_flags))
{
/* EMPTY */
/* just pass it through */
}
#if MIME8TO7
else if (bitset(MM_CVTMIME, MimeMode) &&
!bitset(EF_DONT_MIME, e->e_flags) &&
(!bitset(MM_PASS8BIT, MimeMode) ||
bitset(EF_IS_MIME, e->e_flags)))
{
/* must convert from 8bit MIME format to 7bit encoded */
mci->mci_flags |= MCIF_CVT8TO7;
}
#endif /* MIME8TO7 */
else if (!bitset(MM_PASS8BIT, MimeMode))
{
/* cannot just send a 8-bit version */
extern char MsgBuf[];
usrerrenh("5.6.3", "%s does not support 8BITMIME", CurHostName);
mci_setstat(mci, EX_NOTSTICKY, "5.6.3", MsgBuf);
return EX_DATAERR;
}
if (bitset(MCIF_DSN, mci->mci_flags))
{
if (e->e_envid != NULL &&
SPACELEFT(optbuf, bufp) > strlen(e->e_envid) + 7)
{
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" ENVID=%s", e->e_envid);
bufp += strlen(bufp);
}
/* RET= parameter */
if (bitset(EF_RET_PARAM, e->e_flags) &&
SPACELEFT(optbuf, bufp) > 9)
{
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" RET=%s",
bitset(EF_NO_BODY_RETN, e->e_flags) ?
"HDRS" : "FULL");
bufp += strlen(bufp);
}
}
if (bitset(MCIF_AUTH, mci->mci_flags) && e->e_auth_param != NULL &&
SPACELEFT(optbuf, bufp) > strlen(e->e_auth_param) + 7
#if SASL
&& (!bitset(SASL_AUTH_AUTH, SASLOpts) || mci->mci_sasl_auth)
#endif /* SASL */
)
{
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" AUTH=%s", e->e_auth_param);
bufp += strlen(bufp);
}
/*
** 17 is the max length required, we could use log() to compute
** the exact length (and check IS_DLVR_TRACE())
*/
if (bitset(MCIF_DLVR_BY, mci->mci_flags) &&
IS_DLVR_BY(e) && SPACELEFT(optbuf, bufp) > 17)
{
long dby;
/*
** Avoid problems with delays (for R) since the check
** in deliver() whether min-deliver-time is sufficient.
** Alternatively we could pass the computed time to this
** function.
*/
dby = e->e_deliver_by - (curtime() - e->e_ctime);
if (dby <= 0 && IS_DLVR_RETURN(e))
dby = mci->mci_min_by <= 0 ? 1 : mci->mci_min_by;
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" BY=%ld;%c%s",
dby,
IS_DLVR_RETURN(e) ? 'R' : 'N',
IS_DLVR_TRACE(e) ? "T" : "");
bufp += strlen(bufp);
}
/*
** Send the MAIL command.
** Designates the sender.
*/
mci->mci_state = MCIS_MAIL;
if (bitset(EF_RESPONSE, e->e_flags) &&
!bitnset(M_NO_NULL_FROM, m->m_flags))
buf[0] = '\0';
else
expand("\201g", buf, sizeof(buf), e);
if (buf[0] == '<')
{
/* strip off <angle brackets> (put back on below) */
bufp = &buf[strlen(buf) - 1];
if (*bufp == '>')
*bufp = '\0';
bufp = &buf[1];
}
else
bufp = buf;
if (bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) ||
!bitnset(M_FROMPATH, m->m_flags))
{
smtpmessage("MAIL From:<%s>%s", m, mci, bufp, optbuf);
}
else
{
smtpmessage("MAIL From:<@%s%c%s>%s", m, mci, MyHostName,
*bufp == '@' ? ',' : ':', bufp, optbuf);
}
SmtpPhase = mci->mci_phase = "client MAIL";
sm_setproctitle(true, e, "%s %s: %s", qid_printname(e),
CurHostName, mci->mci_phase);
r = reply(m, mci, e, TimeOuts.to_mail, NULL, &enhsc, XS_MAIL);
if (r < 0)
{
/* communications failure */
mci_setstat(mci, EX_TEMPFAIL, "4.4.2", NULL);
return EX_TEMPFAIL;
}
else if (r == SMTPCLOSING)
{
/* service shutting down: handled by reply() */
return EX_TEMPFAIL;
}
else if (REPLYTYPE(r) == 4)
{
mci_setstat(mci, EX_NOTSTICKY, ENHSCN(enhsc, smtptodsn(r)),
SmtpReplyBuffer);
return EX_TEMPFAIL;
}
else if (REPLYTYPE(r) == 2)
{
return EX_OK;
}
else if (r == 501)
{
/* syntax error in arguments */
mci_setstat(mci, EX_NOTSTICKY, ENHSCN(enhsc, "5.5.2"),
SmtpReplyBuffer);
return EX_DATAERR;
}
else if (r == 553)
{
/* mailbox name not allowed */
mci_setstat(mci, EX_NOTSTICKY, ENHSCN(enhsc, "5.1.3"),
SmtpReplyBuffer);
return EX_DATAERR;
}
else if (r == 552)
{
/* exceeded storage allocation */
mci_setstat(mci, EX_NOTSTICKY, ENHSCN(enhsc, "5.3.4"),
SmtpReplyBuffer);
if (bitset(MCIF_SIZE, mci->mci_flags))
e->e_flags |= EF_NO_BODY_RETN;
return EX_UNAVAILABLE;
}
else if (REPLYTYPE(r) == 5)
{
/* unknown error */
mci_setstat(mci, EX_NOTSTICKY, ENHSCN(enhsc, "5.0.0"),
SmtpReplyBuffer);
return EX_UNAVAILABLE;
}
if (LogLevel > 1)
{
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP MAIL protocol error: %s",
CurHostName,
shortenstring(SmtpReplyBuffer, 403));
}
/* protocol error -- close up */
mci_setstat(mci, EX_PROTOCOL, ENHSCN(enhsc, "5.5.1"),
SmtpReplyBuffer);
smtpquit(m, mci, e);
return EX_PROTOCOL;
}
/*
** SMTPRCPT -- designate recipient.
**
** Parameters:
** to -- address of recipient.
** m -- the mailer we are sending to.
** mci -- the connection info for this transaction.
** e -- the envelope for this transaction.
**
** Returns:
** exit status corresponding to recipient status.
**
** Side Effects:
** Sends the mail via SMTP.
*/
int
smtprcpt(to, m, mci, e, ctladdr, xstart)
ADDRESS *to;
register MAILER *m;
MCI *mci;
ENVELOPE *e;
ADDRESS *ctladdr;
time_t xstart;
{
char *bufp;
char optbuf[MAXLINE];
#if PIPELINING
/*
** If there is status waiting from the other end, read it.
** This should normally happen because of SMTP pipelining.
*/
while (mci->mci_nextaddr != NULL &&
sm_io_getinfo(mci->mci_in, SM_IO_IS_READABLE, NULL) > 0)
{
int r;
r = smtprcptstat(mci->mci_nextaddr, m, mci, e);
if (r != EX_OK)
{
markfailure(e, mci->mci_nextaddr, mci, r, false);
giveresponse(r, mci->mci_nextaddr->q_status, m, mci,
ctladdr, xstart, e, to);
}
mci->mci_nextaddr = mci->mci_nextaddr->q_pchain;
}
#endif /* PIPELINING */
/*
** Check if connection is gone, if so
** it's a tempfail and we use mci_errno
** for the reason.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
optbuf[0] = '\0';
bufp = optbuf;
/*
** Warning: in the following it is assumed that the free space
** in bufp is sizeof(optbuf)
*/
if (bitset(MCIF_DSN, mci->mci_flags))
{
if (IS_DLVR_NOTIFY(e) &&
!bitset(MCIF_DLVR_BY, mci->mci_flags))
{
/* RFC 2852: 4.1.4.2 */
if (!bitset(QHASNOTIFY, to->q_flags))
to->q_flags |= QPINGONFAILURE|QPINGONDELAY|QHASNOTIFY;
else if (bitset(QPINGONSUCCESS, to->q_flags) ||
bitset(QPINGONFAILURE, to->q_flags) ||
bitset(QPINGONDELAY, to->q_flags))
to->q_flags |= QPINGONDELAY;
}
/* NOTIFY= parameter */
if (bitset(QHASNOTIFY, to->q_flags) &&
bitset(QPRIMARY, to->q_flags) &&
!bitnset(M_LOCALMAILER, m->m_flags))
{
bool firstone = true;
(void) sm_strlcat(bufp, " NOTIFY=", sizeof(optbuf));
if (bitset(QPINGONSUCCESS, to->q_flags))
{
(void) sm_strlcat(bufp, "SUCCESS", sizeof(optbuf));
firstone = false;
}
if (bitset(QPINGONFAILURE, to->q_flags))
{
if (!firstone)
(void) sm_strlcat(bufp, ",",
sizeof(optbuf));
(void) sm_strlcat(bufp, "FAILURE", sizeof(optbuf));
firstone = false;
}
if (bitset(QPINGONDELAY, to->q_flags))
{
if (!firstone)
(void) sm_strlcat(bufp, ",",
sizeof(optbuf));
(void) sm_strlcat(bufp, "DELAY", sizeof(optbuf));
firstone = false;
}
if (firstone)
(void) sm_strlcat(bufp, "NEVER", sizeof(optbuf));
bufp += strlen(bufp);
}
/* ORCPT= parameter */
if (to->q_orcpt != NULL &&
SPACELEFT(optbuf, bufp) > strlen(to->q_orcpt) + 7)
{
(void) sm_snprintf(bufp, SPACELEFT(optbuf, bufp),
" ORCPT=%s", to->q_orcpt);
bufp += strlen(bufp);
}
}
smtpmessage("RCPT To:<%s>%s", m, mci, to->q_user, optbuf);
mci->mci_state = MCIS_RCPT;
SmtpPhase = mci->mci_phase = "client RCPT";
sm_setproctitle(true, e, "%s %s: %s", qid_printname(e),
CurHostName, mci->mci_phase);
#if PIPELINING
/*
** If running SMTP pipelining, we will pick up status later
*/
if (bitset(MCIF_PIPELINED, mci->mci_flags))
return EX_OK;
#endif /* PIPELINING */
return smtprcptstat(to, m, mci, e);
}
/*
** SMTPRCPTSTAT -- get recipient status
**
** This is only called during SMTP pipelining
**
** Parameters:
** to -- address of recipient.
** m -- mailer being sent to.
** mci -- the mailer connection information.
** e -- the envelope for this message.
**
** Returns:
** EX_* -- protocol status
*/
static int
smtprcptstat(to, m, mci, e)
ADDRESS *to;
MAILER *m;
register MCI *mci;
register ENVELOPE *e;
{
int r;
int save_errno;
char *enhsc;
/*
** Check if connection is gone, if so
** it's a tempfail and we use mci_errno
** for the reason.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
enhsc = NULL;
r = reply(m, mci, e, TimeOuts.to_rcpt, NULL, &enhsc, XS_RCPT);
save_errno = errno;
to->q_rstatus = sm_rpool_strdup_x(e->e_rpool, SmtpReplyBuffer);
to->q_status = ENHSCN_RPOOL(enhsc, smtptodsn(r), e->e_rpool);
if (!bitnset(M_LMTP, m->m_flags))
to->q_statmta = mci->mci_host;
if (r < 0 || REPLYTYPE(r) == 4)
{
mci->mci_retryrcpt = true;
errno = save_errno;
return EX_TEMPFAIL;
}
else if (REPLYTYPE(r) == 2)
{
char *t;
if ((t = mci->mci_tolist) != NULL)
{
char *p;
*t++ = ',';
for (p = to->q_paddr; *p != '\0'; *t++ = *p++)
continue;
*t = '\0';
mci->mci_tolist = t;
}
#if PIPELINING
mci->mci_okrcpts++;
#endif /* PIPELINING */
return EX_OK;
}
else if (r == 550)
{
to->q_status = ENHSCN_RPOOL(enhsc, "5.1.1", e->e_rpool);
return EX_NOUSER;
}
else if (r == 551)
{
to->q_status = ENHSCN_RPOOL(enhsc, "5.1.6", e->e_rpool);
return EX_NOUSER;
}
else if (r == 553)
{
to->q_status = ENHSCN_RPOOL(enhsc, "5.1.3", e->e_rpool);
return EX_NOUSER;
}
else if (REPLYTYPE(r) == 5)
{
return EX_UNAVAILABLE;
}
if (LogLevel > 1)
{
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP RCPT protocol error: %s",
CurHostName,
shortenstring(SmtpReplyBuffer, 403));
}
mci_setstat(mci, EX_PROTOCOL, ENHSCN(enhsc, "5.5.1"),
SmtpReplyBuffer);
return EX_PROTOCOL;
}
/*
** SMTPDATA -- send the data and clean up the transaction.
**
** Parameters:
** m -- mailer being sent to.
** mci -- the mailer connection information.
** e -- the envelope for this message.
**
** Returns:
** exit status corresponding to DATA command.
*/
int
smtpdata(m, mci, e, ctladdr, xstart)
MAILER *m;
register MCI *mci;
register ENVELOPE *e;
ADDRESS *ctladdr;
time_t xstart;
{
register int r;
int rstat;
int xstat;
int timeout;
char *enhsc;
/*
** Check if connection is gone, if so
** it's a tempfail and we use mci_errno
** for the reason.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
enhsc = NULL;
/*
** Send the data.
** First send the command and check that it is ok.
** Then send the data (if there are valid recipients).
** Follow it up with a dot to terminate.
** Finally get the results of the transaction.
*/
/* send the command and check ok to proceed */
smtpmessage("DATA", m, mci);
#if PIPELINING
if (mci->mci_nextaddr != NULL)
{
char *oldto = e->e_to;
/* pick up any pending RCPT responses for SMTP pipelining */
while (mci->mci_nextaddr != NULL)
{
int r;
e->e_to = mci->mci_nextaddr->q_paddr;
r = smtprcptstat(mci->mci_nextaddr, m, mci, e);
if (r != EX_OK)
{
markfailure(e, mci->mci_nextaddr, mci, r,
false);
giveresponse(r, mci->mci_nextaddr->q_status, m,
mci, ctladdr, xstart, e,
mci->mci_nextaddr);
if (r == EX_TEMPFAIL)
mci->mci_nextaddr->q_state = QS_RETRY;
}
mci->mci_nextaddr = mci->mci_nextaddr->q_pchain;
}
e->e_to = oldto;
/*
** Connection might be closed in response to a RCPT command,
** i.e., the server responded with 421. In that case (at
** least) one RCPT has a temporary failure, hence we don't
** need to check mci_okrcpts (as it is done below) to figure
** out which error to return.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
}
#endif /* PIPELINING */
/* now proceed with DATA phase */
SmtpPhase = mci->mci_phase = "client DATA 354";
mci->mci_state = MCIS_DATA;
sm_setproctitle(true, e, "%s %s: %s",
qid_printname(e), CurHostName, mci->mci_phase);
r = reply(m, mci, e, TimeOuts.to_datainit, NULL, &enhsc, XS_DATA);
if (r < 0 || REPLYTYPE(r) == 4)
{
if (r >= 0)
smtpquit(m, mci, e);
errno = mci->mci_errno;
return EX_TEMPFAIL;
}
else if (REPLYTYPE(r) == 5)
{
smtprset(m, mci, e);
#if PIPELINING
if (mci->mci_okrcpts <= 0)
return mci->mci_retryrcpt ? EX_TEMPFAIL
: EX_UNAVAILABLE;
#endif /* PIPELINING */
return EX_UNAVAILABLE;
}
else if (REPLYTYPE(r) != 3)
{
if (LogLevel > 1)
{
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP DATA-1 protocol error: %s",
CurHostName,
shortenstring(SmtpReplyBuffer, 403));
}
smtprset(m, mci, e);
mci_setstat(mci, EX_PROTOCOL, ENHSCN(enhsc, "5.5.1"),
SmtpReplyBuffer);
#if PIPELINING
if (mci->mci_okrcpts <= 0)
return mci->mci_retryrcpt ? EX_TEMPFAIL
: EX_PROTOCOL;
#endif /* PIPELINING */
return EX_PROTOCOL;
}
#if PIPELINING
if (mci->mci_okrcpts > 0)
{
#endif /* PIPELINING */
/*
** Set timeout around data writes. Make it at least large
** enough for DNS timeouts on all recipients plus some fudge
** factor. The main thing is that it should not be infinite.
*/
if (tTd(18, 101))
{
/* simulate a DATA timeout */
timeout = 10;
}
else
timeout = DATA_PROGRESS_TIMEOUT * 1000;
sm_io_setinfo(mci->mci_out, SM_IO_WHAT_TIMEOUT, &timeout);
/*
** Output the actual message.
*/
if (!(*e->e_puthdr)(mci, e->e_header, e, M87F_OUTER))
goto writeerr;
if (tTd(18, 101))
{
/* simulate a DATA timeout */
(void) sleep(2);
}
if (!(*e->e_putbody)(mci, e, NULL))
goto writeerr;
/*
** Cleanup after sending message.
*/
#if PIPELINING
}
#endif /* PIPELINING */
#if _FFR_CATCH_BROKEN_MTAS
if (sm_io_getinfo(mci->mci_in, SM_IO_IS_READABLE, NULL) > 0)
{
/* terminate the message */
(void) sm_io_fprintf(mci->mci_out, SM_TIME_DEFAULT, ".%s",
m->m_eol);
if (TrafficLogFile != NULL)
(void) sm_io_fprintf(TrafficLogFile, SM_TIME_DEFAULT,
"%05d >>> .\n", (int) CurrentPid);
if (Verbose)
nmessage(">>> .");
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP DATA-1 protocol error: remote server returned response before final dot",
CurHostName);
mci->mci_errno = EIO;
mci->mci_state = MCIS_ERROR;
mci_setstat(mci, EX_PROTOCOL, "5.5.0", NULL);
smtpquit(m, mci, e);
return EX_PROTOCOL;
}
#endif /* _FFR_CATCH_BROKEN_MTAS */
if (sm_io_error(mci->mci_out))
{
/* error during processing -- don't send the dot */
mci->mci_errno = EIO;
mci->mci_state = MCIS_ERROR;
mci_setstat(mci, EX_IOERR, "4.4.2", NULL);
smtpquit(m, mci, e);
return EX_IOERR;
}
/* terminate the message */
if (sm_io_fprintf(mci->mci_out, SM_TIME_DEFAULT, "%s.%s",
bitset(MCIF_INLONGLINE, mci->mci_flags) ? m->m_eol : "",
m->m_eol) == SM_IO_EOF)
goto writeerr;
if (TrafficLogFile != NULL)
(void) sm_io_fprintf(TrafficLogFile, SM_TIME_DEFAULT,
"%05d >>> .\n", (int) CurrentPid);
if (Verbose)
nmessage(">>> .");
/* check for the results of the transaction */
SmtpPhase = mci->mci_phase = "client DATA status";
sm_setproctitle(true, e, "%s %s: %s", qid_printname(e),
CurHostName, mci->mci_phase);
if (bitnset(M_LMTP, m->m_flags))
return EX_OK;
r = reply(m, mci, e, TimeOuts.to_datafinal, NULL, &enhsc, XS_EOM);
if (r < 0)
return EX_TEMPFAIL;
if (mci->mci_state == MCIS_DATA)
mci->mci_state = MCIS_OPEN;
xstat = EX_NOTSTICKY;
if (r == 452)
rstat = EX_TEMPFAIL;
else if (REPLYTYPE(r) == 4)
rstat = xstat = EX_TEMPFAIL;
else if (REPLYTYPE(r) == 2)
rstat = xstat = EX_OK;
else if (REPLYCLASS(r) != 5)
rstat = xstat = EX_PROTOCOL;
else if (REPLYTYPE(r) == 5)
rstat = EX_UNAVAILABLE;
else
rstat = EX_PROTOCOL;
mci_setstat(mci, xstat, ENHSCN(enhsc, smtptodsn(r)),
SmtpReplyBuffer);
if (bitset(MCIF_ENHSTAT, mci->mci_flags) &&
(r = isenhsc(SmtpReplyBuffer + 4, ' ')) > 0)
r += 5;
else
r = 4;
e->e_statmsg = sm_rpool_strdup_x(e->e_rpool, &SmtpReplyBuffer[r]);
SmtpPhase = mci->mci_phase = "idle";
sm_setproctitle(true, e, "%s: %s", CurHostName, mci->mci_phase);
if (rstat != EX_PROTOCOL)
return rstat;
if (LogLevel > 1)
{
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP DATA-2 protocol error: %s",
CurHostName,
shortenstring(SmtpReplyBuffer, 403));
}
return rstat;
writeerr:
mci->mci_errno = errno;
mci->mci_state = MCIS_ERROR;
mci_setstat(mci, EX_TEMPFAIL, "4.4.2", NULL);
/*
** If putbody() couldn't finish due to a timeout,
** rewind it here in the timeout handler. See
** comments at the end of putbody() for reasoning.
*/
if (e->e_dfp != NULL)
(void) bfrewind(e->e_dfp);
errno = mci->mci_errno;
syserr("451 4.4.1 timeout writing message to %s", CurHostName);
smtpquit(m, mci, e);
return EX_TEMPFAIL;
}
/*
** SMTPGETSTAT -- get status code from DATA in LMTP
**
** Parameters:
** m -- the mailer to which we are sending the message.
** mci -- the mailer connection structure.
** e -- the current envelope.
**
** Returns:
** The exit status corresponding to the reply code.
*/
int
smtpgetstat(m, mci, e)
MAILER *m;
MCI *mci;
ENVELOPE *e;
{
int r;
int off;
int status, xstat;
char *enhsc;
enhsc = NULL;
/* check for the results of the transaction */
r = reply(m, mci, e, TimeOuts.to_datafinal, NULL, &enhsc, XS_DATA2);
if (r < 0)
return EX_TEMPFAIL;
xstat = EX_NOTSTICKY;
if (REPLYTYPE(r) == 4)
status = EX_TEMPFAIL;
else if (REPLYTYPE(r) == 2)
status = xstat = EX_OK;
else if (REPLYCLASS(r) != 5)
status = xstat = EX_PROTOCOL;
else if (REPLYTYPE(r) == 5)
status = EX_UNAVAILABLE;
else
status = EX_PROTOCOL;
if (bitset(MCIF_ENHSTAT, mci->mci_flags) &&
(off = isenhsc(SmtpReplyBuffer + 4, ' ')) > 0)
off += 5;
else
off = 4;
e->e_statmsg = sm_rpool_strdup_x(e->e_rpool, &SmtpReplyBuffer[off]);
mci_setstat(mci, xstat, ENHSCN(enhsc, smtptodsn(r)), SmtpReplyBuffer);
if (LogLevel > 1 && status == EX_PROTOCOL)
{
sm_syslog(LOG_CRIT, e->e_id,
"%.100s: SMTP DATA-3 protocol error: %s",
CurHostName,
shortenstring(SmtpReplyBuffer, 403));
}
return status;
}
/*
** SMTPQUIT -- close the SMTP connection.
**
** Parameters:
** m -- a pointer to the mailer.
** mci -- the mailer connection information.
** e -- the current envelope.
**
** Returns:
** none.
**
** Side Effects:
** sends the final protocol and closes the connection.
*/
void
smtpquit(m, mci, e)
register MAILER *m;
register MCI *mci;
ENVELOPE *e;
{
bool oldSuprErrs = SuprErrs;
int rcode;
char *oldcurhost;
if (mci->mci_state == MCIS_CLOSED)
{
mci_close(mci, "smtpquit:1");
return;
}
oldcurhost = CurHostName;
CurHostName = mci->mci_host; /* XXX UGLY XXX */
if (CurHostName == NULL)
CurHostName = MyHostName;
#if PIPELINING
mci->mci_okrcpts = 0;
#endif /* PIPELINING */
/*
** Suppress errors here -- we may be processing a different
** job when we do the quit connection, and we don't want the
** new job to be penalized for something that isn't it's
** problem.
*/
SuprErrs = true;
/* send the quit message if we haven't gotten I/O error */
if (mci->mci_state != MCIS_ERROR &&
mci->mci_state != MCIS_QUITING)
{
SmtpPhase = "client QUIT";
mci->mci_state = MCIS_QUITING;
smtpmessage("QUIT", m, mci);
(void) reply(m, mci, e, TimeOuts.to_quit, NULL, NULL, XS_QUIT);
SuprErrs = oldSuprErrs;
if (mci->mci_state == MCIS_CLOSED)
goto end;
}
/* now actually close the connection and pick up the zombie */
rcode = endmailer(mci, e, NULL);
if (rcode != EX_OK)
{
char *mailer = NULL;
if (mci->mci_mailer != NULL &&
mci->mci_mailer->m_name != NULL)
mailer = mci->mci_mailer->m_name;
/* look for naughty mailers */
sm_syslog(LOG_ERR, e->e_id,
"smtpquit: mailer%s%s exited with exit value %d",
mailer == NULL ? "" : " ",
mailer == NULL ? "" : mailer,
rcode);
}
SuprErrs = oldSuprErrs;
end:
CurHostName = oldcurhost;
return;
}
/*
** SMTPRSET -- send a RSET (reset) command
**
** Parameters:
** m -- a pointer to the mailer.
** mci -- the mailer connection information.
** e -- the current envelope.
**
** Returns:
** none.
**
** Side Effects:
** closes the connection if there is no reply to RSET.
*/
void
smtprset(m, mci, e)
register MAILER *m;
register MCI *mci;
ENVELOPE *e;
{
int r;
CurHostName = mci->mci_host; /* XXX UGLY XXX */
if (CurHostName == NULL)
CurHostName = MyHostName;
#if PIPELINING
mci->mci_okrcpts = 0;
#endif /* PIPELINING */
/*
** Check if connection is gone, if so
** it's a tempfail and we use mci_errno
** for the reason.
*/
if (mci->mci_state == MCIS_CLOSED)
{
errno = mci->mci_errno;
return;
}
SmtpPhase = "client RSET";
smtpmessage("RSET", m, mci);
r = reply(m, mci, e, TimeOuts.to_rset, NULL, NULL, XS_DEFAULT);
if (r < 0)
return;
/*
** Any response is deemed to be acceptable.
** The standard does not state the proper action
** to take when a value other than 250 is received.
**
** However, if 421 is returned for the RSET, leave
** mci_state alone (MCIS_SSD can be set in reply()
** and MCIS_CLOSED can be set in smtpquit() if
** reply() gets a 421 and calls smtpquit()).
*/
if (mci->mci_state != MCIS_SSD && mci->mci_state != MCIS_CLOSED)
mci->mci_state = MCIS_OPEN;
else if (mci->mci_exitstat == EX_OK)
mci_setstat(mci, EX_TEMPFAIL, "4.5.0", NULL);
}
/*
** SMTPPROBE -- check the connection state
**
** Parameters:
** mci -- the mailer connection information.
**
** Returns:
** none.
**
** Side Effects:
** closes the connection if there is no reply to RSET.
*/
int
smtpprobe(mci)
register MCI *mci;
{
int r;
MAILER *m = mci->mci_mailer;
ENVELOPE *e;
extern ENVELOPE BlankEnvelope;
CurHostName = mci->mci_host; /* XXX UGLY XXX */
if (CurHostName == NULL)
CurHostName = MyHostName;
e = &BlankEnvelope;
SmtpPhase = "client probe";
smtpmessage("RSET", m, mci);
r = reply(m, mci, e, TimeOuts.to_miscshort, NULL, NULL, XS_DEFAULT);
if (REPLYTYPE(r) != 2)
smtpquit(m, mci, e);
return r;
}
/*
** REPLY -- read arpanet reply
**
** Parameters:
** m -- the mailer we are reading the reply from.
** mci -- the mailer connection info structure.
** e -- the current envelope.
** timeout -- the timeout for reads.
** pfunc -- processing function called on each line of response.
** If null, no special processing is done.
** enhstat -- optional, returns enhanced error code string (if set)
** rtype -- type of SmtpMsgBuffer: does it contains secret data?
**
** Returns:
** reply code it reads.
**
** Side Effects:
** flushes the mail file.
*/
int
reply(m, mci, e, timeout, pfunc, enhstat, rtype)
MAILER *m;
MCI *mci;
ENVELOPE *e;
time_t timeout;
void (*pfunc) __P((char *, bool, MAILER *, MCI *, ENVELOPE *));
char **enhstat;
int rtype;
{
register char *bufp;
register int r;
bool firstline = true;
char junkbuf[MAXLINE];
static char enhstatcode[ENHSCLEN];
int save_errno;
/*
** Flush the output before reading response.
**
** For SMTP pipelining, it would be better if we didn't do
** this if there was already data waiting to be read. But
** to do it properly means pushing it to the I/O library,
** since it really needs to be done below the buffer layer.
*/
if (mci->mci_out != NULL)
(void) sm_io_flush(mci->mci_out, SM_TIME_DEFAULT);
if (tTd(18, 1))
sm_dprintf("reply\n");
/*
** Read the input line, being careful not to hang.
*/
bufp = SmtpReplyBuffer;
set_tls_rd_tmo(timeout);
for (;;)
{
register char *p;
/* actually do the read */
if (e->e_xfp != NULL) /* for debugging */
(void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
/* if we are in the process of closing just give the code */
if (mci->mci_state == MCIS_CLOSED)
return SMTPCLOSING;
/* don't try to read from a non-existent fd */
if (mci->mci_in == NULL)
{
if (mci->mci_errno == 0)
mci->mci_errno = EBADF;
/* errors on QUIT should be ignored */
if (strncmp(SmtpMsgBuffer, "QUIT", 4) == 0)
{
errno = mci->mci_errno;
mci_close(mci, "reply:1");
return -1;
}
mci->mci_state = MCIS_ERROR;
smtpquit(m, mci, e);
errno = mci->mci_errno;
return -1;
}
if (mci->mci_out != NULL)
(void) sm_io_flush(mci->mci_out, SM_TIME_DEFAULT);
/* get the line from the other side */
p = sfgets(bufp, MAXLINE, mci->mci_in, timeout, SmtpPhase);
save_errno = errno;
mci->mci_lastuse = curtime();
if (p == NULL)
{
bool oldholderrs;
extern char MsgBuf[];
/* errors on QUIT should be ignored */
if (strncmp(SmtpMsgBuffer, "QUIT", 4) == 0)
{
mci_close(mci, "reply:2");
return -1;
}
/* if the remote end closed early, fake an error */
errno = save_errno;
if (errno == 0)
{
(void) sm_snprintf(SmtpReplyBuffer,
sizeof(SmtpReplyBuffer),
"421 4.4.1 Connection reset by %s",
CURHOSTNAME);
#ifdef ECONNRESET
errno = ECONNRESET;
#else /* ECONNRESET */
errno = EPIPE;
#endif /* ECONNRESET */
}
mci->mci_errno = errno;
oldholderrs = HoldErrs;
HoldErrs = true;
usrerr("451 4.4.1 reply: read error from %s",
CURHOSTNAME);
mci_setstat(mci, EX_TEMPFAIL, "4.4.2", MsgBuf);
/* if debugging, pause so we can see state */
if (tTd(18, 100))
(void) pause();
mci->mci_state = MCIS_ERROR;
smtpquit(m, mci, e);
#if XDEBUG
{
char wbuf[MAXLINE];
p = wbuf;
if (e->e_to != NULL)
{
(void) sm_snprintf(p,
SPACELEFT(wbuf, p),
"%s... ",
shortenstring(e->e_to, MAXSHORTSTR));
p += strlen(p);
}
(void) sm_snprintf(p, SPACELEFT(wbuf, p),
"reply(%.100s) during %s",
CURHOSTNAME, SmtpPhase);
checkfd012(wbuf);
}
#endif /* XDEBUG */
HoldErrs = oldholderrs;
errno = save_errno;
return -1;
}
fixcrlf(bufp, true);
/* EHLO failure is not a real error */
if (e->e_xfp != NULL && (bufp[0] == '4' ||
(bufp[0] == '5' && strncmp(SmtpMsgBuffer, "EHLO", 4) != 0)))
{
/* serious error -- log the previous command */
if (SmtpNeedIntro)
{
/* inform user who we are chatting with */
(void) sm_io_fprintf(CurEnv->e_xfp,
SM_TIME_DEFAULT,
"... while talking to %s:\n",
CURHOSTNAME);
SmtpNeedIntro = false;
}
if (SmtpMsgBuffer[0] != '\0')
{
(void) sm_io_fprintf(e->e_xfp,
SM_TIME_DEFAULT,
">>> %s\n",
(rtype == XS_STARTTLS)
? "STARTTLS dialogue"
: ((rtype == XS_AUTH)
? "AUTH dialogue"
: SmtpMsgBuffer));
SmtpMsgBuffer[0] = '\0';
}
/* now log the message as from the other side */
(void) sm_io_fprintf(e->e_xfp, SM_TIME_DEFAULT,
"<<< %s\n", bufp);
}
/* display the input for verbose mode */
if (Verbose)
nmessage("050 %s", bufp);
/* ignore improperly formatted input */
if (!ISSMTPREPLY(bufp))
continue;
if (bitset(MCIF_ENHSTAT, mci->mci_flags) &&
enhstat != NULL &&
extenhsc(bufp + 4, ' ', enhstatcode) > 0)
*enhstat = enhstatcode;
/* process the line */
if (pfunc != NULL)
(*pfunc)(bufp, firstline, m, mci, e);
/* decode the reply code */
r = atoi(bufp);
/* extra semantics: 0xx codes are "informational" */
if (r < 100)
{
firstline = false;
continue;
}
firstline = false;
/* if no continuation lines, return this line */
if (bufp[3] != '-')
break;
/* first line of real reply -- ignore rest */
bufp = junkbuf;
}
/*
** Now look at SmtpReplyBuffer -- only care about the first
** line of the response from here on out.
*/
/* save temporary failure messages for posterity */
if (SmtpReplyBuffer[0] == '4')
(void) sm_strlcpy(SmtpError, SmtpReplyBuffer, sizeof(SmtpError));
/* reply code 421 is "Service Shutting Down" */
if (r == SMTPCLOSING && mci->mci_state != MCIS_SSD &&
mci->mci_state != MCIS_QUITING)
{
/* send the quit protocol */
mci->mci_state = MCIS_SSD;
smtpquit(m, mci, e);
}
return r;
}
/*
** SMTPMESSAGE -- send message to server
**
** Parameters:
** f -- format
** m -- the mailer to control formatting.
** a, b, c -- parameters
**
** Returns:
** none.
**
** Side Effects:
** writes message to mci->mci_out.
*/
/*VARARGS1*/
void
#ifdef __STDC__
smtpmessage(char *f, MAILER *m, MCI *mci, ...)
#else /* __STDC__ */
smtpmessage(f, m, mci, va_alist)
char *f;
MAILER *m;
MCI *mci;
va_dcl
#endif /* __STDC__ */
{
SM_VA_LOCAL_DECL
SM_VA_START(ap, mci);
(void) sm_vsnprintf(SmtpMsgBuffer, sizeof(SmtpMsgBuffer), f, ap);
SM_VA_END(ap);
if (tTd(18, 1) || Verbose)
nmessage(">>> %s", SmtpMsgBuffer);
if (TrafficLogFile != NULL)
(void) sm_io_fprintf(TrafficLogFile, SM_TIME_DEFAULT,
"%05d >>> %s\n", (int) CurrentPid,
SmtpMsgBuffer);
if (mci->mci_out != NULL)
{
(void) sm_io_fprintf(mci->mci_out, SM_TIME_DEFAULT, "%s%s",
SmtpMsgBuffer, m == NULL ? "\r\n"
: m->m_eol);
}
else if (tTd(18, 1))
{
sm_dprintf("smtpmessage: NULL mci_out\n");
}
}