public/ejabberd-auth
public/ejabberd-auth
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smtp checkuser function has been done;

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This commit is contained in:
Alexander Vdolainen 2021-04-05 23:34:02 +03:00
parent 9b59b50b44
commit 64c15a9b0e
2 changed files with 84 additions and 1 deletions
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28
include/smtpf.h Normal file
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@ -0,0 +1,28 @@
/*
* ejabberd external authentication program
*
* (c) Alexander Vdolainen 2013, 2018, 2019, 2021 <alex@vapaa.xyz>
*
* this 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 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, see <http://www.gnu.org/licenses/>.";
*
*/
#ifndef __SMTPF_H__
#define __SMTPF_H__
#define SMTPLINE_LENGTH 320
int smtp_checkuser(struct tlsport *p, struct ejabber_msg *m, const char *host);
#endif /* __SMTPF_H__ */

57
src/smtp.c
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@ -34,8 +34,63 @@
#include <eport.h> #include <eport.h>
#include <tlsport.h> #include <tlsport.h>
#include <smtpf.h>
int smtp_checkuser(struct tlsport *p, struct ejabber_msg *m, const char *host) int smtp_checkuser(struct tlsport *p, struct ejabber_msg *m, const char *host)
{ {
return -1; char buf[SMTPLINE_LENGTH];
int len, mlen, r;
/* sanity check */
if(!m || !m->user) return -1;
if(!m->domain || !m->password) return -1;
if(!p || !p->ssl) return -1;
if(!host) return -1;
/* clear stack buffers */
len = mlen = r = 0;
memset(buf, 0, SMTPLINE_LENGTH);
/* start with hello */
mlen = strlen(host) + sizeof(char)*5;
if(mlen > SMTPLINE_LENGTH - sizeof(char)) return -1; /* too long message */
snprintf(buf, mlen + sizeof(char), "HELO %s", host);
len = tls_io(p, buf, mlen, TLSIO_WRITE);
if(len < 0) return -1;
else memset(buf, 0, mlen);
/* check the reply if any */
len = tls_io(p, buf, SMTPLINE_LENGTH - sizeof(char), TLSIO_READ);
if(len < 4) return -1;
else if(strncmp(buf, "250 ", 4)) return -1;
/* set mail from */
mlen = strlen(m->user) + strlen(m->domain) + 15*sizeof(char);
if(mlen > SMTPLINE_LENGTH - sizeof(char)) return -1; /* too long message */
snprintf(buf, mlen + sizeof(char), "mail from:<%s@%s>", m->user, m->domain);
len = tls_io(p, buf, mlen, TLSIO_WRITE);
if(len < 0) return -1;
else memset(buf, 0, mlen);
/* check the reply if any */
len = tls_io(p, buf, SMTPLINE_LENGTH - sizeof(char), TLSIO_READ);
if(len < 4) return -1;
else if(strncmp(buf, "250 ", 4)) return -1;
/* set recepient, if it's ok - user exists, if it's not - no such user */
mlen = strlen(m->user) + strlen(m->domain) + 11*sizeof(char);
if(mlen > SMTPLINE_LENGTH - sizeof(char)) return -1; /* too long message */
snprintf(buf, mlen + sizeof(char), "rcpt to:<%s@%s>", m->user, m->domain);
len = tls_io(p, buf, mlen, TLSIO_WRITE);
if(len < 0) return -1;
else memset(buf, 0, mlen);
/* check the reply if any */
len = tls_io(p, buf, SMTPLINE_LENGTH - sizeof(char), TLSIO_READ);
if(len < 4) return -1;
else if(strncmp(buf, "250 ", 4)) r = -1;
/* gracefully end smtp session */
mlen = strlen("quit");
snprintf(buf, mlen + sizeof(char), "quit");
tls_io(p, buf, mlen, TLSIO_WRITE);
return r;
} }