pop3_apop.c
2.69 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2001, 2003, 2005, 2007, 2010-2012, 2014 Free
Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <mailutils/sys/pop3.h>
#include <mailutils/md5.h>
/*
* APOP name digest
* a string identifying a mailbox and a MD5 digest string (both required)
*/
int
mu_pop3_apop (mu_pop3_t pop3, const char *user, const char *secret)
{
int status;
/* Sanity checks. */
if (pop3 == NULL || user == NULL || secret == NULL)
return EINVAL;
/* The server did not offer a timestamp in the greeting, bailout early. */
if (pop3->timestamp == NULL)
return ENOTSUP;
switch (pop3->state)
{
/* Generate the md5 from the secret and timestamp. */
case MU_POP3_NO_STATE:
{
struct mu_md5_ctx md5context;
unsigned char md5digest[16];
char digest[64]; /* Really it just has to be 32 + 1(null). */
char *tmp;
size_t n;
mu_md5_init_ctx (&md5context);
mu_md5_process_bytes (pop3->timestamp, strlen (pop3->timestamp),
&md5context);
mu_md5_process_bytes (secret, strlen (secret), &md5context);
mu_md5_finish_ctx (&md5context, md5digest);
for (tmp = digest, n = 0; n < 16; n++, tmp += 2)
sprintf (tmp, "%02x", md5digest[n]);
*tmp = '\0';
status = mu_pop3_writeline (pop3, "APOP %s %s\r\n", user, digest);
/* Obscure the digest, for security reasons. */
memset (digest, '\0', sizeof digest);
MU_POP3_CHECK_ERROR (pop3, status);
MU_POP3_FCLR (pop3, MU_POP3_ACK);
pop3->state = MU_POP3_APOP;
}
case MU_POP3_APOP:
status = mu_pop3_response (pop3, NULL);
MU_POP3_CHECK_EAGAIN (pop3, status);
MU_POP3_CHECK_OK (pop3);
pop3->state = MU_POP3_NO_STATE;
break;
/* They must deal with the error first by reopening. */
case MU_POP3_ERROR:
status = ECANCELED;
break;
/* No case in the switch another operation was in progress. */
default:
status = EINPROGRESS;
}
return status;
}