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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "safe-memset.h"
#include "mech.h"
#include "passdb.h"
#include "mech-plain-common.h"
static void
mech_plain_auth_continue(struct auth_request *request,
const unsigned char *data, size_t data_size)
{
const char *authid, *authenid, *error;
char *pass;
size_t i, len;
int count;
/* authorization ID \0 authentication ID \0 pass. */
authid = (const char *) data;
authenid = NULL; pass = NULL;
count = 0;
for (i = 0; i < data_size; i++) {
if (data[i] == '\0') {
if (++count == 1)
authenid = (const char *) data + i+1;
else if (count == 2) {
i++;
len = data_size - i;
pass = p_strndup(unsafe_data_stack_pool,
data+i, len);
}
else
break;
}
}
if (count == 2 && authenid != NULL && strcmp(authid, authenid) == 0) {
/* the login username isn't different */
authid = "";
}
if (count != 2) {
/* invalid input */
e_info(request->mech_event, "invalid input");
auth_request_fail(request);
} else if (!auth_request_set_username(request, authenid, &error)) {
/* invalid username */
e_info(request->mech_event, "%s", error);
auth_request_fail(request);
} else if (*authid != '\0' &&
!auth_request_set_login_username(request, authid, &error)) {
/* invalid login username */
e_info(request->mech_event,
"login user: %s", error);
auth_request_fail(request);
} else {
auth_request_verify_plain(request, pass,
plain_verify_callback);
}
/* make sure it's cleared */
if (pass != NULL)
safe_memset(pass, 0, strlen(pass));
}
static struct auth_request *mech_plain_auth_new(void)
{
struct auth_request *request;
pool_t pool;
pool = pool_alloconly_create(MEMPOOL_GROWING"plain_auth_request", 2048);
request = p_new(pool, struct auth_request, 1);
request->pool = pool;
return request;
}
const struct mech_module mech_plain = {
"PLAIN",
.flags = MECH_SEC_PLAINTEXT | MECH_SEC_ALLOW_NULS,
.passdb_need = MECH_PASSDB_NEED_VERIFY_PLAIN,
mech_plain_auth_new,
mech_generic_auth_initial,
mech_plain_auth_continue,
mech_generic_auth_free
};
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