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/*
Authors:
Sumit Bose <sbose@redhat.com>
PAM client - create message blob
Copyright (C) 2015 Red Hat
This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <security/pam_modules.h>
#include "sss_pam_compat.h"
#include "sss_pam_macros.h"
#include "pam_message.h"
#include "sss_cli.h"
static size_t add_authtok_item(enum pam_item_type type,
enum sss_authtok_type authtok_type,
const char *tok, const size_t size,
uint8_t *buf)
{
size_t rp = 0;
uint32_t c;
if (tok == NULL) return 0;
c = type;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
c = size + sizeof(uint32_t);
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
c = authtok_type;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
memcpy(&buf[rp], tok, size);
rp += size;
return rp;
}
static size_t add_uint32_t_item(enum pam_item_type type, const uint32_t val,
uint8_t *buf)
{
size_t rp = 0;
uint32_t c;
c = type;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
c = sizeof(uint32_t);
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
c = val;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
return rp;
}
static size_t add_string_item(enum pam_item_type type, const char *str,
const size_t size, uint8_t *buf)
{
size_t rp = 0;
uint32_t c;
if (str == NULL || *str == '\0') return 0;
c = type;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
c = size;
memcpy(&buf[rp], &c, sizeof(uint32_t));
rp += sizeof(uint32_t);
memcpy(&buf[rp], str, size);
rp += size;
return rp;
}
int pack_message_v3(struct pam_items *pi, size_t *size, uint8_t **buffer)
{
int len;
uint8_t *buf;
size_t rp;
len = sizeof(uint32_t) + sizeof(uint32_t);
len += *pi->pam_user != '\0' ?
2*sizeof(uint32_t) + pi->pam_user_size : 0;
len += *pi->pam_service != '\0' ?
2*sizeof(uint32_t) + pi->pam_service_size : 0;
len += *pi->pam_tty != '\0' ?
2*sizeof(uint32_t) + pi->pam_tty_size : 0;
len += *pi->pam_ruser != '\0' ?
2*sizeof(uint32_t) + pi->pam_ruser_size : 0;
len += *pi->pam_rhost != '\0' ?
2*sizeof(uint32_t) + pi->pam_rhost_size : 0;
len += pi->pam_authtok != NULL ?
3*sizeof(uint32_t) + pi->pam_authtok_size : 0;
len += pi->pam_newauthtok != NULL ?
3*sizeof(uint32_t) + pi->pam_newauthtok_size : 0;
len += 3*sizeof(uint32_t); /* cli_pid */
len += *pi->requested_domains != '\0' ?
2*sizeof(uint32_t) + pi->requested_domains_size : 0;
len += 3*sizeof(uint32_t); /* flags */
/* optional child_pid */
if(pi->child_pid > 0) {
len += 3*sizeof(uint32_t);
}
buf = malloc(len);
if (buf == NULL) {
D(("malloc failed."));
return PAM_BUF_ERR;
}
rp = 0;
SAFEALIGN_SETMEM_UINT32(buf, SSS_START_OF_PAM_REQUEST, &rp);
rp += add_string_item(SSS_PAM_ITEM_USER, pi->pam_user, pi->pam_user_size,
&buf[rp]);
rp += add_string_item(SSS_PAM_ITEM_SERVICE, pi->pam_service,
pi->pam_service_size, &buf[rp]);
rp += add_string_item(SSS_PAM_ITEM_TTY, pi->pam_tty, pi->pam_tty_size,
&buf[rp]);
rp += add_string_item(SSS_PAM_ITEM_RUSER, pi->pam_ruser, pi->pam_ruser_size,
&buf[rp]);
rp += add_string_item(SSS_PAM_ITEM_RHOST, pi->pam_rhost, pi->pam_rhost_size,
&buf[rp]);
rp += add_string_item(SSS_PAM_ITEM_REQUESTED_DOMAINS, pi->requested_domains, pi->requested_domains_size,
&buf[rp]);
rp += add_uint32_t_item(SSS_PAM_ITEM_CLI_PID, (uint32_t) pi->cli_pid,
&buf[rp]);
if (pi->child_pid > 0) {
rp += add_uint32_t_item(SSS_PAM_ITEM_CHILD_PID,
(uint32_t) pi->child_pid, &buf[rp]);
}
rp += add_authtok_item(SSS_PAM_ITEM_AUTHTOK, pi->pam_authtok_type,
pi->pam_authtok, pi->pam_authtok_size, &buf[rp]);
rp += add_authtok_item(SSS_PAM_ITEM_NEWAUTHTOK, pi->pam_newauthtok_type,
pi->pam_newauthtok, pi->pam_newauthtok_size,
&buf[rp]);
rp += add_uint32_t_item(SSS_PAM_ITEM_FLAGS, (uint32_t) pi->flags,
&buf[rp]);
SAFEALIGN_SETMEM_UINT32(buf + rp, SSS_END_OF_PAM_REQUEST, &rp);
if (rp != len) {
D(("error during packet creation."));
free(buf);
return PAM_BUF_ERR;
}
*size = len;
*buffer = buf;
return 0;
}
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