1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
* ProFTPD - mod_sftp services
* Copyright (c) 2008-2011 TJ Saunders
*
* This program 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*
* $Id: service.c,v 1.6 2011/05/23 21:03:12 castaglia Exp $
*/
#include "mod_sftp.h"
#include "ssh2.h"
#include "service.h"
#include "msg.h"
#include "packet.h"
#include "disconnect.h"
static pool *service_pool = NULL;
static const char *trace_channel = "ssh2";
static int read_service_req(struct ssh2_packet *pkt, char **service) {
char *buf, *service_name;
uint32_t buflen;
cmd_rec *cmd;
buf = pkt->payload;
buflen = pkt->payload_len;
service_name = sftp_msg_read_string(pkt->pool, &buf, &buflen);
pr_trace_msg(trace_channel, 10, "'%s' service requested", service_name);
cmd = pr_cmd_alloc(pkt->pool, 1, pstrdup(pkt->pool, "SERVICE_REQUEST"));
cmd->arg = service_name;
cmd->class = CL_MISC;
if (strncmp(service_name, "ssh-userauth", 13) == 0 ||
strncmp(service_name, "ssh-connection", 14) == 0) {
if (service)
*service = pstrdup(service_pool, service_name);
pr_cmd_dispatch_phase(cmd, LOG_CMD, 0);
return 0;
}
(void) pr_log_writefile(sftp_logfd, MOD_SFTP_VERSION,
"client requested unsupported '%s' service", service_name);
pr_cmd_dispatch_phase(cmd, LOG_CMD_ERR, 0);
return -1;
}
static int write_service_accept(struct ssh2_packet *pkt, const char *service) {
char *buf, *ptr;
uint32_t buflen, bufsz = 1024;
buflen = bufsz;
ptr = buf = palloc(pkt->pool, bufsz);
sftp_msg_write_byte(&buf, &buflen, SFTP_SSH2_MSG_SERVICE_ACCEPT);
sftp_msg_write_string(&buf, &buflen, service);
pkt->payload = ptr;
pkt->payload_len = (bufsz - buflen);
return 0;
}
int sftp_service_handle(struct ssh2_packet *pkt) {
int res;
char *service = NULL;
res = read_service_req(pkt, &service);
if (res < 0) {
destroy_pool(pkt->pool);
SFTP_DISCONNECT_CONN(SFTP_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE, NULL);
}
destroy_pool(pkt->pool);
pkt = sftp_ssh2_packet_create(service_pool);
res = write_service_accept(pkt, service);
if (res < 0) {
destroy_pool(pkt->pool);
return -1;
}
res = sftp_ssh2_packet_write(sftp_conn->wfd, pkt);
if (res < 0) {
destroy_pool(pkt->pool);
return -1;
}
destroy_pool(pkt->pool);
return 0;
}
int sftp_service_init(void) {
if (service_pool == NULL) {
service_pool = make_sub_pool(sftp_pool);
pr_pool_tag(service_pool, "Service Pool");
}
return 0;
}
|
