summaryrefslogtreecommitdiffstats
path: root/sesman/scp_v1.c
blob: d3f0ab7f28884dcf87a679bfb2139afd6fa8176c (plain)
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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/**
 * xrdp: A Remote Desktop Protocol server.
 *
 * Copyright (C) Jay Sorg 2004-2012
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 *
 * @file scp_v1.c
 * @brief scp version 1 implementation
 * @author Jay Sorg, Simone Fedele
 *
 */

#include "sesman.h"

//#include "libscp_types.h"
#include "libscp.h"

extern struct config_sesman *g_cfg; /* in sesman.c */

static void parseCommonStates(enum SCP_SERVER_STATES_E e, char *f);

/******************************************************************************/
void DEFAULT_CC
scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
{
    long data;
    int display;
    int retries;
    int current_try;
    enum SCP_SERVER_STATES_E e;
    struct SCP_DISCONNECTED_SESSION *slist;
    struct session_item *sitem;
    int scount;
    SCP_SID sid;

    retries = g_cfg->sec.login_retry;
    current_try = retries;

    data = auth_userpass(s->username, s->password,NULL);
    /*LOG_DBG("user: %s\npass: %s", s->username, s->password);*/

    while ((!data) && ((retries == 0) || (current_try > 0)))
    {
        LOG_DBG("data %d - retry %d - currenttry %d - expr %d",
                data, retries, current_try,
                ((!data) && ((retries == 0) || (current_try > 0))));

        e = scp_v1s_request_password(c, s, "Wrong username and/or password");

        switch (e)
        {
            case SCP_SERVER_STATE_OK:
                /* all ok, we got new username and password */
                data = auth_userpass(s->username, s->password,NULL);

                /* one try less */
                if (current_try > 0)
                {
                    current_try--;
                }

                break;
            default:
                /* we check the other errors */
                parseCommonStates(e, "scp_v1s_list_sessions()");
                scp_session_destroy(s);
                return;
                //break;
        }
    }

    if (!data)
    {
        scp_v1s_deny_connection(c, "Login failed");
        log_message( LOG_LEVEL_INFO,
                     "Login failed for user %s. Connection terminated", s->username);
        scp_session_destroy(s);
        return;
    }

    /* testing if login is allowed*/
    if (0 == access_login_allowed(s->username))
    {
        scp_v1s_deny_connection(c, "Access to Terminal Server not allowed.");
        log_message(LOG_LEVEL_INFO,
                    "User %s not allowed on TS. Connection terminated", s->username);
        scp_session_destroy(s);
        return;
    }

    //check if we need password change

    /* list disconnected sessions */
    slist = session_get_byuser(s->username, &scount, SESMAN_SESSION_STATUS_DISCONNECTED);

    if (scount == 0)
    {
        /* no disconnected sessions - start a new one */
        log_message(LOG_LEVEL_DEBUG, "No disconnected sessions for this user"
                    "- we create a new one");

        if (0 != s->client_ip)
        {
            log_message(LOG_LEVEL_INFO, "++ created session (access granted): username %s, ip %s", s->username, s->client_ip);
        }
        else
        {
            log_message(LOG_LEVEL_INFO, "++ created session (access granted): username %s", s->username);
        }

        if (SCP_SESSION_TYPE_XVNC == s->type)
        {
            log_message(LOG_LEVEL_INFO, "starting Xvnc session...");
            display = session_start(s->width, s->height, s->bpp, s->username,
                                    s->password, data, SESMAN_SESSION_TYPE_XVNC,
                                    s->domain, s->program, s->directory, s->client_ip);
        }
        else
        {
            log_message(LOG_LEVEL_INFO, "starting X11rdp session...");
            display = session_start(s->width, s->height, s->bpp, s->username,
                                    s->password, data, SESMAN_SESSION_TYPE_XRDP,
                                    s->domain, s->program, s->directory, s->client_ip);
        }

        e = scp_v1s_connect_new_session(c, display);

        switch (e)
        {
            case SCP_SERVER_STATE_OK:
                /* all ok, we got new username and password */
                break;
            default:
                /* we check the other errors */
                parseCommonStates(e, "scp_v1s_connect_new_session()");
                break;
        }
    }
    else
    {
        /* one or more disconnected sessions - listing */
        e = scp_v1s_list_sessions(c, scount, slist, &sid);

        switch (e)
        {
                /*case SCP_SERVER_STATE_FORCE_NEW:*/
                /* we should check for MaxSessions */
            case SCP_SERVER_STATE_SELECTION_CANCEL:
                log_message( LOG_LEVEL_INFO, "Connection cancelled after session listing");
                break;
            case SCP_SERVER_STATE_OK:
                /* ok, reconnecting... */
                sitem = session_get_bypid(sid);

                if (0 == sitem)
                {
                    e = scp_v1s_connection_error(c, "Internal error");
                    log_message(LOG_LEVEL_INFO, "Cannot find session item on the chain");
                }
                else
                {
                    display = sitem->display;
                    /*e=scp_v1s_reconnect_session(c, sitem, display);*/
                    e = scp_v1s_reconnect_session(c, display);

                    if (0 != s->client_ip)
                    {
                        log_message(LOG_LEVEL_INFO, "++ reconnected session: username %s, display :%d.0, session_pid %d, ip %s", s->username, display, sitem->pid, s->client_ip);
                    }
                    else
                    {
                        log_message(LOG_LEVEL_INFO, "++ reconnected session: username %s, display :%d.0, session_pid %d", s->username, display, sitem->pid);
                    }

                    g_free(sitem);
                }

                break;
            default:
                /* we check the other errors */
                parseCommonStates(e, "scp_v1s_list_sessions()");
                break;
        }

        g_free(slist);
    }

    /* resource management */
    if ((e == SCP_SERVER_STATE_OK) && (s->rsr))
    {
        /* here goes scp resource sharing code */
    }

    /* cleanup */
    scp_session_destroy(s);
    auth_end(data);
}

static void parseCommonStates(enum SCP_SERVER_STATES_E e, char *f)
{
    switch (e)
    {
        case SCP_SERVER_STATE_VERSION_ERR:
            LOG_DBG("version error")
        case SCP_SERVER_STATE_SIZE_ERR:
            /* an unknown scp version was requested, so we shut down the */
            /* connection (and log the fact)                             */
            log_message(LOG_LEVEL_WARNING,
                        "protocol violation. connection closed.");
            break;
        case SCP_SERVER_STATE_NETWORK_ERR:
            log_message(LOG_LEVEL_WARNING, "libscp network error.");
            break;
        case SCP_SERVER_STATE_SEQUENCE_ERR:
            log_message(LOG_LEVEL_WARNING, "libscp sequence error.");
            break;
        case SCP_SERVER_STATE_INTERNAL_ERR:
            /* internal error occurred (eg. malloc() error, ecc.) */
            log_message(LOG_LEVEL_ERROR, "libscp internal error occurred.");
            break;
        default:
            /* dummy: scp_v1s_request_password won't generate any other */
            /* error other than the ones before                         */
            log_message(LOG_LEVEL_ALWAYS, "unknown return from %s", f);
            break;
    }
}