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
|
/* client_session.c -- Handles eurephia session in admin clients
*
* GPLv2 only - Copyright (C) 2008, 2009
* David Sommerseth <dazo@users.sourceforge.net>
*
* 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; version 2
* of the License.
*
* 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, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* @file client_session.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2008-12-01
*
* @brief Functions for working on eurephiaSESSIONs outside the openvpn plug-in
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <assert.h>
#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephiadb_session_struct.h>
#include <eurephiadb_session_common.h>
#include <eurephiadb_driver.h>
#include <eurephia_log.h>
#include <randstr.h>
#include <sha512.h>
#include "client_config.h"
/**
* Get a file name to a session file. This file can be found in either EUREPHIADM_SESSION
* environment variable, in the users ~/.eurephia or the directory defined by the EUREPHIA_DIR
* environment variable.
*
* @return Returns a full path to the session file on success, otherwise NULL.
*/
char *get_session_file() {
char *fname = NULL;
fname = get_config_filename("EUREPHIADM_SESSION","/session");
if( fname == NULL ) {
// If even default ~/.eurephia dir failed, create one in /tmp
snprintf(fname, 1024, "/tmp/.eurepia-%i.sess", getuid());
return fname;
}
return fname;
}
/**
* Reads the session key and does a quick validation of it.
*
* @param ctx eurephiaCTX
*
* @return Returns a string (char *) containing the session key on success, otherwise NULL.
*/
char *read_session_file(eurephiaCTX *ctx) {
char *sesskey = NULL, *fname = NULL;
FILE *sfp = NULL;
fname = get_session_file();
assert(fname != NULL);
if( (sfp = fopen(fname, "r")) == NULL ) {
return NULL;
}
sesskey = (char *) malloc_nullsafe(ctx, 256);
assert( sesskey != NULL );
if( (fgets(sesskey, 254, sfp) == NULL) || (strlen_nullsafe(sesskey) < 64) ) {
eurephia_log(ctx, LOG_PANIC, 0,
"Could not read session file (%s). Session value too short", fname);
return NULL;
}
fclose(sfp);
return sesskey;
}
/**
* Writes a session key to disk, to keep session logged in over a longer time.
*
* @param ctx eurephiaCTX
* @param sess eurephiaSESSION with session info for the current logged in user.
*
* @return Returns 1 on success, otherwise 0.
*/
int write_session_file(eurephiaCTX *ctx, eurephiaSESSION *sess) {
struct stat fchk;
char *fname = NULL;
FILE *sfp = NULL;
assert((ctx != NULL) && (sess != NULL) && (sess->sessionkey != NULL));
fname = get_session_file();
assert(fname != NULL);
if( stat(fname, &fchk) != -1 ) {
// session file exists, do not update it
return 1;
}
if( (sfp = fopen(fname, "w")) == NULL ) {
eurephia_log(ctx, LOG_PANIC, 0, "Could not create session file (%s). Operation aborted.", fname);
return 0;
}
fprintf(sfp, "%s", sess->sessionkey);
fclose(sfp);
return 1;
}
/**
* Removes the session file, used when logging out or the user is automatically logged out.
*
* @param ctx eurephiaCTX
*/
void remove_session_file(eurephiaCTX *ctx) {
const char *fname = NULL;
fname = get_session_file();
assert(fname != NULL);
if( unlink(fname) == -1) {
eurephia_log(ctx, LOG_ERROR, 0,
"Could not remove session file (%s). Following operations might fail", fname);
};
}
/**
* Create a eurephiaSESSION. If session key is given, it will try to load that session back.
* If no session key is given, it will create a brand new user session.
*
* @param ctx eurephiaCTX
* @param sesskey session key, used for loading existing sessions back.
*
* @return Returns a eurephiaSESSION pointer to a session, either new or old. On failure, NULL is returned.
*/
eurephiaSESSION *create_session(eurephiaCTX *ctx, const char *sesskey) {
eurephiaSESSION *new_sess = NULL;
int loop, uniqchk;
char *randdata = NULL;
unsigned char sha_res[SHA512_HASH_SIZE+2];
SHA512Context sha;
new_sess = (eurephiaSESSION *) malloc_nullsafe(ctx, sizeof(eurephiaSESSION) + 2);
assert(new_sess != NULL);
if( sesskey == NULL ) {
// Get data for a unique session key
randdata = (char *) malloc_nullsafe(ctx, 514);
assert(randdata != NULL);
do {
char *ptr = NULL;
int i = 0;
if( !eurephia_randstring(ctx, randdata, 512) ) {
eurephia_log(ctx, LOG_FATAL, 0,
"Could not generate enough random data for session");
free_nullsafe(ctx, randdata);
free_nullsafe(ctx, new_sess);
return NULL;
}
memset(&sha, 0, sizeof(SHA512Context));
memset(&sha_res, 0, SHA512_HASH_SIZE+2);
free_nullsafe(ctx, new_sess->sessionkey);
new_sess->sessionkey = (char *) malloc_nullsafe(ctx, (SHA512_HASH_SIZE*2) + 3);
assert(new_sess->sessionkey != NULL);
SHA512Init(&sha);
SHA512Update(&sha, randdata, 512);
SHA512Final(&sha, sha_res);
ptr = new_sess->sessionkey;
for( i = 0; i < SHA512_HASH_SIZE; i++ ) {
sprintf(ptr, "%02x", sha_res[i]);
ptr++;
}
memset(&sha, 0, sizeof(SHA512Context));
memset(&sha_res, 0, sizeof(sha_res));
loop++;
uniqchk = eDBcheck_sessionkey_uniqueness(ctx, new_sess->sessionkey);
memset(randdata, 0, 514);
} while( (uniqchk == 0) && (loop < 11) );
free_nullsafe(ctx, randdata);
if( uniqchk == 0 ) {
eurephia_log(ctx, LOG_FATAL, 0,
"Did not manage to create a unique session key after %i attempts."
" Aborting.", loop-1);
free_nullsafe(ctx, new_sess->sessionkey);
free_nullsafe(ctx, new_sess);
return NULL;
}
} else {
new_sess->sessionkey = strdup(sesskey);
new_sess->sessvals = eDBload_sessiondata(ctx, new_sess->sessionkey);
}
// Return new session
return new_sess;
}
|
