summaryrefslogtreecommitdiff
path: root/core/opie-login/loginapplication.cpp
blob: 1facf2dec1a1503b6a6330f8881bf7dbb316932f (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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
               =.            This file is part of the OPIE Project
             .=l.            Copyright (c)  2002 Robert Griebl <sandman@handhelds.org>
           .>+-=
 _;:,     .>    :=|.         This file is free software; you can
.> <`_,   >  .   <=          redistribute it and/or modify it under
:`=1 )Y*s>-.--   :           the terms of the GNU General Public
.="- .-=="i,     .._         License as published by the Free Software
 - .   .-<_>     .<>         Foundation; either version 2 of the License,
     ._= =}       :          or (at your option) any later version.
    .%`+i>       _;_.
    .i_,=:_.      -<s.       This file 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 file;
  -_. . .   )=.  =           see the file COPYING. If not, write to the
    --        :-=`           Free Software Foundation, Inc.,
                             59 Temple Place - Suite 330,
                             Boston, MA 02111-1307, USA.

*/

#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/wait.h>

#ifdef USEPAM
extern "C" {
#include <security/pam_appl.h>
}
#else
#include <crypt.h>
#include <shadow.h>
#endif

#include "loginapplication.h"

LoginApplication *lApp;

LoginApplication::LoginApplication ( int &argc, char **argv, pid_t parentpid )
	: QPEApplication ( argc, argv, GuiServer )
{
	lApp = this;
	m_parentpid = parentpid;
}

const char *LoginApplication::s_username = 0;

#ifdef USEPAM

const char *LoginApplication::s_pam_password = 0;

int LoginApplication::pam_helper ( int num_msg, const struct pam_message **msg, struct pam_response **resp, void * )
{
	int replies = 0;
	struct pam_response *reply = 0;
	int size = sizeof( struct pam_response );

	for ( int i = 0; i < num_msg; i++ ) {
		switch ( msg [i]-> msg_style ) {
			case PAM_PROMPT_ECHO_ON: // user name given to PAM already
				return PAM_CONV_ERR;

			case PAM_PROMPT_ECHO_OFF: // wants password
				reply = (struct pam_response *) ::realloc ( reply, size );
				if ( !reply )
					return PAM_CONV_ERR;
				size += sizeof( struct pam_response );

				reply [replies]. resp_retcode = PAM_SUCCESS;
				reply [replies]. resp = ::strdup ( s_pam_password );
				replies++; // PAM frees resp
				break;

			case PAM_TEXT_INFO:
				break;

			default:
				/* unknown or PAM_ERROR_MSG */
				if ( reply )
					::free ( reply );
				return PAM_CONV_ERR;
		}
	}
	if ( reply )
		*resp = reply;
	return PAM_SUCCESS;
}


bool LoginApplication::checkPassword ( const char *user, const char *pass )
{
	static struct pam_conv conv = { &LoginApplication::pam_helper, 0 };

	int pam_error;
	pam_handle_t *pamh = 0;

	pam_error = ::pam_start( "xdm", user, &conv, &pamh );
	if ( pam_error == PAM_SUCCESS ) {
		s_pam_password = pass;
		pam_error = ::pam_authenticate ( pamh, 0 );
		s_pam_password = 0;
	}
	::pam_end ( pamh, pam_error );
	return ( pam_error == PAM_SUCCESS );
}

#else

bool LoginApplication::checkPassword ( const char *user, const char *pass )
{
	char *encrypted, *correct;
	struct passwd *pw;

	if ( !user || !pass )
		return false;

	pw = ::getpwnam ( user );

	if ( !pw )
		return false;

	if (( ::strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( ::strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
		struct spwd *sp = ::getspnam ( pw-> pw_name );

		if ( !sp )
			return false;

		correct = sp-> sp_pwdp;
	}
	else
		correct = pw-> pw_passwd;

	if ( correct == 0 || correct[0] == '\0' )
		return true;

	encrypted = ::crypt ( pass, correct );
	return ( ::strcmp ( encrypted, correct ) == 0 );
}

#endif

bool LoginApplication::changeIdentity ( )
{
	const char *DEFAULT_LOGIN_PATH      = "/bin:/usr/bin";
	const char *DEFAULT_ROOT_LOGIN_PATH = "/usr/sbin:/bin:/usr/bin:/sbin";

	if ( !s_username )
		return false;
	struct passwd *pw = ::getpwnam ( s_username );
	if ( !pw )
		return false;

	// we are still root at this point - try to run the pre-session script
	if ( !runRootScript ( "OPIEDIR", "share/opie-login/pre-session", s_username ))
		qWarning ( "failed to run $OPIEDIR/share/opie-login/pre-session" );

	bool fail = false;
	fail |= ( ::initgroups ( pw-> pw_name, pw-> pw_gid ));
	::endgrent ( );
	fail |= ( ::setgid ( pw-> pw_gid ));
	fail |= ( ::setuid ( pw-> pw_uid ));

	fail |= ( ::chdir ( pw-> pw_dir ) && ::chdir ( "/" ));

	fail |= ( ::setenv ( "HOME",    pw-> pw_dir, 1 ));
	fail |= ( ::setenv ( "SHELL",   pw-> pw_shell, 1 ));
	fail |= ( ::setenv ( "USER",    pw-> pw_name, 1 ));
	fail |= ( ::setenv ( "LOGNAME", pw-> pw_name, 1 ));
	fail |= ( ::setenv ( "PATH",    ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ), 1 ));

	return !fail;
}

bool LoginApplication::login ( )
{
	execUserScript ( "HOME", ".opie-session" );
	execUserScript ( "OPIEDIR", "share/opie-login/opie-session" );
	execUserScript ( "OPIEDIR", "bin/qpe" );
	
	qWarning ( "failed to start an Opie session" );
	return false;
}

void LoginApplication::logout ( )
{
	// we are now root again - try to run the post-session script
	if ( !runRootScript ( "OPIEDIR", "share/opie-login/post-session" ))
		qWarning ( "failed to run $OPIEDIR/scripts/post-session" );	
}


static char *buildarg ( const char *base, const char *script )
{
	const char *dir = base ? ::getenv ( base ) : "/";
	char *arg = new char [::strlen ( dir ) + ::strlen ( script ) + 2];

	::strcpy ( arg, dir );
	::strcat ( arg, "/" );
	::strcat ( arg, script );

	return arg;
}

bool LoginApplication::runRootScript ( const char *base, const char *script, const char *param )
{
	bool res = false;
	char *arg = buildarg ( base, script );

	struct stat st;
	if (( ::stat ( arg, &st ) == 0 ) && ( st. st_uid == 0 )) {
		pid_t child = ::fork ( );	
		
		if ( child == 0 ) {
			::execl ( "/bin/sh", "-sh", arg, param, 0 );
			::_exit ( -1 );
		}
		else if ( child > 0 ) {
			int status = 0;
		
			while ( ::waitpid ( child, &status, 0 ) < 0 ) { }
			res = ( WIFEXITED( status )) && ( WEXITSTATUS( status ) == 0 );
		}
	}
		
	delete [] arg;
	return res;
}

void LoginApplication::execUserScript ( const char *base, const char *script )
{
	char *arg = buildarg ( base, script );

	struct stat st;
	if ( ::stat ( arg, &st ) == 0 ) {
		if ( st. st_mode & S_IXUSR )
			::execl ( "/bin/sh", "-sh", "-c", arg, 0 );
		else
			::execl ( "/bin/sh", "-sh", arg, 0 );
	}
}

const char *LoginApplication::loginAs ( )
{
	return s_username;
}

void LoginApplication::setLoginAs ( const char *name )
{
	s_username = name;
}

QStringList LoginApplication::allUsers ( )
{
	struct passwd *pwd;
	QStringList sl;

	while (( pwd = ::getpwent ( ))) {
		if (( pwd-> pw_uid == 0 ) || ( pwd-> pw_uid >= 500 && pwd-> pw_uid < 65534 ))
			sl << QString ( pwd-> pw_name );
	}

	::endpwent ( );

	return sl;
}

void LoginApplication::quitToConsole ( )
{
	QPEApplication::quit ( );
	::kill ( m_parentpid, SIGTERM );
}