summaryrefslogtreecommitdiff
path: root/ldap/xpcom/src/nsLDAPSecurityGlue.cpp
blob: c39723a72ab1f2029f9be97b6f969d4acef83b28 (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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// Only build this code if PSM is being built also
//
#include "nsLDAPInternal.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsIInterfaceRequestor.h"
#include "nsNetCID.h"
#include "nsISocketProvider.h"
#include "nsISSLSocketControl.h"
#include "nsString.h"
#include "nsMemory.h"
#include "plstr.h"
#include "ldap.h"
#include "ldappr.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"

// LDAP per-session data structure.
//
typedef struct {
    char *hostname;
    LDAP_X_EXTIOF_CLOSE_CALLBACK *realClose;
    LDAP_X_EXTIOF_CONNECT_CALLBACK *realConnect;
    LDAP_X_EXTIOF_DISPOSEHANDLE_CALLBACK *realDisposeHandle;
} nsLDAPSSLSessionClosure;

// LDAP per-socket data structure.
//
typedef struct {
    nsLDAPSSLSessionClosure *sessionClosure; /* session info */
} nsLDAPSSLSocketClosure;

// free the per-socket data structure as necessary
//
static void
nsLDAPSSLFreeSocketClosure(nsLDAPSSLSocketClosure **aClosure)
{
    if (aClosure && *aClosure) {
	free(*aClosure);
	*aClosure = nullptr;
    }
}

// Replacement close() function, which cleans up local stuff associated
// with this socket, and then calls the real close function.
//
extern "C" int LDAP_CALLBACK
nsLDAPSSLClose(int s, struct lextiof_socket_private *socketarg)
{
    PRLDAPSocketInfo socketInfo;
    nsLDAPSSLSocketClosure *socketClosure;
    nsLDAPSSLSessionClosure *sessionClosure;

    // get the socketInfo associated with this socket
    //
    memset(&socketInfo, 0, sizeof(socketInfo));
    socketInfo.soinfo_size = PRLDAP_SOCKETINFO_SIZE;
    if (prldap_get_socket_info(s, socketarg, &socketInfo) != LDAP_SUCCESS) {
	NS_ERROR("nsLDAPSSLClose(): prldap_get_socket_info() failed\n");
	return -1;
    }

    // save off the session closure data in an automatic, since we're going to
    // need to call through it
    //
    socketClosure = reinterpret_cast<nsLDAPSSLSocketClosure *>
                                    (socketInfo.soinfo_appdata);
    sessionClosure = socketClosure->sessionClosure;

    // free the socket closure data
    //
    nsLDAPSSLFreeSocketClosure(
	reinterpret_cast<nsLDAPSSLSocketClosure **>
                 (&socketInfo.soinfo_appdata));

    // call the real close function
    //
    return (*(sessionClosure->realClose))(s, socketarg);
}

// Replacement connection function.  Calls the real connect function,
// 
extern "C" int LDAP_CALLBACK
nsLDAPSSLConnect(const char *hostlist, int defport, int timeout,
		 unsigned long options, 
		 struct lextiof_session_private *sessionarg,
		 struct lextiof_socket_private **socketargp )
{
    PRLDAPSocketInfo socketInfo;
    PRLDAPSessionInfo sessionInfo;
    nsLDAPSSLSocketClosure *socketClosure = nullptr;
    nsLDAPSSLSessionClosure *sessionClosure;
    int	intfd = -1;
    nsCOMPtr <nsISupports> securityInfo;
    nsCOMPtr <nsISocketProvider> tlsSocketProvider;
    nsCOMPtr <nsISSLSocketControl> sslSocketControl;
    nsresult rv;

    // Ensure secure option is set.  Also, clear secure bit in options
    // the we pass to the standard connect() function (since it doesn't know
    // how to handle the secure option).
    //
    NS_ASSERTION(options & LDAP_X_EXTIOF_OPT_SECURE, 
		 "nsLDAPSSLConnect(): called for non-secure connection");
    options &= ~LDAP_X_EXTIOF_OPT_SECURE;

    // Retrieve session info. so we can store a pointer to our session info.
    // in our socket info. later.
    //
    memset(&sessionInfo, 0, sizeof(sessionInfo));
    sessionInfo.seinfo_size = PRLDAP_SESSIONINFO_SIZE;
    if (prldap_get_session_info(nullptr, sessionarg, &sessionInfo) 
	!= LDAP_SUCCESS) {
	NS_ERROR("nsLDAPSSLConnect(): unable to get session info");
        return -1;
    }
    sessionClosure = reinterpret_cast<nsLDAPSSLSessionClosure *>
                                     (sessionInfo.seinfo_appdata);
    
    // Call the real connect() callback to make the TCP connection.  If it
    // succeeds, *socketargp is set.
    //
    intfd = (*(sessionClosure->realConnect))(hostlist, defport, timeout, 
					     options, sessionarg, socketargp);
    if ( intfd < 0 ) {
	PR_LOG(gLDAPLogModule, PR_LOG_DEBUG,
	       ("nsLDAPSSLConnect(): standard connect() function returned %d",
		intfd));
        return intfd;
    }

    // Retrieve socket info from the newly created socket so that we
    // have the PRFileDesc onto which we will be layering SSL.
    //
    memset(&socketInfo, 0, sizeof(socketInfo));
    socketInfo.soinfo_size = PRLDAP_SOCKETINFO_SIZE;
    if (prldap_get_socket_info(intfd, *socketargp, &socketInfo)
	!= LDAP_SUCCESS)  {
	NS_ERROR("nsLDAPSSLConnect(): unable to get socket info");
        goto close_socket_and_exit_with_error;
    }

    // Allocate a structure to hold our socket-specific data.
    //
    socketClosure = static_cast<nsLDAPSSLSocketClosure *>(moz_xmalloc(
				       sizeof(nsLDAPSSLSocketClosure)));
    if (!socketClosure) {
	NS_WARNING("nsLDAPSSLConnect(): unable to allocate socket closure");
	goto close_socket_and_exit_with_error;
    }
    memset(socketClosure, 0, sizeof(nsLDAPSSLSocketClosure));
    socketClosure->sessionClosure = sessionClosure;

    // Add the NSPR layer for SSL provided by PSM to this socket. 
    //
    tlsSocketProvider = do_GetService(NS_STARTTLSSOCKETPROVIDER_CONTRACTID, 
				      &rv);
    if (NS_FAILED(rv)) {
	NS_ERROR("nsLDAPSSLConnect(): unable to get socket provider service");
        goto close_socket_and_exit_with_error;
    }
    // XXXdmose: Note that hostlist can be a list of hosts (in the
    // current XPCOM SDK code, it will always be a list of IP
    // addresses).  Because of this, we need to use
    // sessionClosure->hostname which was passed in separately to tell
    // AddToSocket what to match the name in the certificate against.
    // What exactly happen will happen when this is used with some IP
    // address in the list other than the first one is not entirely
    // clear, and I suspect it may depend on the format of the name in
    // the certificate.  Need to investigate.
    //
    rv = tlsSocketProvider->AddToSocket(PR_AF_INET,
                                        sessionClosure->hostname,
                                        defport,
                                        nullptr,
                                        mozilla::NeckoOriginAttributes(),
                                        0,
                                        socketInfo.soinfo_prfd,
                                        getter_AddRefs(securityInfo));
    if (NS_FAILED(rv)) {
	NS_ERROR("nsLDAPSSLConnect(): unable to add SSL layer to socket");
        goto close_socket_and_exit_with_error;
    }

    // If possible we want to avoid using SSLv2, as this can confuse
    // some directory servers (notably the netscape 4.1 ds).  The only
    // way that PSM provides for us to do this is to use a socket that can
    // be used for the STARTTLS protocol, because the STARTTLS protocol disallows
    // the use of SSLv2.
    // (Thanks to Brian Ryner for helping figure this out).
    //
    sslSocketControl = do_QueryInterface(securityInfo, &rv);
    if (NS_FAILED(rv)) {
        NS_WARNING("nsLDAPSSLConnect(): unable to QI to nsISSLSocketControl");
    } else {
	rv = sslSocketControl->StartTLS();
	if (NS_FAILED(rv)) {
	    NS_WARNING("nsLDAPSSLConnect(): StartTLS failed");
	}
    }

    // Attach our closure to the socketInfo.
    //
    socketInfo.soinfo_appdata = reinterpret_cast<prldap_socket_private *>
                                                (socketClosure);
    if (prldap_set_socket_info(intfd, *socketargp, &socketInfo)
	!= LDAP_SUCCESS ) {
	NS_ERROR("nsLDAPSSLConnect(): unable to set socket info");
    }
    return intfd;	// success

close_socket_and_exit_with_error:
    if (socketInfo.soinfo_prfd) {
	PR_Close(socketInfo.soinfo_prfd);
    }
    if (socketClosure) {
        nsLDAPSSLFreeSocketClosure(&socketClosure);
    }
    if ( intfd >= 0 && *socketargp ) {
        (*(sessionClosure->realClose))(intfd, *socketargp);
    }
    return -1;

}

// Free data associated with this session (LDAP *) as necessary.
//
static void
nsLDAPSSLFreeSessionClosure(nsLDAPSSLSessionClosure **aSessionClosure)
{
    if (aSessionClosure && *aSessionClosure) {

	// free the hostname
	//
	if ( (*aSessionClosure)->hostname ) {
	    PL_strfree((*aSessionClosure)->hostname);
	    (*aSessionClosure)->hostname = nullptr;
	}

	// free the structure itself
	//
	free(*aSessionClosure);
	*aSessionClosure = nullptr;
    }
}

// Replacement session handle disposal code.  First cleans up our local
// stuff, then calls the original session handle disposal function.
//
extern "C" void LDAP_CALLBACK
nsLDAPSSLDisposeHandle(LDAP *ld, struct lextiof_session_private *sessionarg)
{
    PRLDAPSessionInfo sessionInfo;
    nsLDAPSSLSessionClosure *sessionClosure;
    LDAP_X_EXTIOF_DISPOSEHANDLE_CALLBACK *disposehdl_fn;

    memset(&sessionInfo, 0, sizeof(sessionInfo));
    sessionInfo.seinfo_size = PRLDAP_SESSIONINFO_SIZE;
    if (prldap_get_session_info(ld, nullptr, &sessionInfo) == LDAP_SUCCESS) {
	sessionClosure = reinterpret_cast<nsLDAPSSLSessionClosure *>
                                  (sessionInfo.seinfo_appdata);
	disposehdl_fn = sessionClosure->realDisposeHandle;
	nsLDAPSSLFreeSessionClosure(&sessionClosure);
	(*disposehdl_fn)(ld, sessionarg);
    } 
}

// Installs appropriate routines and data for making this connection
// handle SSL.  The aHostName is ultimately passed to PSM and is used to
// validate certificates.
//
nsresult
nsLDAPInstallSSL( LDAP *ld, const char *aHostName)
{
    struct ldap_x_ext_io_fns iofns;
    nsLDAPSSLSessionClosure *sessionClosure;
    PRLDAPSessionInfo sessionInfo;

    // Allocate our own session information.
    //
    sessionClosure = static_cast<nsLDAPSSLSessionClosure *>(moz_xmalloc(
					sizeof(nsLDAPSSLSessionClosure)));
    if (!sessionClosure) {
	return NS_ERROR_OUT_OF_MEMORY;
    }
    memset(sessionClosure, 0, sizeof(nsLDAPSSLSessionClosure));

    // Override a few functions, saving a pointer to the original function
    // in each case so we can call it from our SSL savvy functions.
    //
    memset(&iofns, 0, sizeof(iofns));
    iofns.lextiof_size = LDAP_X_EXTIO_FNS_SIZE;
    if (ldap_get_option(ld, LDAP_X_OPT_EXTIO_FN_PTRS, 
			static_cast<void *>(&iofns)) != LDAP_SUCCESS) {
	NS_ERROR("nsLDAPInstallSSL(): unexpected error getting"
		 " LDAP_X_OPT_EXTIO_FN_PTRS");
	nsLDAPSSLFreeSessionClosure(&sessionClosure);
        return NS_ERROR_UNEXPECTED;
    }

    // Make a copy of the hostname to pass to AddToSocket later
    //
    sessionClosure->hostname = PL_strdup(aHostName);
    if (!sessionClosure->hostname) {
	NS_ERROR("nsLDAPInstallSSL(): PL_strdup failed\n");
	nsLDAPSSLFreeSessionClosure(&sessionClosure);
	return NS_ERROR_OUT_OF_MEMORY;
    }

    // Override functions
    //
    sessionClosure->realClose = iofns.lextiof_close;
    iofns.lextiof_close = nsLDAPSSLClose;
    sessionClosure->realConnect = iofns.lextiof_connect;
    iofns.lextiof_connect = nsLDAPSSLConnect;
    sessionClosure->realDisposeHandle = iofns.lextiof_disposehandle;
    iofns.lextiof_disposehandle = nsLDAPSSLDisposeHandle;

    if (ldap_set_option(ld, LDAP_X_OPT_EXTIO_FN_PTRS, 
			static_cast<void *>(&iofns)) != LDAP_SUCCESS) {
	NS_ERROR("nsLDAPInstallSSL(): error setting LDAP_X_OPT_EXTIO_FN_PTRS");
	nsLDAPSSLFreeSessionClosure(&sessionClosure);
        return NS_ERROR_FAILURE;
    }

    // Store session info. for later retrieval.
    //
    sessionInfo.seinfo_size = PRLDAP_SESSIONINFO_SIZE;
    sessionInfo.seinfo_appdata = reinterpret_cast<prldap_session_private *>
                                                 (sessionClosure);
    if (prldap_set_session_info(ld, nullptr, &sessionInfo) != LDAP_SUCCESS) {
	NS_ERROR("nsLDAPInstallSSL(): error setting prldap session info");
	free(sessionClosure);
	return NS_ERROR_UNEXPECTED;
    }

    return NS_OK;
}