source: UsbWattMeter/trunk/curl-7.47.1/lib/security.c@ 164

Last change on this file since 164 was 164, checked in by coas-nagasima, 6 years ago

TOPPERS/ECNLサンプルアプリ「USB充電器電力計」を追加

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1/* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
2 * use in Curl. His latest changes were done 2000-09-18.
3 *
4 * It has since been patched and modified a lot by Daniel Stenberg
5 * <daniel@haxx.se> to make it better applied to curl conditions, and to make
6 * it not use globals, pollute name space and more. This source code awaits a
7 * rewrite to work around the paragraph 2 in the BSD licenses as explained
8 * below.
9 *
10 * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
11 * (Royal Institute of Technology, Stockholm, Sweden).
12 *
13 * Copyright (C) 2001 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
14 *
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 *
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 *
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * 3. Neither the name of the Institute nor the names of its contributors
29 * may be used to endorse or promote products derived from this software
30 * without specific prior written permission.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE. */
43
44#include "curl_setup.h"
45
46#ifndef CURL_DISABLE_FTP
47#ifdef HAVE_GSSAPI
48
49#ifdef HAVE_NETDB_H
50#include <netdb.h>
51#endif
52
53#ifdef HAVE_LIMITS_H
54#include <limits.h>
55#endif
56
57#include "urldata.h"
58#include "curl_base64.h"
59#include "curl_memory.h"
60#include "curl_sec.h"
61#include "ftp.h"
62#include "sendf.h"
63#include "rawstr.h"
64#include "warnless.h"
65
66/* The last #include file should be: */
67#include "memdebug.h"
68
69static const struct {
70 enum protection_level level;
71 const char *name;
72} level_names[] = {
73 { PROT_CLEAR, "clear" },
74 { PROT_SAFE, "safe" },
75 { PROT_CONFIDENTIAL, "confidential" },
76 { PROT_PRIVATE, "private" }
77};
78
79static enum protection_level
80name_to_level(const char *name)
81{
82 int i;
83 for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
84 if(checkprefix(name, level_names[i].name))
85 return level_names[i].level;
86 return PROT_NONE;
87}
88
89/* Convert a protocol |level| to its char representation.
90 We take an int to catch programming mistakes. */
91static char level_to_char(int level) {
92 switch(level) {
93 case PROT_CLEAR:
94 return 'C';
95 case PROT_SAFE:
96 return 'S';
97 case PROT_CONFIDENTIAL:
98 return 'E';
99 case PROT_PRIVATE:
100 return 'P';
101 case PROT_CMD:
102 /* Fall through */
103 default:
104 /* Those 2 cases should not be reached! */
105 break;
106 }
107 DEBUGASSERT(0);
108 /* Default to the most secure alternative. */
109 return 'P';
110}
111
112/* Send an FTP command defined by |message| and the optional arguments. The
113 function returns the ftp_code. If an error occurs, -1 is returned. */
114static int ftp_send_command(struct connectdata *conn, const char *message, ...)
115{
116 int ftp_code;
117 ssize_t nread=0;
118 va_list args;
119 char print_buffer[50];
120
121 va_start(args, message);
122 vsnprintf(print_buffer, sizeof(print_buffer), message, args);
123 va_end(args);
124
125 if(Curl_ftpsendf(conn, print_buffer)) {
126 ftp_code = -1;
127 }
128 else {
129 if(Curl_GetFTPResponse(&nread, conn, &ftp_code))
130 ftp_code = -1;
131 }
132
133 (void)nread; /* Unused */
134 return ftp_code;
135}
136
137/* Read |len| from the socket |fd| and store it in |to|. Return a CURLcode
138 saying whether an error occurred or CURLE_OK if |len| was read. */
139static CURLcode
140socket_read(curl_socket_t fd, void *to, size_t len)
141{
142 char *to_p = to;
143 CURLcode result;
144 ssize_t nread;
145
146 while(len > 0) {
147 result = Curl_read_plain(fd, to_p, len, &nread);
148 if(!result) {
149 len -= nread;
150 to_p += nread;
151 }
152 else {
153 /* FIXME: We are doing a busy wait */
154 if(result == CURLE_AGAIN)
155 continue;
156 return result;
157 }
158 }
159 return CURLE_OK;
160}
161
162
163/* Write |len| bytes from the buffer |to| to the socket |fd|. Return a
164 CURLcode saying whether an error occurred or CURLE_OK if |len| was
165 written. */
166static CURLcode
167socket_write(struct connectdata *conn, curl_socket_t fd, const void *to,
168 size_t len)
169{
170 const char *to_p = to;
171 CURLcode result;
172 ssize_t written;
173
174 while(len > 0) {
175 result = Curl_write_plain(conn, fd, to_p, len, &written);
176 if(!result) {
177 len -= written;
178 to_p += written;
179 }
180 else {
181 /* FIXME: We are doing a busy wait */
182 if(result == CURLE_AGAIN)
183 continue;
184 return result;
185 }
186 }
187 return CURLE_OK;
188}
189
190static CURLcode read_data(struct connectdata *conn,
191 curl_socket_t fd,
192 struct krb5buffer *buf)
193{
194 int len;
195 void* tmp;
196 CURLcode result;
197
198 result = socket_read(fd, &len, sizeof(len));
199 if(result)
200 return result;
201
202 len = ntohl(len);
203 tmp = realloc(buf->data, len);
204 if(tmp == NULL)
205 return CURLE_OUT_OF_MEMORY;
206
207 buf->data = tmp;
208 result = socket_read(fd, buf->data, len);
209 if(result)
210 return result;
211 buf->size = conn->mech->decode(conn->app_data, buf->data, len,
212 conn->data_prot, conn);
213 buf->index = 0;
214 return CURLE_OK;
215}
216
217static size_t
218buffer_read(struct krb5buffer *buf, void *data, size_t len)
219{
220 if(buf->size - buf->index < len)
221 len = buf->size - buf->index;
222 memcpy(data, (char*)buf->data + buf->index, len);
223 buf->index += len;
224 return len;
225}
226
227/* Matches Curl_recv signature */
228static ssize_t sec_recv(struct connectdata *conn, int sockindex,
229 char *buffer, size_t len, CURLcode *err)
230{
231 size_t bytes_read;
232 size_t total_read = 0;
233 curl_socket_t fd = conn->sock[sockindex];
234
235 *err = CURLE_OK;
236
237 /* Handle clear text response. */
238 if(conn->sec_complete == 0 || conn->data_prot == PROT_CLEAR)
239 return read(fd, buffer, len);
240
241 if(conn->in_buffer.eof_flag) {
242 conn->in_buffer.eof_flag = 0;
243 return 0;
244 }
245
246 bytes_read = buffer_read(&conn->in_buffer, buffer, len);
247 len -= bytes_read;
248 total_read += bytes_read;
249 buffer += bytes_read;
250
251 while(len > 0) {
252 if(read_data(conn, fd, &conn->in_buffer))
253 return -1;
254 if(conn->in_buffer.size == 0) {
255 if(bytes_read > 0)
256 conn->in_buffer.eof_flag = 1;
257 return bytes_read;
258 }
259 bytes_read = buffer_read(&conn->in_buffer, buffer, len);
260 len -= bytes_read;
261 total_read += bytes_read;
262 buffer += bytes_read;
263 }
264 /* FIXME: Check for overflow */
265 return total_read;
266}
267
268/* Send |length| bytes from |from| to the |fd| socket taking care of encoding
269 and negociating with the server. |from| can be NULL. */
270/* FIXME: We don't check for errors nor report any! */
271static void do_sec_send(struct connectdata *conn, curl_socket_t fd,
272 const char *from, int length)
273{
274 int bytes, htonl_bytes; /* 32-bit integers for htonl */
275 char *buffer = NULL;
276 char *cmd_buffer;
277 size_t cmd_size = 0;
278 CURLcode error;
279 enum protection_level prot_level = conn->data_prot;
280 bool iscmd = (prot_level == PROT_CMD)?TRUE:FALSE;
281
282 DEBUGASSERT(prot_level > PROT_NONE && prot_level < PROT_LAST);
283
284 if(iscmd) {
285 if(!strncmp(from, "PASS ", 5) || !strncmp(from, "ACCT ", 5))
286 prot_level = PROT_PRIVATE;
287 else
288 prot_level = conn->command_prot;
289 }
290 bytes = conn->mech->encode(conn->app_data, from, length, prot_level,
291 (void**)&buffer);
292 if(!buffer || bytes <= 0)
293 return; /* error */
294
295 if(iscmd) {
296 error = Curl_base64_encode(conn->data, buffer, curlx_sitouz(bytes),
297 &cmd_buffer, &cmd_size);
298 if(error) {
299 free(buffer);
300 return; /* error */
301 }
302 if(cmd_size > 0) {
303 static const char *enc = "ENC ";
304 static const char *mic = "MIC ";
305 if(prot_level == PROT_PRIVATE)
306 socket_write(conn, fd, enc, 4);
307 else
308 socket_write(conn, fd, mic, 4);
309
310 socket_write(conn, fd, cmd_buffer, cmd_size);
311 socket_write(conn, fd, "\r\n", 2);
312 infof(conn->data, "Send: %s%s\n", prot_level == PROT_PRIVATE?enc:mic,
313 cmd_buffer);
314 free(cmd_buffer);
315 }
316 }
317 else {
318 htonl_bytes = htonl(bytes);
319 socket_write(conn, fd, &htonl_bytes, sizeof(htonl_bytes));
320 socket_write(conn, fd, buffer, curlx_sitouz(bytes));
321 }
322 free(buffer);
323}
324
325static ssize_t sec_write(struct connectdata *conn, curl_socket_t fd,
326 const char *buffer, size_t length)
327{
328 ssize_t tx = 0, len = conn->buffer_size;
329
330 len -= conn->mech->overhead(conn->app_data, conn->data_prot,
331 curlx_sztosi(len));
332 if(len <= 0)
333 len = length;
334 while(length) {
335 if(length < (size_t)len)
336 len = length;
337
338 do_sec_send(conn, fd, buffer, curlx_sztosi(len));
339 length -= len;
340 buffer += len;
341 tx += len;
342 }
343 return tx;
344}
345
346/* Matches Curl_send signature */
347static ssize_t sec_send(struct connectdata *conn, int sockindex,
348 const void *buffer, size_t len, CURLcode *err)
349{
350 curl_socket_t fd = conn->sock[sockindex];
351 *err = CURLE_OK;
352 return sec_write(conn, fd, buffer, len);
353}
354
355int Curl_sec_read_msg(struct connectdata *conn, char *buffer,
356 enum protection_level level)
357{
358 /* decoded_len should be size_t or ssize_t but conn->mech->decode returns an
359 int */
360 int decoded_len;
361 char *buf;
362 int ret_code = 0;
363 size_t decoded_sz = 0;
364 CURLcode error;
365
366 DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
367
368 error = Curl_base64_decode(buffer + 4, (unsigned char **)&buf, &decoded_sz);
369 if(error || decoded_sz == 0)
370 return -1;
371
372 if(decoded_sz > (size_t)INT_MAX) {
373 free(buf);
374 return -1;
375 }
376 decoded_len = curlx_uztosi(decoded_sz);
377
378 decoded_len = conn->mech->decode(conn->app_data, buf, decoded_len,
379 level, conn);
380 if(decoded_len <= 0) {
381 free(buf);
382 return -1;
383 }
384
385 if(conn->data->set.verbose) {
386 buf[decoded_len] = '\n';
387 Curl_debug(conn->data, CURLINFO_HEADER_IN, buf, decoded_len + 1, conn);
388 }
389
390 buf[decoded_len] = '\0';
391 if(decoded_len <= 3)
392 /* suspiciously short */
393 return 0;
394
395 if(buf[3] != '-')
396 /* safe to ignore return code */
397 (void)sscanf(buf, "%d", &ret_code);
398
399 if(buf[decoded_len - 1] == '\n')
400 buf[decoded_len - 1] = '\0';
401 /* FIXME: Is |buffer| length always greater than |decoded_len|? */
402 strcpy(buffer, buf);
403 free(buf);
404 return ret_code;
405}
406
407/* FIXME: The error code returned here is never checked. */
408static int sec_set_protection_level(struct connectdata *conn)
409{
410 int code;
411 char* pbsz;
412 static unsigned int buffer_size = 1 << 20; /* 1048576 */
413 enum protection_level level = conn->request_data_prot;
414
415 DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
416
417 if(!conn->sec_complete) {
418 infof(conn->data, "Trying to change the protection level after the"
419 "completion of the data exchange.\n");
420 return -1;
421 }
422
423 /* Bail out if we try to set up the same level */
424 if(conn->data_prot == level)
425 return 0;
426
427 if(level) {
428 code = ftp_send_command(conn, "PBSZ %u", buffer_size);
429 if(code < 0)
430 return -1;
431
432 if(code/100 != 2) {
433 failf(conn->data, "Failed to set the protection's buffer size.");
434 return -1;
435 }
436 conn->buffer_size = buffer_size;
437
438 pbsz = strstr(conn->data->state.buffer, "PBSZ=");
439 if(pbsz) {
440 /* ignore return code, use default value if it fails */
441 (void)sscanf(pbsz, "PBSZ=%u", &buffer_size);
442 if(buffer_size < conn->buffer_size)
443 conn->buffer_size = buffer_size;
444 }
445 }
446
447 /* Now try to negiociate the protection level. */
448 code = ftp_send_command(conn, "PROT %c", level_to_char(level));
449
450 if(code < 0)
451 return -1;
452
453 if(code/100 != 2) {
454 failf(conn->data, "Failed to set the protection level.");
455 return -1;
456 }
457
458 conn->data_prot = level;
459 if(level == PROT_PRIVATE)
460 conn->command_prot = level;
461
462 return 0;
463}
464
465int
466Curl_sec_request_prot(struct connectdata *conn, const char *level)
467{
468 enum protection_level l = name_to_level(level);
469 if(l == PROT_NONE)
470 return -1;
471 DEBUGASSERT(l > PROT_NONE && l < PROT_LAST);
472 conn->request_data_prot = l;
473 return 0;
474}
475
476static CURLcode choose_mech(struct connectdata *conn)
477{
478 int ret;
479 struct SessionHandle *data = conn->data;
480 void *tmp_allocation;
481 const struct Curl_sec_client_mech *mech = &Curl_krb5_client_mech;
482
483 tmp_allocation = realloc(conn->app_data, mech->size);
484 if(tmp_allocation == NULL) {
485 failf(data, "Failed realloc of size %u", mech->size);
486 mech = NULL;
487 return CURLE_OUT_OF_MEMORY;
488 }
489 conn->app_data = tmp_allocation;
490
491 if(mech->init) {
492 ret = mech->init(conn->app_data);
493 if(ret) {
494 infof(data, "Failed initialization for %s. Skipping it.\n",
495 mech->name);
496 return CURLE_FAILED_INIT;
497 }
498 }
499
500 infof(data, "Trying mechanism %s...\n", mech->name);
501 ret = ftp_send_command(conn, "AUTH %s", mech->name);
502 if(ret < 0)
503 /* FIXME: This error is too generic but it is OK for now. */
504 return CURLE_COULDNT_CONNECT;
505
506 if(ret/100 != 3) {
507 switch(ret) {
508 case 504:
509 infof(data, "Mechanism %s is not supported by the server (server "
510 "returned ftp code: 504).\n", mech->name);
511 break;
512 case 534:
513 infof(data, "Mechanism %s was rejected by the server (server returned "
514 "ftp code: 534).\n", mech->name);
515 break;
516 default:
517 if(ret/100 == 5) {
518 infof(data, "server does not support the security extensions\n");
519 return CURLE_USE_SSL_FAILED;
520 }
521 break;
522 }
523 return CURLE_LOGIN_DENIED;
524 }
525
526 /* Authenticate */
527 ret = mech->auth(conn->app_data, conn);
528
529 if(ret != AUTH_CONTINUE) {
530 if(ret != AUTH_OK) {
531 /* Mechanism has dumped the error to stderr, don't error here. */
532 return -1;
533 }
534 DEBUGASSERT(ret == AUTH_OK);
535
536 conn->mech = mech;
537 conn->sec_complete = 1;
538 conn->recv[FIRSTSOCKET] = sec_recv;
539 conn->send[FIRSTSOCKET] = sec_send;
540 conn->recv[SECONDARYSOCKET] = sec_recv;
541 conn->send[SECONDARYSOCKET] = sec_send;
542 conn->command_prot = PROT_SAFE;
543 /* Set the requested protection level */
544 /* BLOCKING */
545 (void)sec_set_protection_level(conn);
546 }
547
548 return CURLE_OK;
549}
550
551CURLcode
552Curl_sec_login(struct connectdata *conn)
553{
554 return choose_mech(conn);
555}
556
557
558void
559Curl_sec_end(struct connectdata *conn)
560{
561 if(conn->mech != NULL && conn->mech->end)
562 conn->mech->end(conn->app_data);
563 free(conn->app_data);
564 conn->app_data = NULL;
565 if(conn->in_buffer.data) {
566 free(conn->in_buffer.data);
567 conn->in_buffer.data = NULL;
568 conn->in_buffer.size = 0;
569 conn->in_buffer.index = 0;
570 /* FIXME: Is this really needed? */
571 conn->in_buffer.eof_flag = 0;
572 }
573 conn->sec_complete = 0;
574 conn->data_prot = PROT_CLEAR;
575 conn->mech = NULL;
576}
577
578#endif /* HAVE_GSSAPI */
579
580#endif /* CURL_DISABLE_FTP */
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