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.
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
10 * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
11 * (Royal Institute of Technology, Stockholm, Sweden).
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
25 * 3. Neither the name of the Institute nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 #ifndef CURL_DISABLE_FTP
46 #define _MPRINTF_REPLACE /* we want curl-functions instead of native ones */
47 #include <curl/mprintf.h>
63 /* The last #include file should be: */
66 #define min(a, b) ((a) < (b) ? (a) : (b))
69 enum protection_level level;
72 { prot_clear, "clear" },
73 { prot_safe, "safe" },
74 { prot_confidential, "confidential" },
75 { prot_private, "private" }
78 static enum protection_level
79 name_to_level(const char *name)
82 for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
83 if(!strncasecmp(level_names[i].name, name, strlen(name)))
84 return level_names[i].level;
85 return (enum protection_level)-1;
88 static struct Curl_sec_client_mech *mechs[] = {
93 &Curl_krb4_client_mech,
99 Curl_sec_getc(struct connectdata *conn, FILE *F)
101 if(conn->sec_complete && conn->data_prot) {
103 if(Curl_sec_read(conn, fileno(F), &c, 1) <= 0)
112 block_read(int fd, void *buf, size_t len)
114 unsigned char *p = buf;
117 b = read(fd, p, len);
125 return p - (unsigned char*)buf;
129 block_write(int fd, void *buf, size_t len)
131 unsigned char *p = buf;
134 b = write(fd, p, len);
140 return p - (unsigned char*)buf;
144 sec_get_data(struct connectdata *conn,
145 int fd, struct krb4buffer *buf)
150 b = block_read(fd, &len, sizeof(len));
156 buf->data = realloc(buf->data, len);
157 b = block_read(fd, buf->data, len);
162 buf->size = (conn->mech->decode)(conn->app_data, buf->data, len,
163 conn->data_prot, conn);
169 buffer_read(struct krb4buffer *buf, void *data, size_t len)
171 len = min(len, buf->size - buf->index);
172 memcpy(data, (char*)buf->data + buf->index, len);
178 buffer_write(struct krb4buffer *buf, void *data, size_t len)
180 if(buf->index + len > buf->size) {
182 if(buf->data == NULL)
185 tmp = realloc(buf->data, buf->index + len);
189 buf->size = buf->index + len;
191 memcpy((char*)buf->data + buf->index, data, len);
197 Curl_sec_read(struct connectdata *conn, int fd, void *buffer, int length)
202 if(conn->sec_complete == 0 || conn->data_prot == 0)
203 return read(fd, buffer, length);
205 if(conn->in_buffer.eof_flag){
206 conn->in_buffer.eof_flag = 0;
210 len = buffer_read(&conn->in_buffer, buffer, length);
213 buffer = (char*)buffer + len;
216 if(sec_get_data(conn, fd, &conn->in_buffer) < 0)
218 if(conn->in_buffer.size == 0) {
220 conn->in_buffer.eof_flag = 1;
223 len = buffer_read(&conn->in_buffer, buffer, length);
226 buffer = (char*)buffer + len;
232 sec_send(struct connectdata *conn, int fd, char *from, int length)
236 bytes = (conn->mech->encode)(conn->app_data, from, length, conn->data_prot,
238 bytes = htonl(bytes);
239 block_write(fd, &bytes, sizeof(bytes));
240 block_write(fd, buf, ntohl(bytes));
246 Curl_sec_fflush_fd(struct connectdata *conn, int fd)
248 if(conn->data_prot != prot_clear) {
249 if(conn->out_buffer.index > 0){
250 Curl_sec_write(conn, fd,
251 conn->out_buffer.data, conn->out_buffer.index);
252 conn->out_buffer.index = 0;
254 sec_send(conn, fd, NULL, 0);
260 Curl_sec_write(struct connectdata *conn, int fd, char *buffer, int length)
262 int len = conn->buffer_size;
265 if(conn->data_prot == prot_clear)
266 return write(fd, buffer, length);
268 len -= (conn->mech->overhead)(conn->app_data, conn->data_prot, len);
272 sec_send(conn, fd, buffer, len);
281 Curl_sec_putc(struct connectdata *conn, int c, FILE *F)
284 if(conn->data_prot == prot_clear)
287 buffer_write(&conn->out_buffer, &ch, 1);
288 if(c == '\n' || conn->out_buffer.index >= 1024 /* XXX */) {
289 Curl_sec_write(conn, fileno(F), conn->out_buffer.data,
290 conn->out_buffer.index);
291 conn->out_buffer.index = 0;
297 Curl_sec_read_msg(struct connectdata *conn, char *s, int level)
303 buf = malloc(strlen(s));
304 len = Curl_base64_decode(s + 4, buf); /* XXX */
306 len = (conn->mech->decode)(conn->app_data, buf, len, level, conn);
315 sscanf(buf, "%d", &code);
316 if(buf[len-1] == '\n')
323 enum protection_level
324 Curl_set_command_prot(struct connectdata *conn, enum protection_level level)
326 enum protection_level old = conn->command_prot;
327 conn->command_prot = level;
332 sec_prot_internal(struct connectdata *conn, int level)
335 unsigned int s = 1048576;
338 if(!conn->sec_complete){
339 infof(conn->data, "No security data exchange has taken place.\n");
345 if(Curl_ftpsendf(conn, "PBSZ %u", s))
348 if(Curl_GetFTPResponse(&nread, conn, &code))
352 failf(conn->data, "Failed to set protection buffer size.");
355 conn->buffer_size = s;
357 p = strstr(conn->data->state.buffer, "PBSZ=");
359 sscanf(p, "PBSZ=%u", &s);
360 if(s < conn->buffer_size)
361 conn->buffer_size = s;
364 if(Curl_ftpsendf(conn, "PROT %c", level["CSEP"]))
367 if(Curl_GetFTPResponse(&nread, conn, NULL))
370 if(conn->data->state.buffer[0] != '2'){
371 failf(conn->data, "Failed to set protection level.");
375 conn->data_prot = (enum protection_level)level;
380 Curl_sec_set_protection_level(struct connectdata *conn)
382 if(conn->sec_complete && conn->data_prot != conn->request_data_prot)
383 sec_prot_internal(conn, conn->request_data_prot);
388 Curl_sec_request_prot(struct connectdata *conn, const char *level)
390 int l = name_to_level(level);
393 conn->request_data_prot = (enum protection_level)l;
398 Curl_sec_login(struct connectdata *conn)
401 struct Curl_sec_client_mech **m;
403 struct SessionHandle *data=conn->data;
406 for(m = mechs; *m && (*m)->name; m++) {
409 tmp = realloc(conn->app_data, (*m)->size);
411 failf (data, "realloc %u failed", (*m)->size);
414 conn->app_data = tmp;
416 if((*m)->init && (*(*m)->init)(conn->app_data) != 0) {
417 infof(data, "Skipping %s...\n", (*m)->name);
420 infof(data, "Trying %s...\n", (*m)->name);
422 if(Curl_ftpsendf(conn, "AUTH %s", (*m)->name))
425 if(Curl_GetFTPResponse(&nread, conn, &ftpcode))
428 if(conn->data->state.buffer[0] != '3'){
432 "%s is not supported by the server.\n", (*m)->name);
435 infof(data, "%s rejected as security mechanism.\n", (*m)->name);
438 if(conn->data->state.buffer[0] == '5') {
439 infof(data, "The server doesn't support the FTP "
440 "security extensions.\n");
448 ret = (*(*m)->auth)(conn->app_data, conn);
450 if(ret == AUTH_CONTINUE)
452 else if(ret != AUTH_OK){
453 /* mechanism is supposed to output error string */
457 conn->sec_complete = 1;
458 conn->command_prot = prot_safe;
466 Curl_sec_end(struct connectdata *conn)
468 if (conn->mech != NULL) {
470 (conn->mech->end)(conn->app_data);
471 memset(conn->app_data, 0, conn->mech->size);
472 free(conn->app_data);
473 conn->app_data = NULL;
475 conn->sec_complete = 0;
476 conn->data_prot = (enum protection_level)0;
480 #endif /* HAVE_KRB4 */
481 #endif /* CURL_DISABLE_FTP */