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>
62 /* The last #include file should be: */
67 #define min(a, b) ((a) < (b) ? (a) : (b))
70 enum protection_level level;
73 { prot_clear, "clear" },
74 { prot_safe, "safe" },
75 { prot_confidential, "confidential" },
76 { prot_private, "private" }
79 static enum protection_level
80 name_to_level(const char *name)
83 for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
84 if(!strncasecmp(level_names[i].name, name, strlen(name)))
85 return level_names[i].level;
86 return (enum protection_level)-1;
89 static struct Curl_sec_client_mech *mechs[] = {
94 &Curl_krb4_client_mech,
100 Curl_sec_getc(struct connectdata *conn, FILE *F)
102 if(conn->sec_complete && conn->data_prot) {
104 if(Curl_sec_read(conn, fileno(F), &c, 1) <= 0)
113 block_read(int fd, void *buf, size_t len)
115 unsigned char *p = buf;
118 b = read(fd, p, len);
126 return p - (unsigned char*)buf;
130 block_write(int fd, void *buf, size_t len)
132 unsigned char *p = buf;
135 b = write(fd, p, len);
141 return p - (unsigned char*)buf;
145 sec_get_data(struct connectdata *conn,
146 int fd, struct krb4buffer *buf)
151 b = block_read(fd, &len, sizeof(len));
157 buf->data = realloc(buf->data, len);
158 b = block_read(fd, buf->data, len);
163 buf->size = (conn->mech->decode)(conn->app_data, buf->data, len,
164 conn->data_prot, conn);
170 buffer_read(struct krb4buffer *buf, void *data, size_t len)
172 len = min(len, buf->size - buf->index);
173 memcpy(data, (char*)buf->data + buf->index, len);
179 buffer_write(struct krb4buffer *buf, void *data, size_t len)
181 if(buf->index + len > buf->size) {
183 if(buf->data == NULL)
186 tmp = realloc(buf->data, buf->index + len);
190 buf->size = buf->index + len;
192 memcpy((char*)buf->data + buf->index, data, len);
198 Curl_sec_read(struct connectdata *conn, int fd, void *buffer, int length)
203 if(conn->sec_complete == 0 || conn->data_prot == 0)
204 return read(fd, buffer, length);
206 if(conn->in_buffer.eof_flag){
207 conn->in_buffer.eof_flag = 0;
211 len = buffer_read(&conn->in_buffer, buffer, length);
214 buffer = (char*)buffer + len;
217 if(sec_get_data(conn, fd, &conn->in_buffer) < 0)
219 if(conn->in_buffer.size == 0) {
221 conn->in_buffer.eof_flag = 1;
224 len = buffer_read(&conn->in_buffer, buffer, length);
227 buffer = (char*)buffer + len;
233 sec_send(struct connectdata *conn, int fd, char *from, int length)
237 bytes = (conn->mech->encode)(conn->app_data, from, length, conn->data_prot,
239 bytes = htonl(bytes);
240 block_write(fd, &bytes, sizeof(bytes));
241 block_write(fd, buf, ntohl(bytes));
247 Curl_sec_fflush_fd(struct connectdata *conn, int fd)
249 if(conn->data_prot != prot_clear) {
250 if(conn->out_buffer.index > 0){
251 Curl_sec_write(conn, fd,
252 conn->out_buffer.data, conn->out_buffer.index);
253 conn->out_buffer.index = 0;
255 sec_send(conn, fd, NULL, 0);
261 Curl_sec_write(struct connectdata *conn, int fd, char *buffer, int length)
263 int len = conn->buffer_size;
266 if(conn->data_prot == prot_clear)
267 return write(fd, buffer, length);
269 len -= (conn->mech->overhead)(conn->app_data, conn->data_prot, len);
273 sec_send(conn, fd, buffer, len);
282 Curl_sec_putc(struct connectdata *conn, int c, FILE *F)
285 if(conn->data_prot == prot_clear)
288 buffer_write(&conn->out_buffer, &ch, 1);
289 if(c == '\n' || conn->out_buffer.index >= 1024 /* XXX */) {
290 Curl_sec_write(conn, fileno(F), conn->out_buffer.data,
291 conn->out_buffer.index);
292 conn->out_buffer.index = 0;
298 Curl_sec_read_msg(struct connectdata *conn, char *s, int level)
304 buf = malloc(strlen(s));
305 len = Curl_base64_decode(s + 4, buf); /* XXX */
307 len = (conn->mech->decode)(conn->app_data, buf, len, level, conn);
316 sscanf(buf, "%d", &code);
317 if(buf[len-1] == '\n')
324 enum protection_level
325 Curl_set_command_prot(struct connectdata *conn, enum protection_level level)
327 enum protection_level old = conn->command_prot;
328 conn->command_prot = level;
333 sec_prot_internal(struct connectdata *conn, int level)
336 unsigned int s = 1048576;
339 if(!conn->sec_complete){
340 infof(conn->data, "No security data exchange has taken place.\n");
346 if(Curl_ftpsendf(conn, "PBSZ %u", s))
349 if(Curl_GetFTPResponse(&nread, conn, &code))
353 failf(conn->data, "Failed to set protection buffer size.");
356 conn->buffer_size = s;
358 p = strstr(conn->data->state.buffer, "PBSZ=");
360 sscanf(p, "PBSZ=%u", &s);
361 if(s < conn->buffer_size)
362 conn->buffer_size = s;
365 if(Curl_ftpsendf(conn, "PROT %c", level["CSEP"]))
368 if(Curl_GetFTPResponse(&nread, conn, NULL))
371 if(conn->data->state.buffer[0] != '2'){
372 failf(conn->data, "Failed to set protection level.");
376 conn->data_prot = (enum protection_level)level;
381 Curl_sec_set_protection_level(struct connectdata *conn)
383 if(conn->sec_complete && conn->data_prot != conn->request_data_prot)
384 sec_prot_internal(conn, conn->request_data_prot);
389 Curl_sec_request_prot(struct connectdata *conn, const char *level)
391 int l = name_to_level(level);
394 conn->request_data_prot = (enum protection_level)l;
399 Curl_sec_login(struct connectdata *conn)
402 struct Curl_sec_client_mech **m;
404 struct SessionHandle *data=conn->data;
407 for(m = mechs; *m && (*m)->name; m++) {
410 tmp = realloc(conn->app_data, (*m)->size);
412 failf (data, "realloc %u failed", (*m)->size);
415 conn->app_data = tmp;
417 if((*m)->init && (*(*m)->init)(conn->app_data) != 0) {
418 infof(data, "Skipping %s...\n", (*m)->name);
421 infof(data, "Trying %s...\n", (*m)->name);
423 if(Curl_ftpsendf(conn, "AUTH %s", (*m)->name))
426 if(Curl_GetFTPResponse(&nread, conn, &ftpcode))
429 if(conn->data->state.buffer[0] != '3'){
433 "%s is not supported by the server.\n", (*m)->name);
436 infof(data, "%s rejected as security mechanism.\n", (*m)->name);
439 if(conn->data->state.buffer[0] == '5') {
440 infof(data, "The server doesn't support the FTP "
441 "security extensions.\n");
449 ret = (*(*m)->auth)(conn->app_data, conn);
451 if(ret == AUTH_CONTINUE)
453 else if(ret != AUTH_OK){
454 /* mechanism is supposed to output error string */
458 conn->sec_complete = 1;
459 conn->command_prot = prot_safe;
467 Curl_sec_end(struct connectdata *conn)
469 if (conn->mech != NULL) {
471 (conn->mech->end)(conn->app_data);
472 memset(conn->app_data, 0, conn->mech->size);
473 free(conn->app_data);
474 conn->app_data = NULL;
476 conn->sec_complete = 0;
477 conn->data_prot = (enum protection_level)0;
481 #endif /* HAVE_KRB4 */
482 #endif /* CURL_DISABLE_FTP */