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-rw-r--r--Utilities/cmcurl/security.c493
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diff --git a/Utilities/cmcurl/security.c b/Utilities/cmcurl/security.c
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+/* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
+ * use in Curl. His latest changes were done 2000-09-18.
+ *
+ * It has since been patched and modified a lot by Daniel Stenberg
+ * <daniel@haxx.se> to make it better applied to curl conditions, and to make
+ * it not use globals, pollute name space and more. This source code awaits a
+ * rewrite to work around the paragraph 2 in the BSD licenses as explained
+ * below.
+ *
+ * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE. */
+
+#include "setup.h"
+
+#ifndef CURL_DISABLE_FTP
+#ifdef HAVE_KRB4
+
+#define _MPRINTF_REPLACE /* we want curl-functions instead of native ones */
+#include <curl/mprintf.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <netdb.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "urldata.h"
+#include "krb4.h"
+#include "base64.h"
+#include "sendf.h"
+#include "ftp.h"
+#include "memory.h"
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+
+static const struct {
+ enum protection_level level;
+ const char *name;
+} level_names[] = {
+ { prot_clear, "clear" },
+ { prot_safe, "safe" },
+ { prot_confidential, "confidential" },
+ { prot_private, "private" }
+};
+
+static enum protection_level
+name_to_level(const char *name)
+{
+ int i;
+ for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
+ if(curl_strnequal(level_names[i].name, name, strlen(name)))
+ return level_names[i].level;
+ return (enum protection_level)-1;
+}
+
+static const struct Curl_sec_client_mech * const mechs[] = {
+#ifdef KRB5
+ /* not supported */
+#endif
+#ifdef HAVE_KRB4
+ &Curl_krb4_client_mech,
+#endif
+ NULL
+};
+
+int
+Curl_sec_getc(struct connectdata *conn, FILE *F)
+{
+ if(conn->sec_complete && conn->data_prot) {
+ char c;
+ if(Curl_sec_read(conn, fileno(F), &c, 1) <= 0)
+ return EOF;
+ return c;
+ }
+ else
+ return getc(F);
+}
+
+static int
+block_read(int fd, void *buf, size_t len)
+{
+ unsigned char *p = buf;
+ int b;
+ while(len) {
+ b = read(fd, p, len);
+ if (b == 0)
+ return 0;
+ else if (b < 0)
+ return -1;
+ len -= b;
+ p += b;
+ }
+ return p - (unsigned char*)buf;
+}
+
+static int
+block_write(int fd, void *buf, size_t len)
+{
+ unsigned char *p = buf;
+ int b;
+ while(len) {
+ b = write(fd, p, len);
+ if(b < 0)
+ return -1;
+ len -= b;
+ p += b;
+ }
+ return p - (unsigned char*)buf;
+}
+
+static int
+sec_get_data(struct connectdata *conn,
+ int fd, struct krb4buffer *buf)
+{
+ int len;
+ int b;
+
+ b = block_read(fd, &len, sizeof(len));
+ if (b == 0)
+ return 0;
+ else if (b < 0)
+ return -1;
+ len = ntohl(len);
+ buf->data = realloc(buf->data, len);
+ b = block_read(fd, buf->data, len);
+ if (b == 0)
+ return 0;
+ else if (b < 0)
+ return -1;
+ buf->size = (conn->mech->decode)(conn->app_data, buf->data, len,
+ conn->data_prot, conn);
+ buf->index = 0;
+ return 0;
+}
+
+static size_t
+buffer_read(struct krb4buffer *buf, void *data, size_t len)
+{
+ len = min(len, buf->size - buf->index);
+ memcpy(data, (char*)buf->data + buf->index, len);
+ buf->index += len;
+ return len;
+}
+
+static size_t
+buffer_write(struct krb4buffer *buf, void *data, size_t len)
+{
+ if(buf->index + len > buf->size) {
+ void *tmp;
+ if(buf->data == NULL)
+ tmp = malloc(1024);
+ else
+ tmp = realloc(buf->data, buf->index + len);
+ if(tmp == NULL)
+ return -1;
+ buf->data = tmp;
+ buf->size = buf->index + len;
+ }
+ memcpy((char*)buf->data + buf->index, data, len);
+ buf->index += len;
+ return len;
+}
+
+int
+Curl_sec_read(struct connectdata *conn, int fd, void *buffer, int length)
+{
+ size_t len;
+ int rx = 0;
+
+ if(conn->sec_complete == 0 || conn->data_prot == 0)
+ return read(fd, buffer, length);
+
+ if(conn->in_buffer.eof_flag){
+ conn->in_buffer.eof_flag = 0;
+ return 0;
+ }
+
+ len = buffer_read(&conn->in_buffer, buffer, length);
+ length -= len;
+ rx += len;
+ buffer = (char*)buffer + len;
+
+ while(length) {
+ if(sec_get_data(conn, fd, &conn->in_buffer) < 0)
+ return -1;
+ if(conn->in_buffer.size == 0) {
+ if(rx)
+ conn->in_buffer.eof_flag = 1;
+ return rx;
+ }
+ len = buffer_read(&conn->in_buffer, buffer, length);
+ length -= len;
+ rx += len;
+ buffer = (char*)buffer + len;
+ }
+ return rx;
+}
+
+static int
+sec_send(struct connectdata *conn, int fd, char *from, int length)
+{
+ int bytes;
+ void *buf;
+ bytes = (conn->mech->encode)(conn->app_data, from, length, conn->data_prot,
+ &buf, conn);
+ bytes = htonl(bytes);
+ block_write(fd, &bytes, sizeof(bytes));
+ block_write(fd, buf, ntohl(bytes));
+ free(buf);
+ return length;
+}
+
+int
+Curl_sec_fflush_fd(struct connectdata *conn, int fd)
+{
+ if(conn->data_prot != prot_clear) {
+ if(conn->out_buffer.index > 0){
+ Curl_sec_write(conn, fd,
+ conn->out_buffer.data, conn->out_buffer.index);
+ conn->out_buffer.index = 0;
+ }
+ sec_send(conn, fd, NULL, 0);
+ }
+ return 0;
+}
+
+int
+Curl_sec_write(struct connectdata *conn, int fd, char *buffer, int length)
+{
+ int len = conn->buffer_size;
+ int tx = 0;
+
+ if(conn->data_prot == prot_clear)
+ return write(fd, buffer, length);
+
+ len -= (conn->mech->overhead)(conn->app_data, conn->data_prot, len);
+ while(length){
+ if(length < len)
+ len = length;
+ sec_send(conn, fd, buffer, len);
+ length -= len;
+ buffer += len;
+ tx += len;
+ }
+ return tx;
+}
+
+ssize_t
+Curl_sec_send(struct connectdata *conn, int num, char *buffer, int length)
+{
+ curl_socket_t fd = conn->sock[num];
+ return (ssize_t)Curl_sec_write(conn, fd, buffer, length);
+}
+
+int
+Curl_sec_putc(struct connectdata *conn, int c, FILE *F)
+{
+ char ch = c;
+ if(conn->data_prot == prot_clear)
+ return putc(c, F);
+
+ buffer_write(&conn->out_buffer, &ch, 1);
+ if(c == '\n' || conn->out_buffer.index >= 1024 /* XXX */) {
+ Curl_sec_write(conn, fileno(F), conn->out_buffer.data,
+ conn->out_buffer.index);
+ conn->out_buffer.index = 0;
+ }
+ return c;
+}
+
+int
+Curl_sec_read_msg(struct connectdata *conn, char *s, int level)
+{
+ int len;
+ unsigned char *buf;
+ int code;
+
+ len = Curl_base64_decode(s + 4, &buf); /* XXX */
+ if(len > 0)
+ len = (conn->mech->decode)(conn->app_data, buf, len, level, conn);
+ else
+ return -1;
+
+ if(len < 0) {
+ free(buf);
+ return -1;
+ }
+
+ buf[len] = '\0';
+
+ if(buf[3] == '-')
+ code = 0;
+ else
+ sscanf((char *)buf, "%d", &code);
+ if(buf[len-1] == '\n')
+ buf[len-1] = '\0';
+ strcpy(s, (char *)buf);
+ free(buf);
+ return code;
+}
+
+enum protection_level
+Curl_set_command_prot(struct connectdata *conn, enum protection_level level)
+{
+ enum protection_level old = conn->command_prot;
+ conn->command_prot = level;
+ return old;
+}
+
+static int
+sec_prot_internal(struct connectdata *conn, int level)
+{
+ char *p;
+ unsigned int s = 1048576;
+ ssize_t nread;
+
+ if(!conn->sec_complete){
+ infof(conn->data, "No security data exchange has taken place.\n");
+ return -1;
+ }
+
+ if(level){
+ int code;
+ if(Curl_ftpsendf(conn, "PBSZ %u", s))
+ return -1;
+
+ if(Curl_GetFTPResponse(&nread, conn, &code))
+ return -1;
+
+ if(code/100 != '2'){
+ failf(conn->data, "Failed to set protection buffer size.");
+ return -1;
+ }
+ conn->buffer_size = s;
+
+ p = strstr(conn->data->state.buffer, "PBSZ=");
+ if(p)
+ sscanf(p, "PBSZ=%u", &s);
+ if(s < conn->buffer_size)
+ conn->buffer_size = s;
+ }
+
+ if(Curl_ftpsendf(conn, "PROT %c", level["CSEP"]))
+ return -1;
+
+ if(Curl_GetFTPResponse(&nread, conn, NULL))
+ return -1;
+
+ if(conn->data->state.buffer[0] != '2'){
+ failf(conn->data, "Failed to set protection level.");
+ return -1;
+ }
+
+ conn->data_prot = (enum protection_level)level;
+ return 0;
+}
+
+void
+Curl_sec_set_protection_level(struct connectdata *conn)
+{
+ if(conn->sec_complete && conn->data_prot != conn->request_data_prot)
+ sec_prot_internal(conn, conn->request_data_prot);
+}
+
+
+int
+Curl_sec_request_prot(struct connectdata *conn, const char *level)
+{
+ int l = name_to_level(level);
+ if(l == -1)
+ return -1;
+ conn->request_data_prot = (enum protection_level)l;
+ return 0;
+}
+
+int
+Curl_sec_login(struct connectdata *conn)
+{
+ int ret;
+ const struct Curl_sec_client_mech * const *m;
+ ssize_t nread;
+ struct SessionHandle *data=conn->data;
+ int ftpcode;
+
+ for(m = mechs; *m && (*m)->name; m++) {
+ void *tmp;
+
+ tmp = realloc(conn->app_data, (*m)->size);
+ if (tmp == NULL) {
+ failf (data, "realloc %u failed", (*m)->size);
+ return -1;
+ }
+ conn->app_data = tmp;
+
+ if((*m)->init && (*(*m)->init)(conn->app_data) != 0) {
+ infof(data, "Skipping %s...\n", (*m)->name);
+ continue;
+ }
+ infof(data, "Trying %s...\n", (*m)->name);
+
+ if(Curl_ftpsendf(conn, "AUTH %s", (*m)->name))
+ return -1;
+
+ if(Curl_GetFTPResponse(&nread, conn, &ftpcode))
+ return -1;
+
+ if(conn->data->state.buffer[0] != '3'){
+ switch(ftpcode) {
+ case 504:
+ infof(data,
+ "%s is not supported by the server.\n", (*m)->name);
+ break;
+ case 534:
+ infof(data, "%s rejected as security mechanism.\n", (*m)->name);
+ break;
+ default:
+ if(conn->data->state.buffer[0] == '5') {
+ infof(data, "The server doesn't support the FTP "
+ "security extensions.\n");
+ return -1;
+ }
+ break;
+ }
+ continue;
+ }
+
+ ret = (*(*m)->auth)(conn->app_data, conn);
+
+ if(ret == AUTH_CONTINUE)
+ continue;
+ else if(ret != AUTH_OK){
+ /* mechanism is supposed to output error string */
+ return -1;
+ }
+ conn->mech = *m;
+ conn->sec_complete = 1;
+ conn->command_prot = prot_safe;
+ break;
+ }
+
+ return *m == NULL;
+}
+
+void
+Curl_sec_end(struct connectdata *conn)
+{
+ if (conn->mech != NULL) {
+ if(conn->mech->end)
+ (conn->mech->end)(conn->app_data);
+ memset(conn->app_data, 0, conn->mech->size);
+ free(conn->app_data);
+ conn->app_data = NULL;
+ }
+ conn->sec_complete = 0;
+ conn->data_prot = (enum protection_level)0;
+ conn->mech=NULL;
+}
+
+#endif /* HAVE_KRB4 */
+#endif /* CURL_DISABLE_FTP */
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