add curl 7.16.0 to in tree libs

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3744 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/curl/lib/security.c

@@ -0,0 +1,486 @@
+/* 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 H<>gskolan
+ * (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;
+}
+
+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 */