mirror of
https://github.com/moparisthebest/curl
synced 2024-12-23 00:28:48 -05:00
4a5aa6682d
This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:
f871de0... build: make use of 76 lib/*.h renamed files
ffd8e12... build: rename 76 lib/*.h files
This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:
c087374... curl_setup.h: remove redundant include guard
This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:
13606bb... build: make use of 93 lib/*.c renamed files
5b6e792... build: rename 93 lib/*.c files
7d83dff... build: commit 13606bbfde
follow-up 1
Start of related discussion thread:
http://curl.haxx.se/mail/lib-2013-01/0012.html
Asking for confirmation on pushing this revertion commit:
http://curl.haxx.se/mail/lib-2013-01/0048.html
Confirmation summary:
http://curl.haxx.se/mail/lib-2013-01/0079.html
NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.
lib/curl_imap.h
lib/curl_smtp.h
605 lines
16 KiB
C
605 lines
16 KiB
C
/* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
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* use in Curl. His latest changes were done 2000-09-18.
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*
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* It has since been patched and modified a lot by Daniel Stenberg
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* <daniel@haxx.se> to make it better applied to curl conditions, and to make
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* it not use globals, pollute name space and more. This source code awaits a
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* rewrite to work around the paragraph 2 in the BSD licenses as explained
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* below.
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*
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* Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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*
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* Copyright (C) 2001 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE. */
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#include "setup.h"
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#ifndef CURL_DISABLE_FTP
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#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include "urldata.h"
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#include "curl_base64.h"
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#include "curl_memory.h"
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#include "krb4.h"
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#include "ftp.h"
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#include "sendf.h"
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#include "rawstr.h"
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#include "warnless.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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static const struct {
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enum protection_level level;
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const char *name;
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} level_names[] = {
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{ PROT_CLEAR, "clear" },
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{ PROT_SAFE, "safe" },
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{ PROT_CONFIDENTIAL, "confidential" },
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{ PROT_PRIVATE, "private" }
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};
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static enum protection_level
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name_to_level(const char *name)
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{
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int i;
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for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
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if(checkprefix(name, level_names[i].name))
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return level_names[i].level;
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return PROT_NONE;
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}
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/* Convert a protocol |level| to its char representation.
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We take an int to catch programming mistakes. */
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static char level_to_char(int level) {
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switch(level) {
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case PROT_CLEAR:
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return 'C';
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case PROT_SAFE:
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return 'S';
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case PROT_CONFIDENTIAL:
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return 'E';
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case PROT_PRIVATE:
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return 'P';
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case PROT_CMD:
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/* Fall through */
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default:
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/* Those 2 cases should not be reached! */
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break;
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}
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DEBUGASSERT(0);
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/* Default to the most secure alternative. */
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return 'P';
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}
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static const struct Curl_sec_client_mech * const mechs[] = {
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#if defined(HAVE_GSSAPI)
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&Curl_krb5_client_mech,
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#endif
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#if defined(HAVE_KRB4)
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&Curl_krb4_client_mech,
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#endif
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NULL
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};
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/* Send an FTP command defined by |message| and the optional arguments. The
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function returns the ftp_code. If an error occurs, -1 is returned. */
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static int ftp_send_command(struct connectdata *conn, const char *message, ...)
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{
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int ftp_code;
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ssize_t nread;
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va_list args;
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char print_buffer[50];
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va_start(args, message);
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vsnprintf(print_buffer, sizeof(print_buffer), message, args);
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va_end(args);
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if(Curl_ftpsendf(conn, print_buffer) != CURLE_OK) {
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ftp_code = -1;
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}
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else {
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if(Curl_GetFTPResponse(&nread, conn, &ftp_code) != CURLE_OK)
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ftp_code = -1;
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}
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(void)nread; /* Unused */
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return ftp_code;
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}
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/* Read |len| from the socket |fd| and store it in |to|. Return a CURLcode
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saying whether an error occurred or CURLE_OK if |len| was read. */
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static CURLcode
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socket_read(curl_socket_t fd, void *to, size_t len)
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{
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char *to_p = to;
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CURLcode code;
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ssize_t nread;
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while(len > 0) {
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code = Curl_read_plain(fd, to_p, len, &nread);
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if(code == CURLE_OK) {
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len -= nread;
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to_p += nread;
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}
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else {
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/* FIXME: We are doing a busy wait */
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if(code == CURLE_AGAIN)
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continue;
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return code;
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}
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}
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return CURLE_OK;
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}
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/* Write |len| bytes from the buffer |to| to the socket |fd|. Return a
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CURLcode saying whether an error occurred or CURLE_OK if |len| was
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written. */
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static CURLcode
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socket_write(struct connectdata *conn, curl_socket_t fd, const void *to,
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size_t len)
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{
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const char *to_p = to;
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CURLcode code;
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ssize_t written;
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while(len > 0) {
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code = Curl_write_plain(conn, fd, to_p, len, &written);
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if(code == CURLE_OK) {
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len -= written;
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to_p += written;
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}
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else {
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/* FIXME: We are doing a busy wait */
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if(code == CURLE_AGAIN)
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continue;
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return code;
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}
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}
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return CURLE_OK;
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}
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static CURLcode read_data(struct connectdata *conn,
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curl_socket_t fd,
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struct krb4buffer *buf)
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{
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int len;
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void* tmp;
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CURLcode ret;
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ret = socket_read(fd, &len, sizeof(len));
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if(ret != CURLE_OK)
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return ret;
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len = ntohl(len);
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tmp = realloc(buf->data, len);
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if(tmp == NULL)
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return CURLE_OUT_OF_MEMORY;
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buf->data = tmp;
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ret = socket_read(fd, buf->data, len);
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if(ret != CURLE_OK)
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return ret;
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buf->size = conn->mech->decode(conn->app_data, buf->data, len,
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conn->data_prot, conn);
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buf->index = 0;
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return CURLE_OK;
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}
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static size_t
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buffer_read(struct krb4buffer *buf, void *data, size_t len)
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{
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if(buf->size - buf->index < len)
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len = buf->size - buf->index;
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memcpy(data, (char*)buf->data + buf->index, len);
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buf->index += len;
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return len;
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}
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/* Matches Curl_recv signature */
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static ssize_t sec_recv(struct connectdata *conn, int sockindex,
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char *buffer, size_t len, CURLcode *err)
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{
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size_t bytes_read;
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size_t total_read = 0;
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curl_socket_t fd = conn->sock[sockindex];
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*err = CURLE_OK;
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/* Handle clear text response. */
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if(conn->sec_complete == 0 || conn->data_prot == PROT_CLEAR)
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return read(fd, buffer, len);
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if(conn->in_buffer.eof_flag) {
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conn->in_buffer.eof_flag = 0;
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return 0;
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}
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bytes_read = buffer_read(&conn->in_buffer, buffer, len);
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len -= bytes_read;
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total_read += bytes_read;
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buffer += bytes_read;
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while(len > 0) {
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if(read_data(conn, fd, &conn->in_buffer) != CURLE_OK)
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return -1;
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if(conn->in_buffer.size == 0) {
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if(bytes_read > 0)
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conn->in_buffer.eof_flag = 1;
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return bytes_read;
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}
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bytes_read = buffer_read(&conn->in_buffer, buffer, len);
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len -= bytes_read;
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total_read += bytes_read;
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buffer += bytes_read;
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}
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/* FIXME: Check for overflow */
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return total_read;
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}
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/* Send |length| bytes from |from| to the |fd| socket taking care of encoding
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and negociating with the server. |from| can be NULL. */
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/* FIXME: We don't check for errors nor report any! */
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static void do_sec_send(struct connectdata *conn, curl_socket_t fd,
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const char *from, int length)
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{
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int bytes, htonl_bytes; /* 32-bit integers for htonl */
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char *buffer = NULL;
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char *cmd_buffer;
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size_t cmd_size = 0;
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CURLcode error;
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enum protection_level prot_level = conn->data_prot;
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bool iscmd = (prot_level == PROT_CMD)?TRUE:FALSE;
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DEBUGASSERT(prot_level > PROT_NONE && prot_level < PROT_LAST);
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if(iscmd) {
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if(!strncmp(from, "PASS ", 5) || !strncmp(from, "ACCT ", 5))
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prot_level = PROT_PRIVATE;
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else
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prot_level = conn->command_prot;
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}
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bytes = conn->mech->encode(conn->app_data, from, length, prot_level,
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(void**)&buffer, conn);
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if(!buffer || bytes <= 0)
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return; /* error */
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if(iscmd) {
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error = Curl_base64_encode(conn->data, buffer, curlx_sitouz(bytes),
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&cmd_buffer, &cmd_size);
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if(error) {
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free(buffer);
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return; /* error */
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}
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if(cmd_size > 0) {
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static const char *enc = "ENC ";
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static const char *mic = "MIC ";
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if(prot_level == PROT_PRIVATE)
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socket_write(conn, fd, enc, 4);
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else
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socket_write(conn, fd, mic, 4);
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socket_write(conn, fd, cmd_buffer, cmd_size);
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socket_write(conn, fd, "\r\n", 2);
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infof(conn->data, "Send: %s%s\n", prot_level == PROT_PRIVATE?enc:mic,
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cmd_buffer);
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free(cmd_buffer);
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}
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}
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else {
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htonl_bytes = htonl(bytes);
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socket_write(conn, fd, &htonl_bytes, sizeof(htonl_bytes));
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socket_write(conn, fd, buffer, curlx_sitouz(bytes));
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}
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free(buffer);
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}
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static ssize_t sec_write(struct connectdata *conn, curl_socket_t fd,
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const char *buffer, size_t length)
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{
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/* FIXME: Check for overflow */
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ssize_t tx = 0, len = conn->buffer_size;
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len -= conn->mech->overhead(conn->app_data, conn->data_prot,
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curlx_sztosi(len));
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if(len <= 0)
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len = length;
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while(length) {
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if(len >= 0 || length < (size_t)len) {
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/* FIXME: Check for overflow. */
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len = length;
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}
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do_sec_send(conn, fd, buffer, curlx_sztosi(len));
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length -= len;
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buffer += len;
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tx += len;
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}
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return tx;
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}
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/* Matches Curl_send signature */
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static ssize_t sec_send(struct connectdata *conn, int sockindex,
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const void *buffer, size_t len, CURLcode *err)
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{
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curl_socket_t fd = conn->sock[sockindex];
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*err = CURLE_OK;
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return sec_write(conn, fd, buffer, len);
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}
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int Curl_sec_read_msg(struct connectdata *conn, char *buffer,
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enum protection_level level)
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{
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/* decoded_len should be size_t or ssize_t but conn->mech->decode returns an
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int */
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int decoded_len;
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char *buf;
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int ret_code;
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size_t decoded_sz = 0;
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CURLcode error;
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DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
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error = Curl_base64_decode(buffer + 4, (unsigned char **)&buf, &decoded_sz);
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if(error || decoded_sz == 0)
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return -1;
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if(decoded_sz > (size_t)INT_MAX) {
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free(buf);
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return -1;
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}
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decoded_len = curlx_uztosi(decoded_sz);
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decoded_len = conn->mech->decode(conn->app_data, buf, decoded_len,
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level, conn);
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if(decoded_len <= 0) {
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free(buf);
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return -1;
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}
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if(conn->data->set.verbose) {
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buf[decoded_len] = '\n';
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Curl_debug(conn->data, CURLINFO_HEADER_IN, buf, decoded_len + 1, conn);
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}
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buf[decoded_len] = '\0';
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DEBUGASSERT(decoded_len > 3);
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if(buf[3] == '-')
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ret_code = 0;
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else {
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/* Check for error? */
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sscanf(buf, "%d", &ret_code);
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}
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if(buf[decoded_len - 1] == '\n')
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buf[decoded_len - 1] = '\0';
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/* FIXME: Is |buffer| length always greater than |decoded_len|? */
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strcpy(buffer, buf);
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free(buf);
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return ret_code;
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}
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/* FIXME: The error code returned here is never checked. */
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static int sec_set_protection_level(struct connectdata *conn)
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{
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int code;
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char* pbsz;
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static unsigned int buffer_size = 1 << 20; /* 1048576 */
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enum protection_level level = conn->request_data_prot;
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DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
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if(!conn->sec_complete) {
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infof(conn->data, "Trying to change the protection level after the"
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"completion of the data exchange.\n");
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return -1;
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}
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/* Bail out if we try to set up the same level */
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if(conn->data_prot == level)
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return 0;
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if(level) {
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code = ftp_send_command(conn, "PBSZ %u", buffer_size);
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if(code < 0)
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return -1;
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if(code/100 != 2) {
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failf(conn->data, "Failed to set the protection's buffer size.");
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return -1;
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}
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conn->buffer_size = buffer_size;
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pbsz = strstr(conn->data->state.buffer, "PBSZ=");
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if(pbsz) {
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/* FIXME: Checks for errors in sscanf? */
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sscanf(pbsz, "PBSZ=%u", &buffer_size);
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if(buffer_size < conn->buffer_size)
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conn->buffer_size = buffer_size;
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}
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}
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/* Now try to negiociate the protection level. */
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code = ftp_send_command(conn, "PROT %c", level_to_char(level));
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if(code < 0)
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return -1;
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if(code/100 != 2) {
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failf(conn->data, "Failed to set the protection level.");
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return -1;
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}
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conn->data_prot = level;
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if(level == PROT_PRIVATE)
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conn->command_prot = level;
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return 0;
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}
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int
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Curl_sec_request_prot(struct connectdata *conn, const char *level)
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{
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enum protection_level l = name_to_level(level);
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if(l == PROT_NONE)
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return -1;
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DEBUGASSERT(l > PROT_NONE && l < PROT_LAST);
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conn->request_data_prot = l;
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return 0;
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}
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static CURLcode choose_mech(struct connectdata *conn)
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{
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int ret;
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struct SessionHandle *data = conn->data;
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const struct Curl_sec_client_mech * const *mech;
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void *tmp_allocation;
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const char *mech_name;
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for(mech = mechs; (*mech); ++mech) {
|
|
mech_name = (*mech)->name;
|
|
/* We have no mechanism with a NULL name but keep this check */
|
|
DEBUGASSERT(mech_name != NULL);
|
|
if(mech_name == NULL) {
|
|
infof(data, "Skipping mechanism with empty name (%p)\n", mech);
|
|
continue;
|
|
}
|
|
tmp_allocation = realloc(conn->app_data, (*mech)->size);
|
|
if(tmp_allocation == NULL) {
|
|
failf(data, "Failed realloc of size %u", (*mech)->size);
|
|
mech = NULL;
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
conn->app_data = tmp_allocation;
|
|
|
|
if((*mech)->init) {
|
|
ret = (*mech)->init(conn->app_data);
|
|
if(ret != 0) {
|
|
infof(data, "Failed initialization for %s. Skipping it.\n", mech_name);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
infof(data, "Trying mechanism %s...\n", mech_name);
|
|
ret = ftp_send_command(conn, "AUTH %s", mech_name);
|
|
if(ret < 0)
|
|
/* FIXME: This error is too generic but it is OK for now. */
|
|
return CURLE_COULDNT_CONNECT;
|
|
|
|
if(ret/100 != 3) {
|
|
switch(ret) {
|
|
case 504:
|
|
infof(data, "Mechanism %s is not supported by the server (server "
|
|
"returned ftp code: 504).\n", mech_name);
|
|
break;
|
|
case 534:
|
|
infof(data, "Mechanism %s was rejected by the server (server returned "
|
|
"ftp code: 534).\n", mech_name);
|
|
break;
|
|
default:
|
|
if(ret/100 == 5) {
|
|
infof(data, "server does not support the security extensions\n");
|
|
return CURLE_USE_SSL_FAILED;
|
|
}
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* Authenticate */
|
|
ret = (*mech)->auth(conn->app_data, conn);
|
|
|
|
if(ret == AUTH_CONTINUE)
|
|
continue;
|
|
else if(ret != AUTH_OK) {
|
|
/* Mechanism has dumped the error to stderr, don't error here. */
|
|
return -1;
|
|
}
|
|
DEBUGASSERT(ret == AUTH_OK);
|
|
|
|
conn->mech = *mech;
|
|
conn->sec_complete = 1;
|
|
conn->recv[FIRSTSOCKET] = sec_recv;
|
|
conn->send[FIRSTSOCKET] = sec_send;
|
|
conn->recv[SECONDARYSOCKET] = sec_recv;
|
|
conn->send[SECONDARYSOCKET] = sec_send;
|
|
conn->command_prot = PROT_SAFE;
|
|
/* Set the requested protection level */
|
|
/* BLOCKING */
|
|
(void)sec_set_protection_level(conn);
|
|
break;
|
|
}
|
|
|
|
return mech != NULL ? CURLE_OK : CURLE_FAILED_INIT;
|
|
}
|
|
|
|
CURLcode
|
|
Curl_sec_login(struct connectdata *conn)
|
|
{
|
|
return choose_mech(conn);
|
|
}
|
|
|
|
|
|
void
|
|
Curl_sec_end(struct connectdata *conn)
|
|
{
|
|
if(conn->mech != NULL && conn->mech->end)
|
|
conn->mech->end(conn->app_data);
|
|
if(conn->app_data) {
|
|
free(conn->app_data);
|
|
conn->app_data = NULL;
|
|
}
|
|
if(conn->in_buffer.data) {
|
|
free(conn->in_buffer.data);
|
|
conn->in_buffer.data = NULL;
|
|
conn->in_buffer.size = 0;
|
|
conn->in_buffer.index = 0;
|
|
/* FIXME: Is this really needed? */
|
|
conn->in_buffer.eof_flag = 0;
|
|
}
|
|
conn->sec_complete = 0;
|
|
conn->data_prot = PROT_CLEAR;
|
|
conn->mech = NULL;
|
|
}
|
|
|
|
#endif /* HAVE_KRB4 || HAVE_GSSAPI */
|
|
|
|
#endif /* CURL_DISABLE_FTP */
|