diff options
Diffstat (limited to 'libcurl/src/lib/security.c')
| -rw-r--r-- | libcurl/src/lib/security.c | 597 |
1 files changed, 0 insertions, 597 deletions
diff --git a/libcurl/src/lib/security.c b/libcurl/src/lib/security.c deleted file mode 100644 index 10cb73c..0000000 --- a/libcurl/src/lib/security.c +++ /dev/null @@ -1,597 +0,0 @@ -/* 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).
- *
- * Copyright (C) 2001 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * 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 "curl_setup.h"
-
-#ifndef CURL_DISABLE_FTP
-#ifdef HAVE_GSSAPI
-
-#ifdef HAVE_NETDB_H
-#include <netdb.h>
-#endif
-
-#ifdef HAVE_LIMITS_H
-#include <limits.h>
-#endif
-
-#include "urldata.h"
-#include "curl_base64.h"
-#include "curl_memory.h"
-#include "curl_sec.h"
-#include "ftp.h"
-#include "sendf.h"
-#include "rawstr.h"
-#include "warnless.h"
-
-/* The last #include file should be: */
-#include "memdebug.h"
-
-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(checkprefix(name, level_names[i].name))
- return level_names[i].level;
- return PROT_NONE;
-}
-
-/* Convert a protocol |level| to its char representation.
- We take an int to catch programming mistakes. */
-static char level_to_char(int level) {
- switch(level) {
- case PROT_CLEAR:
- return 'C';
- case PROT_SAFE:
- return 'S';
- case PROT_CONFIDENTIAL:
- return 'E';
- case PROT_PRIVATE:
- return 'P';
- case PROT_CMD:
- /* Fall through */
- default:
- /* Those 2 cases should not be reached! */
- break;
- }
- DEBUGASSERT(0);
- /* Default to the most secure alternative. */
- return 'P';
-}
-
-static const struct Curl_sec_client_mech * const mechs[] = {
-#ifdef HAVE_GSSAPI
- &Curl_krb5_client_mech,
-#endif
- NULL
-};
-
-/* Send an FTP command defined by |message| and the optional arguments. The
- function returns the ftp_code. If an error occurs, -1 is returned. */
-static int ftp_send_command(struct connectdata *conn, const char *message, ...)
-{
- int ftp_code;
- ssize_t nread=0;
- va_list args;
- char print_buffer[50];
-
- va_start(args, message);
- vsnprintf(print_buffer, sizeof(print_buffer), message, args);
- va_end(args);
-
- if(Curl_ftpsendf(conn, print_buffer)) {
- ftp_code = -1;
- }
- else {
- if(Curl_GetFTPResponse(&nread, conn, &ftp_code))
- ftp_code = -1;
- }
-
- (void)nread; /* Unused */
- return ftp_code;
-}
-
-/* Read |len| from the socket |fd| and store it in |to|. Return a CURLcode
- saying whether an error occurred or CURLE_OK if |len| was read. */
-static CURLcode
-socket_read(curl_socket_t fd, void *to, size_t len)
-{
- char *to_p = to;
- CURLcode result;
- ssize_t nread;
-
- while(len > 0) {
- result = Curl_read_plain(fd, to_p, len, &nread);
- if(!result) {
- len -= nread;
- to_p += nread;
- }
- else {
- /* FIXME: We are doing a busy wait */
- if(result == CURLE_AGAIN)
- continue;
- return result;
- }
- }
- return CURLE_OK;
-}
-
-
-/* Write |len| bytes from the buffer |to| to the socket |fd|. Return a
- CURLcode saying whether an error occurred or CURLE_OK if |len| was
- written. */
-static CURLcode
-socket_write(struct connectdata *conn, curl_socket_t fd, const void *to,
- size_t len)
-{
- const char *to_p = to;
- CURLcode result;
- ssize_t written;
-
- while(len > 0) {
- result = Curl_write_plain(conn, fd, to_p, len, &written);
- if(!result) {
- len -= written;
- to_p += written;
- }
- else {
- /* FIXME: We are doing a busy wait */
- if(result == CURLE_AGAIN)
- continue;
- return result;
- }
- }
- return CURLE_OK;
-}
-
-static CURLcode read_data(struct connectdata *conn,
- curl_socket_t fd,
- struct krb5buffer *buf)
-{
- int len;
- void* tmp;
- CURLcode result;
-
- result = socket_read(fd, &len, sizeof(len));
- if(result)
- return result;
-
- len = ntohl(len);
- tmp = realloc(buf->data, len);
- if(tmp == NULL)
- return CURLE_OUT_OF_MEMORY;
-
- buf->data = tmp;
- result = socket_read(fd, buf->data, len);
- if(result)
- return result;
- buf->size = conn->mech->decode(conn->app_data, buf->data, len,
- conn->data_prot, conn);
- buf->index = 0;
- return CURLE_OK;
-}
-
-static size_t
-buffer_read(struct krb5buffer *buf, void *data, size_t len)
-{
- if(buf->size - buf->index < len)
- len = buf->size - buf->index;
- memcpy(data, (char*)buf->data + buf->index, len);
- buf->index += len;
- return len;
-}
-
-/* Matches Curl_recv signature */
-static ssize_t sec_recv(struct connectdata *conn, int sockindex,
- char *buffer, size_t len, CURLcode *err)
-{
- size_t bytes_read;
- size_t total_read = 0;
- curl_socket_t fd = conn->sock[sockindex];
-
- *err = CURLE_OK;
-
- /* Handle clear text response. */
- if(conn->sec_complete == 0 || conn->data_prot == PROT_CLEAR)
- return read(fd, buffer, len);
-
- if(conn->in_buffer.eof_flag) {
- conn->in_buffer.eof_flag = 0;
- return 0;
- }
-
- bytes_read = buffer_read(&conn->in_buffer, buffer, len);
- len -= bytes_read;
- total_read += bytes_read;
- buffer += bytes_read;
-
- while(len > 0) {
- if(read_data(conn, fd, &conn->in_buffer))
- return -1;
- if(conn->in_buffer.size == 0) {
- if(bytes_read > 0)
- conn->in_buffer.eof_flag = 1;
- return bytes_read;
- }
- bytes_read = buffer_read(&conn->in_buffer, buffer, len);
- len -= bytes_read;
- total_read += bytes_read;
- buffer += bytes_read;
- }
- /* FIXME: Check for overflow */
- return total_read;
-}
-
-/* Send |length| bytes from |from| to the |fd| socket taking care of encoding
- and negociating with the server. |from| can be NULL. */
-/* FIXME: We don't check for errors nor report any! */
-static void do_sec_send(struct connectdata *conn, curl_socket_t fd,
- const char *from, int length)
-{
- int bytes, htonl_bytes; /* 32-bit integers for htonl */
- char *buffer = NULL;
- char *cmd_buffer;
- size_t cmd_size = 0;
- CURLcode error;
- enum protection_level prot_level = conn->data_prot;
- bool iscmd = (prot_level == PROT_CMD)?TRUE:FALSE;
-
- DEBUGASSERT(prot_level > PROT_NONE && prot_level < PROT_LAST);
-
- if(iscmd) {
- if(!strncmp(from, "PASS ", 5) || !strncmp(from, "ACCT ", 5))
- prot_level = PROT_PRIVATE;
- else
- prot_level = conn->command_prot;
- }
- bytes = conn->mech->encode(conn->app_data, from, length, prot_level,
- (void**)&buffer);
- if(!buffer || bytes <= 0)
- return; /* error */
-
- if(iscmd) {
- error = Curl_base64_encode(conn->data, buffer, curlx_sitouz(bytes),
- &cmd_buffer, &cmd_size);
- if(error) {
- free(buffer);
- return; /* error */
- }
- if(cmd_size > 0) {
- static const char *enc = "ENC ";
- static const char *mic = "MIC ";
- if(prot_level == PROT_PRIVATE)
- socket_write(conn, fd, enc, 4);
- else
- socket_write(conn, fd, mic, 4);
-
- socket_write(conn, fd, cmd_buffer, cmd_size);
- socket_write(conn, fd, "\r\n", 2);
- infof(conn->data, "Send: %s%s\n", prot_level == PROT_PRIVATE?enc:mic,
- cmd_buffer);
- free(cmd_buffer);
- }
- }
- else {
- htonl_bytes = htonl(bytes);
- socket_write(conn, fd, &htonl_bytes, sizeof(htonl_bytes));
- socket_write(conn, fd, buffer, curlx_sitouz(bytes));
- }
- free(buffer);
-}
-
-static ssize_t sec_write(struct connectdata *conn, curl_socket_t fd,
- const char *buffer, size_t length)
-{
- ssize_t tx = 0, len = conn->buffer_size;
-
- len -= conn->mech->overhead(conn->app_data, conn->data_prot,
- curlx_sztosi(len));
- if(len <= 0)
- len = length;
- while(length) {
- if(length < (size_t)len)
- len = length;
-
- do_sec_send(conn, fd, buffer, curlx_sztosi(len));
- length -= len;
- buffer += len;
- tx += len;
- }
- return tx;
-}
-
-/* Matches Curl_send signature */
-static ssize_t sec_send(struct connectdata *conn, int sockindex,
- const void *buffer, size_t len, CURLcode *err)
-{
- curl_socket_t fd = conn->sock[sockindex];
- *err = CURLE_OK;
- return sec_write(conn, fd, buffer, len);
-}
-
-CURL_STATIC int Curl_sec_read_msg(struct connectdata *conn, char *buffer,
- enum protection_level level)
-{
- /* decoded_len should be size_t or ssize_t but conn->mech->decode returns an
- int */
- int decoded_len;
- char *buf;
- int ret_code;
- size_t decoded_sz = 0;
- CURLcode error;
-
- DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
-
- error = Curl_base64_decode(buffer + 4, (unsigned char **)&buf, &decoded_sz);
- if(error || decoded_sz == 0)
- return -1;
-
- if(decoded_sz > (size_t)INT_MAX) {
- free(buf);
- return -1;
- }
- decoded_len = curlx_uztosi(decoded_sz);
-
- decoded_len = conn->mech->decode(conn->app_data, buf, decoded_len,
- level, conn);
- if(decoded_len <= 0) {
- free(buf);
- return -1;
- }
-
- if(conn->data->set.verbose) {
- buf[decoded_len] = '\n';
- Curl_debug(conn->data, CURLINFO_HEADER_IN, buf, decoded_len + 1, conn);
- }
-
- buf[decoded_len] = '\0';
- DEBUGASSERT(decoded_len > 3);
- if(buf[3] == '-')
- ret_code = 0;
- else {
- /* Check for error? */
- (void)sscanf(buf, "%d", &ret_code);
- }
-
- if(buf[decoded_len - 1] == '\n')
- buf[decoded_len - 1] = '\0';
- /* FIXME: Is |buffer| length always greater than |decoded_len|? */
- strcpy(buffer, buf);
- free(buf);
- return ret_code;
-}
-
-/* FIXME: The error code returned here is never checked. */
-static int sec_set_protection_level(struct connectdata *conn)
-{
- int code;
- char* pbsz;
- static unsigned int buffer_size = 1 << 20; /* 1048576 */
- enum protection_level level = conn->request_data_prot;
-
- DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
-
- if(!conn->sec_complete) {
- infof(conn->data, "Trying to change the protection level after the"
- "completion of the data exchange.\n");
- return -1;
- }
-
- /* Bail out if we try to set up the same level */
- if(conn->data_prot == level)
- return 0;
-
- if(level) {
- code = ftp_send_command(conn, "PBSZ %u", buffer_size);
- if(code < 0)
- return -1;
-
- if(code/100 != 2) {
- failf(conn->data, "Failed to set the protection's buffer size.");
- return -1;
- }
- conn->buffer_size = buffer_size;
-
- pbsz = strstr(conn->data->state.buffer, "PBSZ=");
- if(pbsz) {
- /* FIXME: Checks for errors in sscanf? */
- sscanf(pbsz, "PBSZ=%u", &buffer_size);
- if(buffer_size < conn->buffer_size)
- conn->buffer_size = buffer_size;
- }
- }
-
- /* Now try to negiociate the protection level. */
- code = ftp_send_command(conn, "PROT %c", level_to_char(level));
-
- if(code < 0)
- return -1;
-
- if(code/100 != 2) {
- failf(conn->data, "Failed to set the protection level.");
- return -1;
- }
-
- conn->data_prot = level;
- if(level == PROT_PRIVATE)
- conn->command_prot = level;
-
- return 0;
-}
-
-CURL_STATIC int
-Curl_sec_request_prot(struct connectdata *conn, const char *level)
-{
- enum protection_level l = name_to_level(level);
- if(l == PROT_NONE)
- return -1;
- DEBUGASSERT(l > PROT_NONE && l < PROT_LAST);
- conn->request_data_prot = l;
- return 0;
-}
-
-static CURLcode choose_mech(struct connectdata *conn)
-{
- int ret;
- struct SessionHandle *data = conn->data;
- const struct Curl_sec_client_mech * const *mech;
- void *tmp_allocation;
- const char *mech_name;
-
- 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", (void *)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;
-}
-
-CURL_STATIC CURLcode
-Curl_sec_login(struct connectdata *conn)
-{
- return choose_mech(conn);
-}
-
-
-CURL_STATIC void
-Curl_sec_end(struct connectdata *conn)
-{
- if(conn->mech != NULL && conn->mech->end)
- conn->mech->end(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_GSSAPI */
-
-#endif /* CURL_DISABLE_FTP */
|