diff options
Diffstat (limited to 'lib/socks_sspi.c')
| -rw-r--r-- | lib/socks_sspi.c | 591 |
1 files changed, 0 insertions, 591 deletions
diff --git a/lib/socks_sspi.c b/lib/socks_sspi.c deleted file mode 100644 index c57610717..000000000 --- a/lib/socks_sspi.c +++ /dev/null @@ -1,591 +0,0 @@ -/*************************************************************************** - * _ _ ____ _ - * Project ___| | | | _ \| | - * / __| | | | |_) | | - * | (__| |_| | _ <| |___ - * \___|\___/|_| \_\_____| - * - * Copyright (C) 2009, 2011, Markus Moeller, <markus_moeller@compuserve.com> - * Copyright (C) 2012, Daniel Stenberg, <daniel@haxx.se>, et al. - * - * This software is licensed as described in the file COPYING, which - * you should have received as part of this distribution. The terms - * are also available at http://curl.haxx.se/docs/copyright.html. - * - * You may opt to use, copy, modify, merge, publish, distribute and/or sell - * copies of the Software, and permit persons to whom the Software is - * furnished to do so, under the terms of the COPYING file. - * - * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY - * KIND, either express or implied. - * - ***************************************************************************/ - -#include "curl_setup.h" - -#if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_PROXY) - -#include "curl_urldata.h" -#include "curl_sendf.h" -#include "curl_connect.h" -#include "curl_strerror.h" -#include "curl_timeval.h" -#include "curl_socks.h" -#include "curl_sspi.h" -#include "curl_multibyte.h" -#include "curl_warnless.h" - -#define _MPRINTF_REPLACE /* use the internal *printf() functions */ -#include <curl/mprintf.h> - -#include "curl_memory.h" -/* The last #include file should be: */ -#include "curl_memdebug.h" - -/* - * Definitions required from ntsecapi.h are directly provided below this point - * to avoid including ntsecapi.h due to a conflict with OpenSSL's safestack.h - */ -#define KERB_WRAP_NO_ENCRYPT 0x80000001 - -/* - * Helper sspi error functions. - */ -static int check_sspi_err(struct connectdata *conn, - SECURITY_STATUS status, - const char* function) -{ - if(status != SEC_E_OK && - status != SEC_I_COMPLETE_AND_CONTINUE && - status != SEC_I_COMPLETE_NEEDED && - status != SEC_I_CONTINUE_NEEDED) { - failf(conn->data, "SSPI error: %s failed: %s", function, - Curl_sspi_strerror(conn, status)); - return 1; - } - return 0; -} - -/* This is the SSPI-using version of this function */ -CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex, - struct connectdata *conn) -{ - struct SessionHandle *data = conn->data; - curl_socket_t sock = conn->sock[sockindex]; - CURLcode code; - ssize_t actualread; - ssize_t written; - int result; - /* Needs GSSAPI authentication */ - SECURITY_STATUS status; - unsigned long sspi_ret_flags = 0; - int gss_enc; - SecBuffer sspi_send_token, sspi_recv_token, sspi_w_token[3]; - SecBufferDesc input_desc, output_desc, wrap_desc; - SecPkgContext_Sizes sspi_sizes; - CredHandle cred_handle; - CtxtHandle sspi_context; - PCtxtHandle context_handle = NULL; - SecPkgCredentials_Names names; - TimeStamp expiry; - char *service_name = NULL; - unsigned short us_length; - unsigned long qop; - unsigned char socksreq[4]; /* room for gssapi exchange header only */ - char *service = data->set.str[STRING_SOCKS5_GSSAPI_SERVICE]; - - /* GSSAPI request looks like - * +----+------+-----+----------------+ - * |VER | MTYP | LEN | TOKEN | - * +----+------+----------------------+ - * | 1 | 1 | 2 | up to 2^16 - 1 | - * +----+------+-----+----------------+ - */ - - /* prepare service name */ - if(strchr(service, '/')) { - service_name = malloc(strlen(service)); - if(!service_name) - return CURLE_OUT_OF_MEMORY; - memcpy(service_name, service, strlen(service)); - } - else { - service_name = malloc(strlen(service) + strlen(conn->proxy.name) + 2); - if(!service_name) - return CURLE_OUT_OF_MEMORY; - snprintf(service_name,strlen(service) +strlen(conn->proxy.name)+2,"%s/%s", - service,conn->proxy.name); - } - - input_desc.cBuffers = 1; - input_desc.pBuffers = &sspi_recv_token; - input_desc.ulVersion = SECBUFFER_VERSION; - - sspi_recv_token.BufferType = SECBUFFER_TOKEN; - sspi_recv_token.cbBuffer = 0; - sspi_recv_token.pvBuffer = NULL; - - output_desc.cBuffers = 1; - output_desc.pBuffers = &sspi_send_token; - output_desc.ulVersion = SECBUFFER_VERSION; - - sspi_send_token.BufferType = SECBUFFER_TOKEN; - sspi_send_token.cbBuffer = 0; - sspi_send_token.pvBuffer = NULL; - - wrap_desc.cBuffers = 3; - wrap_desc.pBuffers = sspi_w_token; - wrap_desc.ulVersion = SECBUFFER_VERSION; - - cred_handle.dwLower = 0; - cred_handle.dwUpper = 0; - - status = s_pSecFn->AcquireCredentialsHandle(NULL, - (TCHAR *) TEXT("Kerberos"), - SECPKG_CRED_OUTBOUND, - NULL, - NULL, - NULL, - NULL, - &cred_handle, - &expiry); - - if(check_sspi_err(conn, status, "AcquireCredentialsHandle")) { - failf(data, "Failed to acquire credentials."); - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - return CURLE_COULDNT_CONNECT; - } - - /* As long as we need to keep sending some context info, and there's no */ - /* errors, keep sending it... */ - for(;;) { - TCHAR *sname; - - sname = Curl_convert_UTF8_to_tchar(service_name); - if(!sname) - return CURLE_OUT_OF_MEMORY; - - status = s_pSecFn->InitializeSecurityContext(&cred_handle, - context_handle, - sname, - ISC_REQ_MUTUAL_AUTH | - ISC_REQ_ALLOCATE_MEMORY | - ISC_REQ_CONFIDENTIALITY | - ISC_REQ_REPLAY_DETECT, - 0, - SECURITY_NATIVE_DREP, - &input_desc, - 0, - &sspi_context, - &output_desc, - &sspi_ret_flags, - &expiry); - - Curl_unicodefree(sname); - - if(sspi_recv_token.pvBuffer) { - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - sspi_recv_token.pvBuffer = NULL; - sspi_recv_token.cbBuffer = 0; - } - - if(check_sspi_err(conn, status, "InitializeSecurityContext")) { - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - failf(data, "Failed to initialise security context."); - return CURLE_COULDNT_CONNECT; - } - - if(sspi_send_token.cbBuffer != 0) { - socksreq[0] = 1; /* gssapi subnegotiation version */ - socksreq[1] = 1; /* authentication message type */ - us_length = htons((short)sspi_send_token.cbBuffer); - memcpy(socksreq+2, &us_length, sizeof(short)); - - code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written); - if((code != CURLE_OK) || (4 != written)) { - failf(data, "Failed to send SSPI authentication request."); - Curl_safefree(service_name); - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer, - sspi_send_token.cbBuffer, &written); - if((code != CURLE_OK) || (sspi_send_token.cbBuffer != (size_t)written)) { - failf(data, "Failed to send SSPI authentication token."); - Curl_safefree(service_name); - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - } - - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - sspi_send_token.pvBuffer = NULL; - sspi_send_token.cbBuffer = 0; - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - sspi_recv_token.pvBuffer = NULL; - sspi_recv_token.cbBuffer = 0; - if(status != SEC_I_CONTINUE_NEEDED) - break; - - /* analyse response */ - - /* GSSAPI response looks like - * +----+------+-----+----------------+ - * |VER | MTYP | LEN | TOKEN | - * +----+------+----------------------+ - * | 1 | 1 | 2 | up to 2^16 - 1 | - * +----+------+-----+----------------+ - */ - - result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread); - if(result != CURLE_OK || actualread != 4) { - failf(data, "Failed to receive SSPI authentication response."); - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - /* ignore the first (VER) byte */ - if(socksreq[1] == 255) { /* status / message type */ - failf(data, "User was rejected by the SOCKS5 server (%d %d).", - socksreq[0], socksreq[1]); - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - if(socksreq[1] != 1) { /* status / messgae type */ - failf(data, "Invalid SSPI authentication response type (%d %d).", - socksreq[0], socksreq[1]); - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - memcpy(&us_length, socksreq+2, sizeof(short)); - us_length = ntohs(us_length); - - sspi_recv_token.cbBuffer = us_length; - sspi_recv_token.pvBuffer = malloc(us_length); - - if(!sspi_recv_token.pvBuffer) { - Curl_safefree(service_name); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - result = Curl_blockread_all(conn, sock, (char *)sspi_recv_token.pvBuffer, - sspi_recv_token.cbBuffer, &actualread); - - if(result != CURLE_OK || actualread != us_length) { - failf(data, "Failed to receive SSPI authentication token."); - Curl_safefree(service_name); - s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - context_handle = &sspi_context; - } - - Curl_safefree(service_name); - - /* Everything is good so far, user was authenticated! */ - status = s_pSecFn->QueryCredentialsAttributes(&cred_handle, - SECPKG_CRED_ATTR_NAMES, - &names); - s_pSecFn->FreeCredentialsHandle(&cred_handle); - if(check_sspi_err(conn, status, "QueryCredentialAttributes")) { - s_pSecFn->DeleteSecurityContext(&sspi_context); - s_pSecFn->FreeContextBuffer(names.sUserName); - failf(data, "Failed to determine user name."); - return CURLE_COULDNT_CONNECT; - } - infof(data, "SOCKS5 server authencticated user %s with gssapi.\n", - names.sUserName); - s_pSecFn->FreeContextBuffer(names.sUserName); - - /* Do encryption */ - socksreq[0] = 1; /* gssapi subnegotiation version */ - socksreq[1] = 2; /* encryption message type */ - - gss_enc = 0; /* no data protection */ - /* do confidentiality protection if supported */ - if(sspi_ret_flags & ISC_REQ_CONFIDENTIALITY) - gss_enc = 2; - /* else do integrity protection */ - else if(sspi_ret_flags & ISC_REQ_INTEGRITY) - gss_enc = 1; - - infof(data, "SOCKS5 server supports gssapi %s data protection.\n", - (gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality") ); - /* force to no data protection, avoid encryption/decryption for now */ - gss_enc = 0; - /* - * Sending the encryption type in clear seems wrong. It should be - * protected with gss_seal()/gss_wrap(). See RFC1961 extract below - * The NEC reference implementations on which this is based is - * therefore at fault - * - * +------+------+------+.......................+ - * + ver | mtyp | len | token | - * +------+------+------+.......................+ - * + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets | - * +------+------+------+.......................+ - * - * Where: - * - * - "ver" is the protocol version number, here 1 to represent the - * first version of the SOCKS/GSS-API protocol - * - * - "mtyp" is the message type, here 2 to represent a protection - * -level negotiation message - * - * - "len" is the length of the "token" field in octets - * - * - "token" is the GSS-API encapsulated protection level - * - * The token is produced by encapsulating an octet containing the - * required protection level using gss_seal()/gss_wrap() with conf_req - * set to FALSE. The token is verified using gss_unseal()/ - * gss_unwrap(). - * - */ - - if(data->set.socks5_gssapi_nec) { - us_length = htons((short)1); - memcpy(socksreq+2, &us_length, sizeof(short)); - } - else { - status = s_pSecFn->QueryContextAttributes(&sspi_context, - SECPKG_ATTR_SIZES, - &sspi_sizes); - if(check_sspi_err(conn, status, "QueryContextAttributes")) { - s_pSecFn->DeleteSecurityContext(&sspi_context); - failf(data, "Failed to query security context attributes."); - return CURLE_COULDNT_CONNECT; - } - - sspi_w_token[0].cbBuffer = sspi_sizes.cbSecurityTrailer; - sspi_w_token[0].BufferType = SECBUFFER_TOKEN; - sspi_w_token[0].pvBuffer = malloc(sspi_sizes.cbSecurityTrailer); - - if(!sspi_w_token[0].pvBuffer) { - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - - sspi_w_token[1].cbBuffer = 1; - sspi_w_token[1].pvBuffer = malloc(1); - if(!sspi_w_token[1].pvBuffer) { - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - - memcpy(sspi_w_token[1].pvBuffer,&gss_enc,1); - sspi_w_token[2].BufferType = SECBUFFER_PADDING; - sspi_w_token[2].cbBuffer = sspi_sizes.cbBlockSize; - sspi_w_token[2].pvBuffer = malloc(sspi_sizes.cbBlockSize); - if(!sspi_w_token[2].pvBuffer) { - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - status = s_pSecFn->EncryptMessage(&sspi_context, - KERB_WRAP_NO_ENCRYPT, - &wrap_desc, - 0); - if(check_sspi_err(conn, status, "EncryptMessage")) { - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - failf(data, "Failed to query security context attributes."); - return CURLE_COULDNT_CONNECT; - } - sspi_send_token.cbBuffer = sspi_w_token[0].cbBuffer - + sspi_w_token[1].cbBuffer - + sspi_w_token[2].cbBuffer; - sspi_send_token.pvBuffer = malloc(sspi_send_token.cbBuffer); - if(!sspi_send_token.pvBuffer) { - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - - memcpy(sspi_send_token.pvBuffer, sspi_w_token[0].pvBuffer, - sspi_w_token[0].cbBuffer); - memcpy((PUCHAR) sspi_send_token.pvBuffer +(int)sspi_w_token[0].cbBuffer, - sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer); - memcpy((PUCHAR) sspi_send_token.pvBuffer - +sspi_w_token[0].cbBuffer - +sspi_w_token[1].cbBuffer, - sspi_w_token[2].pvBuffer, sspi_w_token[2].cbBuffer); - - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - sspi_w_token[0].pvBuffer = NULL; - sspi_w_token[0].cbBuffer = 0; - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - sspi_w_token[1].pvBuffer = NULL; - sspi_w_token[1].cbBuffer = 0; - s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer); - sspi_w_token[2].pvBuffer = NULL; - sspi_w_token[2].cbBuffer = 0; - - us_length = htons((short)sspi_send_token.cbBuffer); - memcpy(socksreq+2,&us_length,sizeof(short)); - } - - code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written); - if((code != CURLE_OK) || (4 != written)) { - failf(data, "Failed to send SSPI encryption request."); - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - if(data->set.socks5_gssapi_nec) { - memcpy(socksreq,&gss_enc,1); - code = Curl_write_plain(conn, sock, (char *)socksreq, 1, &written); - if((code != CURLE_OK) || (1 != written)) { - failf(data, "Failed to send SSPI encryption type."); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - } - else { - code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer, - sspi_send_token.cbBuffer, &written); - if((code != CURLE_OK) || (sspi_send_token.cbBuffer != (size_t)written)) { - failf(data, "Failed to send SSPI encryption type."); - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer); - } - - result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread); - if(result != CURLE_OK || actualread != 4) { - failf(data, "Failed to receive SSPI encryption response."); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - /* ignore the first (VER) byte */ - if(socksreq[1] == 255) { /* status / message type */ - failf(data, "User was rejected by the SOCKS5 server (%d %d).", - socksreq[0], socksreq[1]); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - if(socksreq[1] != 2) { /* status / message type */ - failf(data, "Invalid SSPI encryption response type (%d %d).", - socksreq[0], socksreq[1]); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - memcpy(&us_length, socksreq+2, sizeof(short)); - us_length = ntohs(us_length); - - sspi_w_token[0].cbBuffer = us_length; - sspi_w_token[0].pvBuffer = malloc(us_length); - if(!sspi_w_token[0].pvBuffer) { - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_OUT_OF_MEMORY; - } - - result = Curl_blockread_all(conn, sock, (char *)sspi_w_token[0].pvBuffer, - sspi_w_token[0].cbBuffer, &actualread); - - if(result != CURLE_OK || actualread != us_length) { - failf(data, "Failed to receive SSPI encryption type."); - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - - if(!data->set.socks5_gssapi_nec) { - wrap_desc.cBuffers = 2; - sspi_w_token[0].BufferType = SECBUFFER_STREAM; - sspi_w_token[1].BufferType = SECBUFFER_DATA; - sspi_w_token[1].cbBuffer = 0; - sspi_w_token[1].pvBuffer = NULL; - - status = s_pSecFn->DecryptMessage(&sspi_context, - &wrap_desc, - 0, - &qop); - - if(check_sspi_err(conn, status, "DecryptMessage")) { - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - failf(data, "Failed to query security context attributes."); - return CURLE_COULDNT_CONNECT; - } - - if(sspi_w_token[1].cbBuffer != 1) { - failf(data, "Invalid SSPI encryption response length (%d).", - sspi_w_token[1].cbBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - - memcpy(socksreq,sspi_w_token[1].pvBuffer,sspi_w_token[1].cbBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer); - } - else { - if(sspi_w_token[0].cbBuffer != 1) { - failf(data, "Invalid SSPI encryption response length (%d).", - sspi_w_token[0].cbBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - s_pSecFn->DeleteSecurityContext(&sspi_context); - return CURLE_COULDNT_CONNECT; - } - memcpy(socksreq,sspi_w_token[0].pvBuffer,sspi_w_token[0].cbBuffer); - s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer); - } - - infof(data, "SOCKS5 access with%s protection granted.\n", - (socksreq[0]==0)?"out gssapi data": - ((socksreq[0]==1)?" gssapi integrity":" gssapi confidentiality")); - - /* For later use if encryption is required - conn->socks5_gssapi_enctype = socksreq[0]; - if(socksreq[0] != 0) - conn->socks5_sspi_context = sspi_context; - else { - s_pSecFn->DeleteSecurityContext(&sspi_context); - conn->socks5_sspi_context = sspi_context; - } - */ - return CURLE_OK; -} -#endif |