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curl/lib/vauth/digest_sspi.c
Steve Holme 7d2a5a05f6 vauth: Updated the copyright year after recent changes 
As most of this work was performed in 2015 but not pushed until 2016
updated the copyright year to reflect the public facing changes.
2016-03-25 17:40:12 +00:00

528 lines
16 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2014 - 2016, Steve Holme, <steve_holme@hotmail.com>.
* Copyright (C) 2015, 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.
*
* RFC2831 DIGEST-MD5 authentication
*
***************************************************************************/
#include "curl_setup.h"
#if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_CRYPTO_AUTH)
#include <curl/curl.h>
#include "vauth/vauth.h"
#include "vauth/digest.h"
#include "urldata.h"
#include "curl_base64.h"
#include "warnless.h"
#include "curl_multibyte.h"
#include "sendf.h"
#include "strdup.h"
#include "rawstr.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
/*
* Curl_sasl_create_digest_md5_message()
*
* This is used to generate an already encoded DIGEST-MD5 response message
* ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg64 [in] - The base64 encoded challenge message.
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* service [in] - The service type such as www, smtp, pop or imap.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
TCHAR *spn = NULL;
size_t chlglen = 0;
size_t token_max = 0;
unsigned char *input_token = NULL;
unsigned char *output_token = NULL;
CredHandle credentials;
CtxtHandle context;
PSecPkgInfo SecurityPackage;
SEC_WINNT_AUTH_IDENTITY identity;
SEC_WINNT_AUTH_IDENTITY *p_identity;
SecBuffer chlg_buf;
SecBuffer resp_buf;
SecBufferDesc chlg_desc;
SecBufferDesc resp_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
/* Decode the base-64 encoded challenge message */
if(strlen(chlg64) && *chlg64 != '=') {
result = Curl_base64_decode(chlg64, &input_token, &chlglen);
if(result)
return result;
}
/* Ensure we have a valid challenge message */
if(!input_token) {
infof(data, "DIGEST-MD5 handshake failure (empty challenge message)\n");
return CURLE_BAD_CONTENT_ENCODING;
}
/* Query the security package for DigestSSP */
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
&SecurityPackage);
if(status != SEC_E_OK) {
free(input_token);
return CURLE_NOT_BUILT_IN;
}
token_max = SecurityPackage->cbMaxToken;
/* Release the package buffer as it is not required anymore */
s_pSecFn->FreeContextBuffer(SecurityPackage);
/* Allocate our response buffer */
output_token = malloc(token_max);
if(!output_token) {
free(input_token);
return CURLE_OUT_OF_MEMORY;
}
/* Generate our SPN */
spn = Curl_sasl_build_spn(service, data->easy_conn->host.name);
if(!spn) {
free(output_token);
free(input_token);
return CURLE_OUT_OF_MEMORY;
}
if(userp && *userp) {
/* Populate our identity structure */
result = Curl_create_sspi_identity(userp, passwdp, &identity);
if(result) {
free(spn);
free(output_token);
free(input_token);
return result;
}
/* Allow proper cleanup of the identity structure */
p_identity = &identity;
}
else
/* Use the current Windows user */
p_identity = NULL;
/* Acquire our credentials handle */
status = s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT(SP_NAME_DIGEST),
SECPKG_CRED_OUTBOUND, NULL,
p_identity, NULL, NULL,
&credentials, &expiry);
if(status != SEC_E_OK) {
Curl_sspi_free_identity(p_identity);
free(spn);
free(output_token);
free(input_token);
return CURLE_LOGIN_DENIED;
}
/* Setup the challenge "input" security buffer */
chlg_desc.ulVersion = SECBUFFER_VERSION;
chlg_desc.cBuffers = 1;
chlg_desc.pBuffers = &chlg_buf;
chlg_buf.BufferType = SECBUFFER_TOKEN;
chlg_buf.pvBuffer = input_token;
chlg_buf.cbBuffer = curlx_uztoul(chlglen);
/* Setup the response "output" security buffer */
resp_desc.ulVersion = SECBUFFER_VERSION;
resp_desc.cBuffers = 1;
resp_desc.pBuffers = &resp_buf;
resp_buf.BufferType = SECBUFFER_TOKEN;
resp_buf.pvBuffer = output_token;
resp_buf.cbBuffer = curlx_uztoul(token_max);
/* Generate our response message */
status = s_pSecFn->InitializeSecurityContext(&credentials, NULL, spn,
0, 0, 0, &chlg_desc, 0,
&context, &resp_desc, &attrs,
&expiry);
if(status == SEC_I_COMPLETE_NEEDED ||
status == SEC_I_COMPLETE_AND_CONTINUE)
s_pSecFn->CompleteAuthToken(&credentials, &resp_desc);
else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
s_pSecFn->FreeCredentialsHandle(&credentials);
Curl_sspi_free_identity(p_identity);
free(spn);
free(output_token);
free(input_token);
return CURLE_RECV_ERROR;
}
/* Base64 encode the response */
result = Curl_base64_encode(data, (char *) output_token, resp_buf.cbBuffer,
outptr, outlen);
/* Free our handles */
s_pSecFn->DeleteSecurityContext(&context);
s_pSecFn->FreeCredentialsHandle(&credentials);
/* Free the identity structure */
Curl_sspi_free_identity(p_identity);
/* Free the SPN */
free(spn);
/* Free the response buffer */
free(output_token);
/* Free the decoded challenge message */
free(input_token);
return result;
}
/*
* Curl_override_sspi_http_realm()
*
* This is used to populate the domain in a SSPI identity structure
* The realm is extracted from the challenge message and used as the
* domain if it is not already explicitly set.
*
* Parameters:
*
* chlg [in] - The challenge message.
* identity [in/out] - The identity structure.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_override_sspi_http_realm(const char *chlg,
SEC_WINNT_AUTH_IDENTITY *identity)
{
xcharp_u domain, dup_domain;
/* If domain is blank or unset, check challenge message for realm */
if(!identity->Domain || !identity->DomainLength) {
for(;;) {
char value[DIGEST_MAX_VALUE_LENGTH];
char content[DIGEST_MAX_CONTENT_LENGTH];
/* Pass all additional spaces here */
while(*chlg && ISSPACE(*chlg))
chlg++;
/* Extract a value=content pair */
if(Curl_sasl_digest_get_pair(chlg, value, content, &chlg)) {
if(Curl_raw_equal(value, "realm")) {
/* Setup identity's domain and length */
domain.tchar_ptr = Curl_convert_UTF8_to_tchar((char *) content);
if(!domain.tchar_ptr)
return CURLE_OUT_OF_MEMORY;
dup_domain.tchar_ptr = _tcsdup(domain.tchar_ptr);
if(!dup_domain.tchar_ptr) {
Curl_unicodefree(domain.tchar_ptr);
return CURLE_OUT_OF_MEMORY;
}
free(identity->Domain);
identity->Domain = dup_domain.tbyte_ptr;
identity->DomainLength = curlx_uztoul(_tcslen(dup_domain.tchar_ptr));
dup_domain.tchar_ptr = NULL;
Curl_unicodefree(domain.tchar_ptr);
}
else {
/* Unknown specifier, ignore it! */
}
}
else
break; /* We're done here */
/* Pass all additional spaces here */
while(*chlg && ISSPACE(*chlg))
chlg++;
/* Allow the list to be comma-separated */
if(',' == *chlg)
chlg++;
}
}
return CURLE_OK;
}
/*
* Curl_sasl_decode_digest_http_message()
*
* This is used to decode a HTTP DIGEST challenge message into the seperate
* attributes.
*
* Parameters:
*
* chlg [in] - The challenge message.
* digest [in/out] - The digest data struct being used and modified.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_decode_digest_http_message(const char *chlg,
struct digestdata *digest)
{
size_t chlglen = strlen(chlg);
/* We had an input token before and we got another one now. This means we
provided bad credentials in the previous request. */
if(digest->input_token)
return CURLE_BAD_CONTENT_ENCODING;
/* Simply store the challenge for use later */
digest->input_token = (BYTE *) Curl_memdup(chlg, chlglen);
if(!digest->input_token)
return CURLE_OUT_OF_MEMORY;
digest->input_token_len = chlglen;
return CURLE_OK;
}
/*
* Curl_sasl_create_digest_http_message()
*
* This is used to generate a HTTP DIGEST response message ready for sending
* to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* userp [in] - The user name in the format User or Domain\User.
* passdwp [in] - The user's password.
* request [in] - The HTTP request.
* uripath [in] - The path of the HTTP uri.
* digest [in/out] - The digest data struct being used and modified.
* outptr [in/out] - The address where a pointer to newly allocated memory
* holding the result will be stored upon completion.
* outlen [out] - The length of the output message.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sasl_create_digest_http_message(struct SessionHandle *data,
const char *userp,
const char *passwdp,
const unsigned char *request,
const unsigned char *uripath,
struct digestdata *digest,
char **outptr, size_t *outlen)
{
size_t token_max;
CredHandle credentials;
CtxtHandle context;
char *resp;
BYTE *output_token;
PSecPkgInfo SecurityPackage;
SEC_WINNT_AUTH_IDENTITY identity;
SEC_WINNT_AUTH_IDENTITY *p_identity;
SecBuffer chlg_buf[3];
SecBuffer resp_buf;
SecBufferDesc chlg_desc;
SecBufferDesc resp_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
TCHAR *spn;
(void) data;
/* Query the security package for DigestSSP */
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
&SecurityPackage);
if(status != SEC_E_OK)
return CURLE_NOT_BUILT_IN;
token_max = SecurityPackage->cbMaxToken;
/* Release the package buffer as it is not required anymore */
s_pSecFn->FreeContextBuffer(SecurityPackage);
/* Allocate the output buffer according to the max token size as indicated
by the security package */
output_token = malloc(token_max);
if(!output_token)
return CURLE_OUT_OF_MEMORY;
if(userp && *userp) {
/* Populate our identity structure */
if(Curl_create_sspi_identity(userp, passwdp, &identity))
return CURLE_OUT_OF_MEMORY;
/* Populate our identity domain */
if(Curl_override_sspi_http_realm((const char*) digest->input_token,
&identity))
return CURLE_OUT_OF_MEMORY;
/* Allow proper cleanup of the identity structure */
p_identity = &identity;
}
else
/* Use the current Windows user */
p_identity = NULL;
/* Acquire our credentials handle */
status = s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT(SP_NAME_DIGEST),
SECPKG_CRED_OUTBOUND, NULL,
p_identity, NULL, NULL,
&credentials, &expiry);
if(status != SEC_E_OK) {
Curl_sspi_free_identity(p_identity);
free(output_token);
return CURLE_LOGIN_DENIED;
}
/* Setup the challenge "input" security buffer if present */
chlg_desc.ulVersion = SECBUFFER_VERSION;
chlg_desc.cBuffers = 3;
chlg_desc.pBuffers = chlg_buf;
chlg_buf[0].BufferType = SECBUFFER_TOKEN;
chlg_buf[0].pvBuffer = digest->input_token;
chlg_buf[0].cbBuffer = curlx_uztoul(digest->input_token_len);
chlg_buf[1].BufferType = SECBUFFER_PKG_PARAMS;
chlg_buf[1].pvBuffer = (void *) request;
chlg_buf[1].cbBuffer = curlx_uztoul(strlen((const char *) request));
chlg_buf[2].BufferType = SECBUFFER_PKG_PARAMS;
chlg_buf[2].pvBuffer = NULL;
chlg_buf[2].cbBuffer = 0;
/* Setup the response "output" security buffer */
resp_desc.ulVersion = SECBUFFER_VERSION;
resp_desc.cBuffers = 1;
resp_desc.pBuffers = &resp_buf;
resp_buf.BufferType = SECBUFFER_TOKEN;
resp_buf.pvBuffer = output_token;
resp_buf.cbBuffer = curlx_uztoul(token_max);
spn = Curl_convert_UTF8_to_tchar((char *) uripath);
if(!spn) {
Curl_sspi_free_identity(p_identity);
free(output_token);
return CURLE_OUT_OF_MEMORY;
}
/* Generate our reponse message */
status = s_pSecFn->InitializeSecurityContext(&credentials, NULL,
spn,
ISC_REQ_USE_HTTP_STYLE, 0, 0,
&chlg_desc, 0, &context,
&resp_desc, &attrs, &expiry);
Curl_unicodefree(spn);
if(status == SEC_I_COMPLETE_NEEDED ||
status == SEC_I_COMPLETE_AND_CONTINUE)
s_pSecFn->CompleteAuthToken(&credentials, &resp_desc);
else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
s_pSecFn->FreeCredentialsHandle(&credentials);
Curl_sspi_free_identity(p_identity);
free(output_token);
return CURLE_OUT_OF_MEMORY;
}
resp = malloc(resp_buf.cbBuffer + 1);
if(!resp) {
s_pSecFn->DeleteSecurityContext(&context);
s_pSecFn->FreeCredentialsHandle(&credentials);
Curl_sspi_free_identity(p_identity);
free(output_token);
return CURLE_OUT_OF_MEMORY;
}
/* Copy the generated reponse */
memcpy(resp, resp_buf.pvBuffer, resp_buf.cbBuffer);
resp[resp_buf.cbBuffer] = 0x00;
/* Return the response */
*outptr = resp;
*outlen = resp_buf.cbBuffer;
/* Free our handles */
s_pSecFn->DeleteSecurityContext(&context);
s_pSecFn->FreeCredentialsHandle(&credentials);
/* Free the identity structure */
Curl_sspi_free_identity(p_identity);
/* Free the response buffer */
free(output_token);
return CURLE_OK;
}
/*
* Curl_sasl_digest_cleanup()
*
* This is used to clean up the digest specific data.
*
* Parameters:
*
* digest [in/out] - The digest data struct being cleaned up.
*
*/
void Curl_sasl_digest_cleanup(struct digestdata *digest)
{
/* Free the input token */
Curl_safefree(digest->input_token);
/* Reset any variables */
digest->input_token_len = 0;
}
#endif /* USE_WINDOWS_SSPI && !CURL_DISABLE_CRYPTO_AUTH */
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