476 lines
15 KiB
C
476 lines
15 KiB
C
|
/***************************************************************************
|
||
|
|
* _ _ ____ _
|
||
|
|
* Project ___| | | | _ \| |
|
||
|
|
* / __| | | | |_) | |
|
||
|
|
* | (__| |_| | _ <| |___
|
||
|
|
* \___|\___/|_| \_\_____|
|
||
|
|
*
|
||
|
|
* Copyright (C) Steve Holme, <steve_holme@hotmail.com>.
|
||
|
|
*
|
||
|
|
* 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 https://curl.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.
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: curl
|
||
|
|
*
|
||
|
|
* RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism
|
||
|
|
*
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
#include "curl_setup.h"
|
||
|
|
|
||
|
|
#if defined(USE_WINDOWS_SSPI) && defined(USE_KERBEROS5)
|
||
|
|
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
#include "vauth/vauth.h"
|
||
|
|
#include "urldata.h"
|
||
|
|
#include "warnless.h"
|
||
|
|
#include "curl_multibyte.h"
|
||
|
|
#include "sendf.h"
|
||
|
|
|
||
|
|
/* The last #include files should be: */
|
||
|
|
#include "curl_memory.h"
|
||
|
|
#include "memdebug.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Curl_auth_is_gssapi_supported()
|
||
|
|
*
|
||
|
|
* This is used to evaluate if GSSAPI (Kerberos V5) is supported.
|
||
|
|
*
|
||
|
|
* Parameters: None
|
||
|
|
*
|
||
|
|
* Returns TRUE if Kerberos V5 is supported by Windows SSPI.
|
||
|
|
*/
|
||
|
|
bool Curl_auth_is_gssapi_supported(void)
|
||
|
|
{
|
||
|
|
PSecPkgInfo SecurityPackage;
|
||
|
|
SECURITY_STATUS status;
|
||
|
|
|
||
|
|
/* Query the security package for Kerberos */
|
||
|
|
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
|
||
|
|
TEXT(SP_NAME_KERBEROS),
|
||
|
|
&SecurityPackage);
|
||
|
|
|
||
|
|
/* Release the package buffer as it is not required anymore */
|
||
|
|
if(status == SEC_E_OK) {
|
||
|
|
s_pSecFn->FreeContextBuffer(SecurityPackage);
|
||
|
|
}
|
||
|
|
|
||
|
|
return (status == SEC_E_OK ? TRUE : FALSE);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Curl_auth_create_gssapi_user_message()
|
||
|
|
*
|
||
|
|
* This is used to generate an already encoded GSSAPI (Kerberos V5) user token
|
||
|
|
* 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.
|
||
|
|
* passwdp [in] - The user's password.
|
||
|
|
* service [in] - The service type such as http, smtp, pop or imap.
|
||
|
|
* host [in] - The host name.
|
||
|
|
* mutual_auth [in] - Flag specifying whether or not mutual authentication
|
||
|
|
* is enabled.
|
||
|
|
* chlg [in] - Optional challenge message.
|
||
|
|
* krb5 [in/out] - The Kerberos 5 data struct being used and modified.
|
||
|
|
* out [out] - The result storage.
|
||
|
|
*
|
||
|
|
* Returns CURLE_OK on success.
|
||
|
|
*/
|
||
|
|
CURLcode Curl_auth_create_gssapi_user_message(struct Curl_easy *data,
|
||
|
|
const char *userp,
|
||
|
|
const char *passwdp,
|
||
|
|
const char *service,
|
||
|
|
const char *host,
|
||
|
|
const bool mutual_auth,
|
||
|
|
const struct bufref *chlg,
|
||
|
|
struct kerberos5data *krb5,
|
||
|
|
struct bufref *out)
|
||
|
|
{
|
||
|
|
CURLcode result = CURLE_OK;
|
||
|
|
CtxtHandle context;
|
||
|
|
PSecPkgInfo SecurityPackage;
|
||
|
|
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 */
|
||
|
|
|
||
|
|
if(!krb5->spn) {
|
||
|
|
/* Generate our SPN */
|
||
|
|
krb5->spn = Curl_auth_build_spn(service, host, NULL);
|
||
|
|
if(!krb5->spn)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(!krb5->output_token) {
|
||
|
|
/* Query the security package for Kerberos */
|
||
|
|
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
|
||
|
|
TEXT(SP_NAME_KERBEROS),
|
||
|
|
&SecurityPackage);
|
||
|
|
if(status != SEC_E_OK) {
|
||
|
|
failf(data, "SSPI: couldn't get auth info");
|
||
|
|
return CURLE_AUTH_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
krb5->token_max = SecurityPackage->cbMaxToken;
|
||
|
|
|
||
|
|
/* Release the package buffer as it is not required anymore */
|
||
|
|
s_pSecFn->FreeContextBuffer(SecurityPackage);
|
||
|
|
|
||
|
|
/* Allocate our response buffer */
|
||
|
|
krb5->output_token = malloc(krb5->token_max);
|
||
|
|
if(!krb5->output_token)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(!krb5->credentials) {
|
||
|
|
/* Do we have credentials to use or are we using single sign-on? */
|
||
|
|
if(userp && *userp) {
|
||
|
|
/* Populate our identity structure */
|
||
|
|
result = Curl_create_sspi_identity(userp, passwdp, &krb5->identity);
|
||
|
|
if(result)
|
||
|
|
return result;
|
||
|
|
|
||
|
|
/* Allow proper cleanup of the identity structure */
|
||
|
|
krb5->p_identity = &krb5->identity;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
/* Use the current Windows user */
|
||
|
|
krb5->p_identity = NULL;
|
||
|
|
|
||
|
|
/* Allocate our credentials handle */
|
||
|
|
krb5->credentials = calloc(1, sizeof(CredHandle));
|
||
|
|
if(!krb5->credentials)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
/* Acquire our credentials handle */
|
||
|
|
status = s_pSecFn->AcquireCredentialsHandle(NULL,
|
||
|
|
(TCHAR *)
|
||
|
|
TEXT(SP_NAME_KERBEROS),
|
||
|
|
SECPKG_CRED_OUTBOUND, NULL,
|
||
|
|
krb5->p_identity, NULL, NULL,
|
||
|
|
krb5->credentials, &expiry);
|
||
|
|
if(status != SEC_E_OK)
|
||
|
|
return CURLE_LOGIN_DENIED;
|
||
|
|
|
||
|
|
/* Allocate our new context handle */
|
||
|
|
krb5->context = calloc(1, sizeof(CtxtHandle));
|
||
|
|
if(!krb5->context)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(chlg) {
|
||
|
|
if(!Curl_bufref_len(chlg)) {
|
||
|
|
infof(data, "GSSAPI handshake failure (empty challenge message)");
|
||
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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 = (void *) Curl_bufref_ptr(chlg);
|
||
|
|
chlg_buf.cbBuffer = curlx_uztoul(Curl_bufref_len(chlg));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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 = krb5->output_token;
|
||
|
|
resp_buf.cbBuffer = curlx_uztoul(krb5->token_max);
|
||
|
|
|
||
|
|
/* Generate our challenge-response message */
|
||
|
|
status = s_pSecFn->InitializeSecurityContext(krb5->credentials,
|
||
|
|
chlg ? krb5->context : NULL,
|
||
|
|
krb5->spn,
|
||
|
|
(mutual_auth ?
|
||
|
|
ISC_REQ_MUTUAL_AUTH : 0),
|
||
|
|
0, SECURITY_NATIVE_DREP,
|
||
|
|
chlg ? &chlg_desc : NULL, 0,
|
||
|
|
&context,
|
||
|
|
&resp_desc, &attrs,
|
||
|
|
&expiry);
|
||
|
|
|
||
|
|
if(status == SEC_E_INSUFFICIENT_MEMORY)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED)
|
||
|
|
return CURLE_AUTH_ERROR;
|
||
|
|
|
||
|
|
if(memcmp(&context, krb5->context, sizeof(context))) {
|
||
|
|
s_pSecFn->DeleteSecurityContext(krb5->context);
|
||
|
|
|
||
|
|
memcpy(krb5->context, &context, sizeof(context));
|
||
|
|
}
|
||
|
|
|
||
|
|
if(resp_buf.cbBuffer) {
|
||
|
|
result = Curl_bufref_memdup(out, resp_buf.pvBuffer, resp_buf.cbBuffer);
|
||
|
|
}
|
||
|
|
else if(mutual_auth)
|
||
|
|
Curl_bufref_set(out, "", 0, NULL);
|
||
|
|
else
|
||
|
|
Curl_bufref_set(out, NULL, 0, NULL);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Curl_auth_create_gssapi_security_message()
|
||
|
|
*
|
||
|
|
* This is used to generate an already encoded GSSAPI (Kerberos V5) security
|
||
|
|
* token message ready for sending to the recipient.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
*
|
||
|
|
* data [in] - The session handle.
|
||
|
|
* authzid [in] - The authorization identity if some.
|
||
|
|
* chlg [in] - The optional challenge message.
|
||
|
|
* krb5 [in/out] - The Kerberos 5 data struct being used and modified.
|
||
|
|
* out [out] - The result storage.
|
||
|
|
*
|
||
|
|
* Returns CURLE_OK on success.
|
||
|
|
*/
|
||
|
|
CURLcode Curl_auth_create_gssapi_security_message(struct Curl_easy *data,
|
||
|
|
const char *authzid,
|
||
|
|
const struct bufref *chlg,
|
||
|
|
struct kerberos5data *krb5,
|
||
|
|
struct bufref *out)
|
||
|
|
{
|
||
|
|
size_t offset = 0;
|
||
|
|
size_t messagelen = 0;
|
||
|
|
size_t appdatalen = 0;
|
||
|
|
unsigned char *trailer = NULL;
|
||
|
|
unsigned char *message = NULL;
|
||
|
|
unsigned char *padding = NULL;
|
||
|
|
unsigned char *appdata = NULL;
|
||
|
|
SecBuffer input_buf[2];
|
||
|
|
SecBuffer wrap_buf[3];
|
||
|
|
SecBufferDesc input_desc;
|
||
|
|
SecBufferDesc wrap_desc;
|
||
|
|
unsigned char *indata;
|
||
|
|
unsigned long qop = 0;
|
||
|
|
unsigned long sec_layer = 0;
|
||
|
|
unsigned long max_size = 0;
|
||
|
|
SecPkgContext_Sizes sizes;
|
||
|
|
SECURITY_STATUS status;
|
||
|
|
|
||
|
|
#if defined(CURL_DISABLE_VERBOSE_STRINGS)
|
||
|
|
(void) data;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Ensure we have a valid challenge message */
|
||
|
|
if(!Curl_bufref_len(chlg)) {
|
||
|
|
infof(data, "GSSAPI handshake failure (empty security message)");
|
||
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get our response size information */
|
||
|
|
status = s_pSecFn->QueryContextAttributes(krb5->context,
|
||
|
|
SECPKG_ATTR_SIZES,
|
||
|
|
&sizes);
|
||
|
|
|
||
|
|
if(status == SEC_E_INSUFFICIENT_MEMORY)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
if(status != SEC_E_OK)
|
||
|
|
return CURLE_AUTH_ERROR;
|
||
|
|
|
||
|
|
/* Setup the "input" security buffer */
|
||
|
|
input_desc.ulVersion = SECBUFFER_VERSION;
|
||
|
|
input_desc.cBuffers = 2;
|
||
|
|
input_desc.pBuffers = input_buf;
|
||
|
|
input_buf[0].BufferType = SECBUFFER_STREAM;
|
||
|
|
input_buf[0].pvBuffer = (void *) Curl_bufref_ptr(chlg);
|
||
|
|
input_buf[0].cbBuffer = curlx_uztoul(Curl_bufref_len(chlg));
|
||
|
|
input_buf[1].BufferType = SECBUFFER_DATA;
|
||
|
|
input_buf[1].pvBuffer = NULL;
|
||
|
|
input_buf[1].cbBuffer = 0;
|
||
|
|
|
||
|
|
/* Decrypt the inbound challenge and obtain the qop */
|
||
|
|
status = s_pSecFn->DecryptMessage(krb5->context, &input_desc, 0, &qop);
|
||
|
|
if(status != SEC_E_OK) {
|
||
|
|
infof(data, "GSSAPI handshake failure (empty security message)");
|
||
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Not 4 octets long so fail as per RFC4752 Section 3.1 */
|
||
|
|
if(input_buf[1].cbBuffer != 4) {
|
||
|
|
infof(data, "GSSAPI handshake failure (invalid security data)");
|
||
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Extract the security layer and the maximum message size */
|
||
|
|
indata = input_buf[1].pvBuffer;
|
||
|
|
sec_layer = indata[0];
|
||
|
|
max_size = ((unsigned long)indata[1] << 16) |
|
||
|
|
((unsigned long)indata[2] << 8) | indata[3];
|
||
|
|
|
||
|
|
/* Free the challenge as it is not required anymore */
|
||
|
|
s_pSecFn->FreeContextBuffer(input_buf[1].pvBuffer);
|
||
|
|
|
||
|
|
/* Process the security layer */
|
||
|
|
if(!(sec_layer & KERB_WRAP_NO_ENCRYPT)) {
|
||
|
|
infof(data, "GSSAPI handshake failure (invalid security layer)");
|
||
|
|
return CURLE_BAD_CONTENT_ENCODING;
|
||
|
|
}
|
||
|
|
sec_layer &= KERB_WRAP_NO_ENCRYPT; /* We do not support a security layer */
|
||
|
|
|
||
|
|
/* Process the maximum message size the server can receive */
|
||
|
|
if(max_size > 0) {
|
||
|
|
/* The server has told us it supports a maximum receive buffer, however, as
|
||
|
|
we don't require one unless we are encrypting data, we tell the server
|
||
|
|
our receive buffer is zero. */
|
||
|
|
max_size = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Allocate the trailer */
|
||
|
|
trailer = malloc(sizes.cbSecurityTrailer);
|
||
|
|
if(!trailer)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
/* Allocate our message */
|
||
|
|
messagelen = 4;
|
||
|
|
if(authzid)
|
||
|
|
messagelen += strlen(authzid);
|
||
|
|
message = malloc(messagelen);
|
||
|
|
if(!message) {
|
||
|
|
free(trailer);
|
||
|
|
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Populate the message with the security layer and client supported receive
|
||
|
|
message size. */
|
||
|
|
message[0] = sec_layer & 0xFF;
|
||
|
|
message[1] = (max_size >> 16) & 0xFF;
|
||
|
|
message[2] = (max_size >> 8) & 0xFF;
|
||
|
|
message[3] = max_size & 0xFF;
|
||
|
|
|
||
|
|
/* If given, append the authorization identity. */
|
||
|
|
|
||
|
|
if(authzid && *authzid)
|
||
|
|
memcpy(message + 4, authzid, messagelen - 4);
|
||
|
|
|
||
|
|
/* Allocate the padding */
|
||
|
|
padding = malloc(sizes.cbBlockSize);
|
||
|
|
if(!padding) {
|
||
|
|
free(message);
|
||
|
|
free(trailer);
|
||
|
|
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Setup the "authentication data" security buffer */
|
||
|
|
wrap_desc.ulVersion = SECBUFFER_VERSION;
|
||
|
|
wrap_desc.cBuffers = 3;
|
||
|
|
wrap_desc.pBuffers = wrap_buf;
|
||
|
|
wrap_buf[0].BufferType = SECBUFFER_TOKEN;
|
||
|
|
wrap_buf[0].pvBuffer = trailer;
|
||
|
|
wrap_buf[0].cbBuffer = sizes.cbSecurityTrailer;
|
||
|
|
wrap_buf[1].BufferType = SECBUFFER_DATA;
|
||
|
|
wrap_buf[1].pvBuffer = message;
|
||
|
|
wrap_buf[1].cbBuffer = curlx_uztoul(messagelen);
|
||
|
|
wrap_buf[2].BufferType = SECBUFFER_PADDING;
|
||
|
|
wrap_buf[2].pvBuffer = padding;
|
||
|
|
wrap_buf[2].cbBuffer = sizes.cbBlockSize;
|
||
|
|
|
||
|
|
/* Encrypt the data */
|
||
|
|
status = s_pSecFn->EncryptMessage(krb5->context, KERB_WRAP_NO_ENCRYPT,
|
||
|
|
&wrap_desc, 0);
|
||
|
|
if(status != SEC_E_OK) {
|
||
|
|
free(padding);
|
||
|
|
free(message);
|
||
|
|
free(trailer);
|
||
|
|
|
||
|
|
if(status == SEC_E_INSUFFICIENT_MEMORY)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
|
||
|
|
return CURLE_AUTH_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Allocate the encryption (wrap) buffer */
|
||
|
|
appdatalen = wrap_buf[0].cbBuffer + wrap_buf[1].cbBuffer +
|
||
|
|
wrap_buf[2].cbBuffer;
|
||
|
|
appdata = malloc(appdatalen);
|
||
|
|
if(!appdata) {
|
||
|
|
free(padding);
|
||
|
|
free(message);
|
||
|
|
free(trailer);
|
||
|
|
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Populate the encryption buffer */
|
||
|
|
memcpy(appdata, wrap_buf[0].pvBuffer, wrap_buf[0].cbBuffer);
|
||
|
|
offset += wrap_buf[0].cbBuffer;
|
||
|
|
memcpy(appdata + offset, wrap_buf[1].pvBuffer, wrap_buf[1].cbBuffer);
|
||
|
|
offset += wrap_buf[1].cbBuffer;
|
||
|
|
memcpy(appdata + offset, wrap_buf[2].pvBuffer, wrap_buf[2].cbBuffer);
|
||
|
|
|
||
|
|
/* Free all of our local buffers */
|
||
|
|
free(padding);
|
||
|
|
free(message);
|
||
|
|
free(trailer);
|
||
|
|
|
||
|
|
/* Return the response. */
|
||
|
|
Curl_bufref_set(out, appdata, appdatalen, curl_free);
|
||
|
|
return CURLE_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Curl_auth_cleanup_gssapi()
|
||
|
|
*
|
||
|
|
* This is used to clean up the GSSAPI (Kerberos V5) specific data.
|
||
|
|
*
|
||
|
|
* Parameters:
|
||
|
|
*
|
||
|
|
* krb5 [in/out] - The Kerberos 5 data struct being cleaned up.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
void Curl_auth_cleanup_gssapi(struct kerberos5data *krb5)
|
||
|
|
{
|
||
|
|
/* Free our security context */
|
||
|
|
if(krb5->context) {
|
||
|
|
s_pSecFn->DeleteSecurityContext(krb5->context);
|
||
|
|
free(krb5->context);
|
||
|
|
krb5->context = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Free our credentials handle */
|
||
|
|
if(krb5->credentials) {
|
||
|
|
s_pSecFn->FreeCredentialsHandle(krb5->credentials);
|
||
|
|
free(krb5->credentials);
|
||
|
|
krb5->credentials = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Free our identity */
|
||
|
|
Curl_sspi_free_identity(krb5->p_identity);
|
||
|
|
krb5->p_identity = NULL;
|
||
|
|
|
||
|
|
/* Free the SPN and output token */
|
||
|
|
Curl_safefree(krb5->spn);
|
||
|
|
Curl_safefree(krb5->output_token);
|
||
|
|
|
||
|
|
/* Reset any variables */
|
||
|
|
krb5->token_max = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* USE_WINDOWS_SSPI && USE_KERBEROS5 */
|