#include "curl_setup.h"
#if defined(USE_WINDOWS_SSPI) && defined(USE_KERBEROS5)
#include <curl/curl.h>
#include "vauth/vauth.h"
#include "urldata.h"
#include "curl_base64.h"
#include "warnless.h"
#include "curl_multibyte.h"
#include "sendf.h"
#include "curl_memory.h"
#include "memdebug.h"
bool Curl_auth_is_gssapi_supported(void)
{
PSecPkgInfo SecurityPackage;
SECURITY_STATUS status;
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
TEXT(SP_NAME_KERBEROS),
&SecurityPackage);
return (status == SEC_E_OK ? TRUE : FALSE);
}
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 char *chlg64,
struct kerberos5data *krb5,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t chlglen = 0;
unsigned char *chlg = NULL;
CtxtHandle context;
PSecPkgInfo SecurityPackage;
SecBuffer chlg_buf;
SecBuffer resp_buf;
SecBufferDesc chlg_desc;
SecBufferDesc resp_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp expiry;
if(!krb5->spn) {
krb5->spn = Curl_auth_build_spn(service, host, NULL);
if(!krb5->spn)
return CURLE_OUT_OF_MEMORY;
}
if(!krb5->output_token) {
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
TEXT(SP_NAME_KERBEROS),
&SecurityPackage);
if(status != SEC_E_OK) {
return CURLE_NOT_BUILT_IN;
}
krb5->token_max = SecurityPackage->cbMaxToken;
s_pSecFn->FreeContextBuffer(SecurityPackage);
krb5->output_token = malloc(krb5->token_max);
if(!krb5->output_token)
return CURLE_OUT_OF_MEMORY;
}
if(!krb5->credentials) {
if(userp && *userp) {
result = Curl_create_sspi_identity(userp, passwdp, &krb5->identity);
if(result)
return result;
krb5->p_identity = &krb5->identity;
}
else
krb5->p_identity = NULL;
krb5->credentials = calloc(1, sizeof(CredHandle));
if(!krb5->credentials)
return CURLE_OUT_OF_MEMORY;
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;
krb5->context = calloc(1, sizeof(CtxtHandle));
if(!krb5->context)
return CURLE_OUT_OF_MEMORY;
}
if(chlg64 && *chlg64) {
if(*chlg64 != '=') {
result = Curl_base64_decode(chlg64, &chlg, &chlglen);
if(result)
return result;
}
if(!chlg) {
infof(data, "GSSAPI handshake failure (empty challenge message)\n");
return CURLE_BAD_CONTENT_ENCODING;
}
chlg_desc.ulVersion = SECBUFFER_VERSION;
chlg_desc.cBuffers = 1;
chlg_desc.pBuffers = &chlg_buf;
chlg_buf.BufferType = SECBUFFER_TOKEN;
chlg_buf.pvBuffer = chlg;
chlg_buf.cbBuffer = curlx_uztoul(chlglen);
}
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);
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);
free(chlg);
if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
return CURLE_RECV_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_base64_encode(data, (char *) resp_buf.pvBuffer,
resp_buf.cbBuffer, outptr, outlen);
}
else if(mutual_auth) {
*outptr = strdup("");
if(!*outptr)
result = CURLE_OUT_OF_MEMORY;
}
return result;
}
CURLcode Curl_auth_create_gssapi_security_message(struct Curl_easy *data,
const char *chlg64,
struct kerberos5data *krb5,
char **outptr,
size_t *outlen)
{
CURLcode result = CURLE_OK;
size_t offset = 0;
size_t chlglen = 0;
size_t messagelen = 0;
size_t appdatalen = 0;
unsigned char *chlg = NULL;
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 long indata = 0;
unsigned long outdata = 0;
unsigned long qop = 0;
unsigned long sec_layer = 0;
unsigned long max_size = 0;
SecPkgContext_Sizes sizes;
SecPkgCredentials_Names names;
SECURITY_STATUS status;
char *user_name;
if(strlen(chlg64) && *chlg64 != '=') {
result = Curl_base64_decode(chlg64, &chlg, &chlglen);
if(result)
return result;
}
if(!chlg) {
infof(data, "GSSAPI handshake failure (empty security message)\n");
return CURLE_BAD_CONTENT_ENCODING;
}
status = s_pSecFn->QueryContextAttributes(krb5->context,
SECPKG_ATTR_SIZES,
&sizes);
if(status != SEC_E_OK) {
free(chlg);
return CURLE_OUT_OF_MEMORY;
}
status = s_pSecFn->QueryCredentialsAttributes(krb5->credentials,
SECPKG_CRED_ATTR_NAMES,
&names);
if(status != SEC_E_OK) {
free(chlg);
return CURLE_RECV_ERROR;
}
input_desc.ulVersion = SECBUFFER_VERSION;
input_desc.cBuffers = 2;
input_desc.pBuffers = input_buf;
input_buf[0].BufferType = SECBUFFER_STREAM;
input_buf[0].pvBuffer = chlg;
input_buf[0].cbBuffer = curlx_uztoul(chlglen);
input_buf[1].BufferType = SECBUFFER_DATA;
input_buf[1].pvBuffer = NULL;
input_buf[1].cbBuffer = 0;
status = s_pSecFn->DecryptMessage(krb5->context, &input_desc, 0, &qop);
if(status != SEC_E_OK) {
infof(data, "GSSAPI handshake failure (empty security message)\n");
free(chlg);
return CURLE_BAD_CONTENT_ENCODING;
}
if(input_buf[1].cbBuffer != 4) {
infof(data, "GSSAPI handshake failure (invalid security data)\n");
free(chlg);
return CURLE_BAD_CONTENT_ENCODING;
}
memcpy(&indata, input_buf[1].pvBuffer, 4);
s_pSecFn->FreeContextBuffer(input_buf[1].pvBuffer);
free(chlg);
sec_layer = indata & 0x000000FF;
if(!(sec_layer & KERB_WRAP_NO_ENCRYPT)) {
infof(data, "GSSAPI handshake failure (invalid security layer)\n");
return CURLE_BAD_CONTENT_ENCODING;
}
max_size = ntohl(indata & 0xFFFFFF00);
if(max_size > 0) {
max_size = 0;
}
trailer = malloc(sizes.cbSecurityTrailer);
if(!trailer)
return CURLE_OUT_OF_MEMORY;
user_name = Curl_convert_tchar_to_UTF8(names.sUserName);
if(!user_name) {
free(trailer);
return CURLE_OUT_OF_MEMORY;
}
messagelen = sizeof(outdata) + strlen(user_name) + 1;
message = malloc(messagelen);
if(!message) {
free(trailer);
Curl_unicodefree(user_name);
return CURLE_OUT_OF_MEMORY;
}
outdata = htonl(max_size) | sec_layer;
memcpy(message, &outdata, sizeof(outdata));
strcpy((char *) message + sizeof(outdata), user_name);
Curl_unicodefree(user_name);
padding = malloc(sizes.cbBlockSize);
if(!padding) {
free(message);
free(trailer);
return CURLE_OUT_OF_MEMORY;
}
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;
status = s_pSecFn->EncryptMessage(krb5->context, KERB_WRAP_NO_ENCRYPT,
&wrap_desc, 0);
if(status != SEC_E_OK) {
free(padding);
free(message);
free(trailer);
return CURLE_OUT_OF_MEMORY;
}
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;
}
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);
result = Curl_base64_encode(data, (char *) appdata, appdatalen, outptr,
outlen);
free(appdata);
free(padding);
free(message);
free(trailer);
return result;
}
void Curl_auth_gssapi_cleanup(struct kerberos5data *krb5)
{
if(krb5->context) {
s_pSecFn->DeleteSecurityContext(krb5->context);
free(krb5->context);
krb5->context = NULL;
}
if(krb5->credentials) {
s_pSecFn->FreeCredentialsHandle(krb5->credentials);
free(krb5->credentials);
krb5->credentials = NULL;
}
Curl_sspi_free_identity(krb5->p_identity);
krb5->p_identity = NULL;
Curl_safefree(krb5->spn);
Curl_safefree(krb5->output_token);
krb5->token_max = 0;
}
#endif