| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, 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 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. |
| * |
| * RFC4178 Simple and Protected GSS-API Negotiation Mechanism |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #if defined(USE_WINDOWS_SSPI) && defined(USE_SPNEGO) |
| |
| #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 "strerror.h" |
| |
| /* The last #include files should be: */ |
| #include "curl_memory.h" |
| #include "memdebug.h" |
| |
| /* |
| * Curl_auth_is_spnego_supported() |
| * |
| * This is used to evaluate if SPNEGO (Negotiate) is supported. |
| * |
| * Parameters: None |
| * |
| * Returns TRUE if Negotiate is supported by Windows SSPI. |
| */ |
| bool Curl_auth_is_spnego_supported(void) |
| { |
| PSecPkgInfo SecurityPackage; |
| SECURITY_STATUS status; |
| |
| /* Query the security package for Negotiate */ |
| status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) |
| TEXT(SP_NAME_NEGOTIATE), |
| &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_decode_spnego_message() |
| * |
| * This is used to decode an already encoded SPNEGO (Negotiate) challenge |
| * message. |
| * |
| * Parameters: |
| * |
| * data [in] - The session handle. |
| * user [in] - The user name in the format User or Domain\User. |
| * password [in] - The user's password. |
| * service [in] - The service type such as http, smtp, pop or imap. |
| * host [in] - The host name. |
| * chlg64 [in] - The optional base64 encoded challenge message. |
| * nego [in/out] - The Negotiate data struct being used and modified. |
| * |
| * Returns CURLE_OK on success. |
| */ |
| CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data, |
| const char *user, |
| const char *password, |
| const char *service, |
| const char *host, |
| const char *chlg64, |
| struct negotiatedata *nego) |
| { |
| CURLcode result = CURLE_OK; |
| size_t chlglen = 0; |
| unsigned char *chlg = NULL; |
| PSecPkgInfo SecurityPackage; |
| SecBuffer chlg_buf[2]; |
| SecBuffer resp_buf; |
| SecBufferDesc chlg_desc; |
| SecBufferDesc resp_desc; |
| unsigned long attrs; |
| TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */ |
| |
| #if defined(CURL_DISABLE_VERBOSE_STRINGS) |
| (void) data; |
| #endif |
| |
| if(nego->context && nego->status == SEC_E_OK) { |
| /* We finished successfully our part of authentication, but server |
| * rejected it (since we're again here). Exit with an error since we |
| * can't invent anything better */ |
| Curl_auth_cleanup_spnego(nego); |
| return CURLE_LOGIN_DENIED; |
| } |
| |
| if(!nego->spn) { |
| /* Generate our SPN */ |
| nego->spn = Curl_auth_build_spn(service, host, NULL); |
| if(!nego->spn) |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| if(!nego->output_token) { |
| /* Query the security package for Negotiate */ |
| nego->status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) |
| TEXT(SP_NAME_NEGOTIATE), |
| &SecurityPackage); |
| if(nego->status != SEC_E_OK) { |
| failf(data, "SSPI: couldn't get auth info"); |
| return CURLE_AUTH_ERROR; |
| } |
| |
| nego->token_max = SecurityPackage->cbMaxToken; |
| |
| /* Release the package buffer as it is not required anymore */ |
| s_pSecFn->FreeContextBuffer(SecurityPackage); |
| |
| /* Allocate our output buffer */ |
| nego->output_token = malloc(nego->token_max); |
| if(!nego->output_token) |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| if(!nego->credentials) { |
| /* Do we have credentials to use or are we using single sign-on? */ |
| if(user && *user) { |
| /* Populate our identity structure */ |
| result = Curl_create_sspi_identity(user, password, &nego->identity); |
| if(result) |
| return result; |
| |
| /* Allow proper cleanup of the identity structure */ |
| nego->p_identity = &nego->identity; |
| } |
| else |
| /* Use the current Windows user */ |
| nego->p_identity = NULL; |
| |
| /* Allocate our credentials handle */ |
| nego->credentials = calloc(1, sizeof(CredHandle)); |
| if(!nego->credentials) |
| return CURLE_OUT_OF_MEMORY; |
| |
| /* Acquire our credentials handle */ |
| nego->status = |
| s_pSecFn->AcquireCredentialsHandle(NULL, |
| (TCHAR *)TEXT(SP_NAME_NEGOTIATE), |
| SECPKG_CRED_OUTBOUND, NULL, |
| nego->p_identity, NULL, NULL, |
| nego->credentials, &expiry); |
| if(nego->status != SEC_E_OK) |
| return CURLE_AUTH_ERROR; |
| |
| /* Allocate our new context handle */ |
| nego->context = calloc(1, sizeof(CtxtHandle)); |
| if(!nego->context) |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| if(chlg64 && *chlg64) { |
| /* Decode the base-64 encoded challenge message */ |
| if(*chlg64 != '=') { |
| result = Curl_base64_decode(chlg64, &chlg, &chlglen); |
| if(result) |
| return result; |
| } |
| |
| /* Ensure we have a valid challenge message */ |
| if(!chlg) { |
| infof(data, "SPNEGO 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[0]; |
| chlg_buf[0].BufferType = SECBUFFER_TOKEN; |
| chlg_buf[0].pvBuffer = chlg; |
| chlg_buf[0].cbBuffer = curlx_uztoul(chlglen); |
| |
| #ifdef SECPKG_ATTR_ENDPOINT_BINDINGS |
| /* ssl context comes from Schannel. |
| * When extended protection is used in IIS server, |
| * we have to pass a second SecBuffer to the SecBufferDesc |
| * otherwise IIS will not pass the authentication (401 response). |
| * Minimum supported version is Windows 7. |
| * https://docs.microsoft.com/en-us/security-updates |
| * /SecurityAdvisories/2009/973811 |
| */ |
| if(nego->sslContext) { |
| SEC_CHANNEL_BINDINGS channelBindings; |
| SecPkgContext_Bindings pkgBindings; |
| pkgBindings.Bindings = &channelBindings; |
| nego->status = s_pSecFn->QueryContextAttributes( |
| nego->sslContext, |
| SECPKG_ATTR_ENDPOINT_BINDINGS, |
| &pkgBindings |
| ); |
| if(nego->status == SEC_E_OK) { |
| chlg_desc.cBuffers++; |
| chlg_buf[1].BufferType = SECBUFFER_CHANNEL_BINDINGS; |
| chlg_buf[1].cbBuffer = pkgBindings.BindingsLength; |
| chlg_buf[1].pvBuffer = pkgBindings.Bindings; |
| } |
| } |
| #endif |
| } |
| |
| /* 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 = nego->output_token; |
| resp_buf.cbBuffer = curlx_uztoul(nego->token_max); |
| |
| /* Generate our challenge-response message */ |
| nego->status = s_pSecFn->InitializeSecurityContext(nego->credentials, |
| chlg ? nego->context : |
| NULL, |
| nego->spn, |
| ISC_REQ_CONFIDENTIALITY, |
| 0, SECURITY_NATIVE_DREP, |
| chlg ? &chlg_desc : NULL, |
| 0, nego->context, |
| &resp_desc, &attrs, |
| &expiry); |
| |
| /* Free the decoded challenge as it is not required anymore */ |
| free(chlg); |
| |
| if(GSS_ERROR(nego->status)) { |
| char buffer[STRERROR_LEN]; |
| failf(data, "InitializeSecurityContext failed: %s", |
| Curl_sspi_strerror(nego->status, buffer, sizeof(buffer))); |
| |
| if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY) |
| return CURLE_OUT_OF_MEMORY; |
| |
| return CURLE_AUTH_ERROR; |
| } |
| |
| if(nego->status == SEC_I_COMPLETE_NEEDED || |
| nego->status == SEC_I_COMPLETE_AND_CONTINUE) { |
| nego->status = s_pSecFn->CompleteAuthToken(nego->context, &resp_desc); |
| if(GSS_ERROR(nego->status)) { |
| char buffer[STRERROR_LEN]; |
| failf(data, "CompleteAuthToken failed: %s", |
| Curl_sspi_strerror(nego->status, buffer, sizeof(buffer))); |
| |
| if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY) |
| return CURLE_OUT_OF_MEMORY; |
| |
| return CURLE_AUTH_ERROR; |
| } |
| } |
| |
| nego->output_token_length = resp_buf.cbBuffer; |
| |
| return result; |
| } |
| |
| /* |
| * Curl_auth_create_spnego_message() |
| * |
| * This is used to generate an already encoded SPNEGO (Negotiate) response |
| * message ready for sending to the recipient. |
| * |
| * Parameters: |
| * |
| * data [in] - The session handle. |
| * nego [in/out] - The Negotiate 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_auth_create_spnego_message(struct Curl_easy *data, |
| struct negotiatedata *nego, |
| char **outptr, size_t *outlen) |
| { |
| CURLcode result; |
| |
| /* Base64 encode the already generated response */ |
| result = Curl_base64_encode(data, |
| (const char *) nego->output_token, |
| nego->output_token_length, |
| outptr, outlen); |
| |
| if(result) |
| return result; |
| |
| if(!*outptr || !*outlen) { |
| free(*outptr); |
| return CURLE_REMOTE_ACCESS_DENIED; |
| } |
| |
| return CURLE_OK; |
| } |
| |
| /* |
| * Curl_auth_cleanup_spnego() |
| * |
| * This is used to clean up the SPNEGO (Negotiate) specific data. |
| * |
| * Parameters: |
| * |
| * nego [in/out] - The Negotiate data struct being cleaned up. |
| * |
| */ |
| void Curl_auth_cleanup_spnego(struct negotiatedata *nego) |
| { |
| /* Free our security context */ |
| if(nego->context) { |
| s_pSecFn->DeleteSecurityContext(nego->context); |
| free(nego->context); |
| nego->context = NULL; |
| } |
| |
| /* Free our credentials handle */ |
| if(nego->credentials) { |
| s_pSecFn->FreeCredentialsHandle(nego->credentials); |
| free(nego->credentials); |
| nego->credentials = NULL; |
| } |
| |
| /* Free our identity */ |
| Curl_sspi_free_identity(nego->p_identity); |
| nego->p_identity = NULL; |
| |
| /* Free the SPN and output token */ |
| Curl_safefree(nego->spn); |
| Curl_safefree(nego->output_token); |
| |
| /* Reset any variables */ |
| nego->status = 0; |
| nego->token_max = 0; |
| nego->noauthpersist = FALSE; |
| nego->havenoauthpersist = FALSE; |
| nego->havenegdata = FALSE; |
| nego->havemultiplerequests = FALSE; |
| } |
| |
| #endif /* USE_WINDOWS_SSPI && USE_SPNEGO */ |
