/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2016, 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 https://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. * * 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" /* 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); 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. * 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 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; 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_spnego_cleanup(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) return CURLE_NOT_BUILT_IN; 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 credientials 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 = malloc(sizeof(CredHandle)); if(!nego->credentials) return CURLE_OUT_OF_MEMORY; memset(nego->credentials, 0, sizeof(CredHandle)); /* 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_LOGIN_DENIED; /* Allocate our new context handle */ nego->context = malloc(sizeof(CtxtHandle)); if(!nego->context) return CURLE_OUT_OF_MEMORY; memset(nego->context, 0, sizeof(CtxtHandle)); } 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)\n"); 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 = chlg; 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 = 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)) { return CURLE_OUT_OF_MEMORY; } 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)) { return CURLE_RECV_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_spnego_cleanup() * * 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_spnego_cleanup(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; } #endif /* USE_WINDOWS_SSPI && USE_SPNEGO */