/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 2014 - 2016, Steve Holme, . * Copyright (C) 2015, Daniel Stenberg, , 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. * * RFC2831 DIGEST-MD5 authentication * ***************************************************************************/ #include "curl_setup.h" #if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_CRYPTO_AUTH) #include #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_auth_is_digest_supported() * * This is used to evaluate if DIGEST is supported. * * Parameters: None * * Returns TRUE if DIGEST is supported by Windows SSPI. */ bool Curl_auth_is_digest_supported(void) { PSecPkgInfo SecurityPackage; SECURITY_STATUS status; /* Query the security package for Digest */ status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST), &SecurityPackage); return (status == SEC_E_OK ? TRUE : FALSE); } /* * Curl_auth_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 http, 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_auth_create_digest_md5_message(struct Curl_easy *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_auth_build_spn(service, data->easy_conn->host.name, NULL); 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_auth_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_auth_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_auth_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_auth_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_auth_create_digest_http_message(struct Curl_easy *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); 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); return CURLE_LOGIN_DENIED; } /* Allocate the output buffer according to the max token size as indicated by the security package */ output_token = malloc(token_max); if(!output_token) { s_pSecFn->FreeCredentialsHandle(&credentials); Curl_sspi_free_identity(p_identity); return CURLE_OUT_OF_MEMORY; } /* 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) { s_pSecFn->FreeCredentialsHandle(&credentials); 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_auth_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_auth_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 */