diff options
Diffstat (limited to 'Utilities/cmcurl/lib/curl_sasl.c')
| -rw-r--r-- | Utilities/cmcurl/lib/curl_sasl.c | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/curl_sasl.c b/Utilities/cmcurl/lib/curl_sasl.c new file mode 100644 index 0000000..e54e487 --- /dev/null +++ b/Utilities/cmcurl/lib/curl_sasl.c @@ -0,0 +1,630 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 2012 - 2018, 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. + * + * RFC2195 CRAM-MD5 authentication + * RFC2617 Basic and Digest Access Authentication + * RFC2831 DIGEST-MD5 authentication + * RFC4422 Simple Authentication and Security Layer (SASL) + * RFC4616 PLAIN authentication + * RFC6749 OAuth 2.0 Authorization Framework + * RFC7628 A Set of SASL Mechanisms for OAuth + * Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt> + * + ***************************************************************************/ + +#include "curl_setup.h" + +#include <curl/curl.h> +#include "urldata.h" + +#include "curl_base64.h" +#include "curl_md5.h" +#include "vauth/vauth.h" +#include "vtls/vtls.h" +#include "curl_hmac.h" +#include "curl_sasl.h" +#include "warnless.h" +#include "strtok.h" +#include "sendf.h" +#include "non-ascii.h" /* included for Curl_convert_... prototypes */ +/* The last 3 #include files should be in this order */ +#include "curl_printf.h" +#include "curl_memory.h" +#include "memdebug.h" + +/* Supported mechanisms */ +static const struct { + const char *name; /* Name */ + size_t len; /* Name length */ + unsigned int bit; /* Flag bit */ +} mechtable[] = { + { "LOGIN", 5, SASL_MECH_LOGIN }, + { "PLAIN", 5, SASL_MECH_PLAIN }, + { "CRAM-MD5", 8, SASL_MECH_CRAM_MD5 }, + { "DIGEST-MD5", 10, SASL_MECH_DIGEST_MD5 }, + { "GSSAPI", 6, SASL_MECH_GSSAPI }, + { "EXTERNAL", 8, SASL_MECH_EXTERNAL }, + { "NTLM", 4, SASL_MECH_NTLM }, + { "XOAUTH2", 7, SASL_MECH_XOAUTH2 }, + { "OAUTHBEARER", 11, SASL_MECH_OAUTHBEARER }, + { ZERO_NULL, 0, 0 } +}; + +/* + * Curl_sasl_cleanup() + * + * This is used to cleanup any libraries or curl modules used by the sasl + * functions. + * + * Parameters: + * + * conn [in] - The connection data. + * authused [in] - The authentication mechanism used. + */ +void Curl_sasl_cleanup(struct connectdata *conn, unsigned int authused) +{ +#if defined(USE_KERBEROS5) + /* Cleanup the gssapi structure */ + if(authused == SASL_MECH_GSSAPI) { + Curl_auth_gssapi_cleanup(&conn->krb5); + } +#endif + +#if defined(USE_NTLM) + /* Cleanup the NTLM structure */ + if(authused == SASL_MECH_NTLM) { + Curl_auth_ntlm_cleanup(&conn->ntlm); + } +#endif + +#if !defined(USE_KERBEROS5) && !defined(USE_NTLM) + /* Reserved for future use */ + (void)conn; + (void)authused; +#endif +} + +/* + * Curl_sasl_decode_mech() + * + * Convert a SASL mechanism name into a token. + * + * Parameters: + * + * ptr [in] - The mechanism string. + * maxlen [in] - Maximum mechanism string length. + * len [out] - If not NULL, effective name length. + * + * Returns the SASL mechanism token or 0 if no match. + */ +unsigned int Curl_sasl_decode_mech(const char *ptr, size_t maxlen, size_t *len) +{ + unsigned int i; + char c; + + for(i = 0; mechtable[i].name; i++) { + if(maxlen >= mechtable[i].len && + !memcmp(ptr, mechtable[i].name, mechtable[i].len)) { + if(len) + *len = mechtable[i].len; + + if(maxlen == mechtable[i].len) + return mechtable[i].bit; + + c = ptr[mechtable[i].len]; + if(!ISUPPER(c) && !ISDIGIT(c) && c != '-' && c != '_') + return mechtable[i].bit; + } + } + + return 0; +} + +/* + * Curl_sasl_parse_url_auth_option() + * + * Parse the URL login options. + */ +CURLcode Curl_sasl_parse_url_auth_option(struct SASL *sasl, + const char *value, size_t len) +{ + CURLcode result = CURLE_OK; + unsigned int mechbit; + size_t mechlen; + + if(!len) + return CURLE_URL_MALFORMAT; + + if(sasl->resetprefs) { + sasl->resetprefs = FALSE; + sasl->prefmech = SASL_AUTH_NONE; + } + + if(!strncmp(value, "*", len)) + sasl->prefmech = SASL_AUTH_DEFAULT; + else { + mechbit = Curl_sasl_decode_mech(value, len, &mechlen); + if(mechbit && mechlen == len) + sasl->prefmech |= mechbit; + else + result = CURLE_URL_MALFORMAT; + } + + return result; +} + +/* + * Curl_sasl_init() + * + * Initializes the SASL structure. + */ +void Curl_sasl_init(struct SASL *sasl, const struct SASLproto *params) +{ + sasl->params = params; /* Set protocol dependent parameters */ + sasl->state = SASL_STOP; /* Not yet running */ + sasl->authmechs = SASL_AUTH_NONE; /* No known authentication mechanism yet */ + sasl->prefmech = SASL_AUTH_DEFAULT; /* Prefer all mechanisms */ + sasl->authused = SASL_AUTH_NONE; /* No the authentication mechanism used */ + sasl->resetprefs = TRUE; /* Reset prefmech upon AUTH parsing. */ + sasl->mutual_auth = FALSE; /* No mutual authentication (GSSAPI only) */ + sasl->force_ir = FALSE; /* Respect external option */ +} + +/* + * state() + * + * This is the ONLY way to change SASL state! + */ +static void state(struct SASL *sasl, struct connectdata *conn, + saslstate newstate) +{ +#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS) + /* for debug purposes */ + static const char * const names[]={ + "STOP", + "PLAIN", + "LOGIN", + "LOGIN_PASSWD", + "EXTERNAL", + "CRAMMD5", + "DIGESTMD5", + "DIGESTMD5_RESP", + "NTLM", + "NTLM_TYPE2MSG", + "GSSAPI", + "GSSAPI_TOKEN", + "GSSAPI_NO_DATA", + "OAUTH2", + "OAUTH2_RESP", + "CANCEL", + "FINAL", + /* LAST */ + }; + + if(sasl->state != newstate) + infof(conn->data, "SASL %p state change from %s to %s\n", + (void *)sasl, names[sasl->state], names[newstate]); +#else + (void) conn; +#endif + + sasl->state = newstate; +} + +/* + * Curl_sasl_can_authenticate() + * + * Check if we have enough auth data and capabilities to authenticate. + */ +bool Curl_sasl_can_authenticate(struct SASL *sasl, struct connectdata *conn) +{ + /* Have credentials been provided? */ + if(conn->bits.user_passwd) + return TRUE; + + /* EXTERNAL can authenticate without a user name and/or password */ + if(sasl->authmechs & sasl->prefmech & SASL_MECH_EXTERNAL) + return TRUE; + + return FALSE; +} + +/* + * Curl_sasl_start() + * + * Calculate the required login details for SASL authentication. + */ +CURLcode Curl_sasl_start(struct SASL *sasl, struct connectdata *conn, + bool force_ir, saslprogress *progress) +{ + CURLcode result = CURLE_OK; + struct Curl_easy *data = conn->data; + unsigned int enabledmechs; + const char *mech = NULL; + char *resp = NULL; + size_t len = 0; + saslstate state1 = SASL_STOP; + saslstate state2 = SASL_FINAL; + const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : + conn->host.name; + const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port; +#if defined(USE_KERBEROS5) || defined(USE_NTLM) + const char *service = data->set.str[STRING_SERVICE_NAME] ? + data->set.str[STRING_SERVICE_NAME] : + sasl->params->service; +#endif + + sasl->force_ir = force_ir; /* Latch for future use */ + sasl->authused = 0; /* No mechanism used yet */ + enabledmechs = sasl->authmechs & sasl->prefmech; + *progress = SASL_IDLE; + + /* Calculate the supported authentication mechanism, by decreasing order of + security, as well as the initial response where appropriate */ + if((enabledmechs & SASL_MECH_EXTERNAL) && !conn->passwd[0]) { + mech = SASL_MECH_STRING_EXTERNAL; + state1 = SASL_EXTERNAL; + sasl->authused = SASL_MECH_EXTERNAL; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_external_message(data, conn->user, &resp, + &len); + } + else if(conn->bits.user_passwd) { +#if defined(USE_KERBEROS5) + if((enabledmechs & SASL_MECH_GSSAPI) && Curl_auth_is_gssapi_supported() && + Curl_auth_user_contains_domain(conn->user)) { + sasl->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */ + mech = SASL_MECH_STRING_GSSAPI; + state1 = SASL_GSSAPI; + state2 = SASL_GSSAPI_TOKEN; + sasl->authused = SASL_MECH_GSSAPI; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_gssapi_user_message(data, conn->user, + conn->passwd, + service, + data->easy_conn-> + host.name, + sasl->mutual_auth, + NULL, &conn->krb5, + &resp, &len); + } + else +#endif +#ifndef CURL_DISABLE_CRYPTO_AUTH + if((enabledmechs & SASL_MECH_DIGEST_MD5) && + Curl_auth_is_digest_supported()) { + mech = SASL_MECH_STRING_DIGEST_MD5; + state1 = SASL_DIGESTMD5; + sasl->authused = SASL_MECH_DIGEST_MD5; + } + else if(enabledmechs & SASL_MECH_CRAM_MD5) { + mech = SASL_MECH_STRING_CRAM_MD5; + state1 = SASL_CRAMMD5; + sasl->authused = SASL_MECH_CRAM_MD5; + } + else +#endif +#ifdef USE_NTLM + if((enabledmechs & SASL_MECH_NTLM) && Curl_auth_is_ntlm_supported()) { + mech = SASL_MECH_STRING_NTLM; + state1 = SASL_NTLM; + state2 = SASL_NTLM_TYPE2MSG; + sasl->authused = SASL_MECH_NTLM; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_ntlm_type1_message(data, + conn->user, conn->passwd, + service, + hostname, + &conn->ntlm, &resp, + &len); + } + else +#endif + if((enabledmechs & SASL_MECH_OAUTHBEARER) && conn->oauth_bearer) { + mech = SASL_MECH_STRING_OAUTHBEARER; + state1 = SASL_OAUTH2; + state2 = SASL_OAUTH2_RESP; + sasl->authused = SASL_MECH_OAUTHBEARER; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_oauth_bearer_message(data, conn->user, + hostname, + port, + conn->oauth_bearer, + &resp, &len); + } + else if((enabledmechs & SASL_MECH_XOAUTH2) && conn->oauth_bearer) { + mech = SASL_MECH_STRING_XOAUTH2; + state1 = SASL_OAUTH2; + sasl->authused = SASL_MECH_XOAUTH2; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_oauth_bearer_message(data, conn->user, + NULL, 0, + conn->oauth_bearer, + &resp, &len); + } + else if(enabledmechs & SASL_MECH_PLAIN) { + mech = SASL_MECH_STRING_PLAIN; + state1 = SASL_PLAIN; + sasl->authused = SASL_MECH_PLAIN; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_plain_message(data, conn->user, conn->passwd, + &resp, &len); + } + else if(enabledmechs & SASL_MECH_LOGIN) { + mech = SASL_MECH_STRING_LOGIN; + state1 = SASL_LOGIN; + state2 = SASL_LOGIN_PASSWD; + sasl->authused = SASL_MECH_LOGIN; + + if(force_ir || data->set.sasl_ir) + result = Curl_auth_create_login_message(data, conn->user, &resp, &len); + } + } + + if(!result && mech) { + if(resp && sasl->params->maxirlen && + strlen(mech) + len > sasl->params->maxirlen) { + free(resp); + resp = NULL; + } + + result = sasl->params->sendauth(conn, mech, resp); + if(!result) { + *progress = SASL_INPROGRESS; + state(sasl, conn, resp ? state2 : state1); + } + } + + free(resp); + + return result; +} + +/* + * Curl_sasl_continue() + * + * Continue the authentication. + */ +CURLcode Curl_sasl_continue(struct SASL *sasl, struct connectdata *conn, + int code, saslprogress *progress) +{ + CURLcode result = CURLE_OK; + struct Curl_easy *data = conn->data; + saslstate newstate = SASL_FINAL; + char *resp = NULL; + const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name : + conn->host.name; + const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port; +#if !defined(CURL_DISABLE_CRYPTO_AUTH) + char *chlg = NULL; + size_t chlglen = 0; +#endif +#if !defined(CURL_DISABLE_CRYPTO_AUTH) || defined(USE_KERBEROS5) || \ + defined(USE_NTLM) + const char *service = data->set.str[STRING_SERVICE_NAME] ? + data->set.str[STRING_SERVICE_NAME] : + sasl->params->service; + char *serverdata; +#endif + size_t len = 0; + + *progress = SASL_INPROGRESS; + + if(sasl->state == SASL_FINAL) { + if(code != sasl->params->finalcode) + result = CURLE_LOGIN_DENIED; + *progress = SASL_DONE; + state(sasl, conn, SASL_STOP); + return result; + } + + if(sasl->state != SASL_CANCEL && sasl->state != SASL_OAUTH2_RESP && + code != sasl->params->contcode) { + *progress = SASL_DONE; + state(sasl, conn, SASL_STOP); + return CURLE_LOGIN_DENIED; + } + + switch(sasl->state) { + case SASL_STOP: + *progress = SASL_DONE; + return result; + case SASL_PLAIN: + result = Curl_auth_create_plain_message(data, conn->user, conn->passwd, + &resp, + &len); + break; + case SASL_LOGIN: + result = Curl_auth_create_login_message(data, conn->user, &resp, &len); + newstate = SASL_LOGIN_PASSWD; + break; + case SASL_LOGIN_PASSWD: + result = Curl_auth_create_login_message(data, conn->passwd, &resp, &len); + break; + case SASL_EXTERNAL: + result = Curl_auth_create_external_message(data, conn->user, &resp, &len); + break; + +#ifndef CURL_DISABLE_CRYPTO_AUTH + case SASL_CRAMMD5: + sasl->params->getmessage(data->state.buffer, &serverdata); + result = Curl_auth_decode_cram_md5_message(serverdata, &chlg, &chlglen); + if(!result) + result = Curl_auth_create_cram_md5_message(data, chlg, conn->user, + conn->passwd, &resp, &len); + free(chlg); + break; + case SASL_DIGESTMD5: + sasl->params->getmessage(data->state.buffer, &serverdata); + result = Curl_auth_create_digest_md5_message(data, serverdata, + conn->user, conn->passwd, + service, + &resp, &len); + newstate = SASL_DIGESTMD5_RESP; + break; + case SASL_DIGESTMD5_RESP: + resp = strdup(""); + if(!resp) + result = CURLE_OUT_OF_MEMORY; + break; +#endif + +#ifdef USE_NTLM + case SASL_NTLM: + /* Create the type-1 message */ + result = Curl_auth_create_ntlm_type1_message(data, + conn->user, conn->passwd, + service, hostname, + &conn->ntlm, &resp, &len); + newstate = SASL_NTLM_TYPE2MSG; + break; + case SASL_NTLM_TYPE2MSG: + /* Decode the type-2 message */ + sasl->params->getmessage(data->state.buffer, &serverdata); + result = Curl_auth_decode_ntlm_type2_message(data, serverdata, + &conn->ntlm); + if(!result) + result = Curl_auth_create_ntlm_type3_message(data, conn->user, + conn->passwd, &conn->ntlm, + &resp, &len); + break; +#endif + +#if defined(USE_KERBEROS5) + case SASL_GSSAPI: + result = Curl_auth_create_gssapi_user_message(data, conn->user, + conn->passwd, + service, + data->easy_conn->host.name, + sasl->mutual_auth, NULL, + &conn->krb5, + &resp, &len); + newstate = SASL_GSSAPI_TOKEN; + break; + case SASL_GSSAPI_TOKEN: + sasl->params->getmessage(data->state.buffer, &serverdata); + if(sasl->mutual_auth) { + /* Decode the user token challenge and create the optional response + message */ + result = Curl_auth_create_gssapi_user_message(data, NULL, NULL, + NULL, NULL, + sasl->mutual_auth, + serverdata, &conn->krb5, + &resp, &len); + newstate = SASL_GSSAPI_NO_DATA; + } + else + /* Decode the security challenge and create the response message */ + result = Curl_auth_create_gssapi_security_message(data, serverdata, + &conn->krb5, + &resp, &len); + break; + case SASL_GSSAPI_NO_DATA: + sasl->params->getmessage(data->state.buffer, &serverdata); + /* Decode the security challenge and create the response message */ + result = Curl_auth_create_gssapi_security_message(data, serverdata, + &conn->krb5, + &resp, &len); + break; +#endif + + case SASL_OAUTH2: + /* Create the authorisation message */ + if(sasl->authused == SASL_MECH_OAUTHBEARER) { + result = Curl_auth_create_oauth_bearer_message(data, conn->user, + hostname, + port, + conn->oauth_bearer, + &resp, &len); + + /* Failures maybe sent by the server as continuations for OAUTHBEARER */ + newstate = SASL_OAUTH2_RESP; + } + else + result = Curl_auth_create_oauth_bearer_message(data, conn->user, + NULL, 0, + conn->oauth_bearer, + &resp, &len); + break; + + case SASL_OAUTH2_RESP: + /* The continuation is optional so check the response code */ + if(code == sasl->params->finalcode) { + /* Final response was received so we are done */ + *progress = SASL_DONE; + state(sasl, conn, SASL_STOP); + return result; + } + else if(code == sasl->params->contcode) { + /* Acknowledge the continuation by sending a 0x01 response base64 + encoded */ + resp = strdup("AQ=="); + if(!resp) + result = CURLE_OUT_OF_MEMORY; + break; + } + else { + *progress = SASL_DONE; + state(sasl, conn, SASL_STOP); + return CURLE_LOGIN_DENIED; + } + + case SASL_CANCEL: + /* Remove the offending mechanism from the supported list */ + sasl->authmechs ^= sasl->authused; + + /* Start an alternative SASL authentication */ + result = Curl_sasl_start(sasl, conn, sasl->force_ir, progress); + newstate = sasl->state; /* Use state from Curl_sasl_start() */ + break; + default: + failf(data, "Unsupported SASL authentication mechanism"); + result = CURLE_UNSUPPORTED_PROTOCOL; /* Should not happen */ + break; + } + + switch(result) { + case CURLE_BAD_CONTENT_ENCODING: + /* Cancel dialog */ + result = sasl->params->sendcont(conn, "*"); + newstate = SASL_CANCEL; + break; + case CURLE_OK: + if(resp) + result = sasl->params->sendcont(conn, resp); + break; + default: + newstate = SASL_STOP; /* Stop on error */ + *progress = SASL_DONE; + break; + } + + free(resp); + + state(sasl, conn, newstate); + + return result; +} |