629 lines
20 KiB
C
629 lines
20 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* RFC2195 CRAM-MD5 authentication
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* RFC2617 Basic and Digest Access Authentication
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* RFC2831 DIGEST-MD5 authentication
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* RFC4422 Simple Authentication and Security Layer (SASL)
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* RFC4616 PLAIN authentication
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* RFC6749 OAuth 2.0 Authorization Framework
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* RFC7628 A Set of SASL Mechanisms for OAuth
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* Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include <curl/curl.h>
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#include "urldata.h"
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#include "curl_base64.h"
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#include "curl_md5.h"
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#include "vauth/vauth.h"
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#include "vtls/vtls.h"
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#include "curl_hmac.h"
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#include "curl_sasl.h"
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#include "warnless.h"
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#include "strtok.h"
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#include "sendf.h"
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#include "non-ascii.h" /* included for Curl_convert_... prototypes */
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* Supported mechanisms */
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static const struct {
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const char *name; /* Name */
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size_t len; /* Name length */
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unsigned int bit; /* Flag bit */
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} mechtable[] = {
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{ "LOGIN", 5, SASL_MECH_LOGIN },
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{ "PLAIN", 5, SASL_MECH_PLAIN },
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{ "CRAM-MD5", 8, SASL_MECH_CRAM_MD5 },
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{ "DIGEST-MD5", 10, SASL_MECH_DIGEST_MD5 },
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{ "GSSAPI", 6, SASL_MECH_GSSAPI },
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{ "EXTERNAL", 8, SASL_MECH_EXTERNAL },
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{ "NTLM", 4, SASL_MECH_NTLM },
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{ "XOAUTH2", 7, SASL_MECH_XOAUTH2 },
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{ "OAUTHBEARER", 11, SASL_MECH_OAUTHBEARER },
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{ ZERO_NULL, 0, 0 }
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};
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/*
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* Curl_sasl_cleanup()
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*
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* This is used to cleanup any libraries or curl modules used by the sasl
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* functions.
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*
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* Parameters:
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*
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* conn [in] - The connection data.
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* authused [in] - The authentication mechanism used.
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*/
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void Curl_sasl_cleanup(struct connectdata *conn, unsigned int authused)
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{
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#if defined(USE_KERBEROS5)
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/* Cleanup the gssapi structure */
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if(authused == SASL_MECH_GSSAPI) {
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Curl_auth_gssapi_cleanup(&conn->krb5);
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}
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#endif
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#if defined(USE_NTLM)
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/* Cleanup the NTLM structure */
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if(authused == SASL_MECH_NTLM) {
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Curl_auth_ntlm_cleanup(&conn->ntlm);
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}
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#endif
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#if !defined(USE_KERBEROS5) && !defined(USE_NTLM)
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/* Reserved for future use */
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(void)conn;
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(void)authused;
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#endif
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}
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/*
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* Curl_sasl_decode_mech()
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*
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* Convert a SASL mechanism name into a token.
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*
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* Parameters:
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*
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* ptr [in] - The mechanism string.
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* maxlen [in] - Maximum mechanism string length.
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* len [out] - If not NULL, effective name length.
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*
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* Returns the SASL mechanism token or 0 if no match.
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*/
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unsigned int Curl_sasl_decode_mech(const char *ptr, size_t maxlen, size_t *len)
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{
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unsigned int i;
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char c;
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for(i = 0; mechtable[i].name; i++) {
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if(maxlen >= mechtable[i].len &&
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!memcmp(ptr, mechtable[i].name, mechtable[i].len)) {
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if(len)
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*len = mechtable[i].len;
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if(maxlen == mechtable[i].len)
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return mechtable[i].bit;
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c = ptr[mechtable[i].len];
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if(!ISUPPER(c) && !ISDIGIT(c) && c != '-' && c != '_')
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return mechtable[i].bit;
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}
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}
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return 0;
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}
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/*
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* Curl_sasl_parse_url_auth_option()
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*
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* Parse the URL login options.
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*/
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CURLcode Curl_sasl_parse_url_auth_option(struct SASL *sasl,
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const char *value, size_t len)
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{
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CURLcode result = CURLE_OK;
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size_t mechlen;
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if(!len)
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return CURLE_URL_MALFORMAT;
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if(sasl->resetprefs) {
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sasl->resetprefs = FALSE;
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sasl->prefmech = SASL_AUTH_NONE;
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}
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if(!strncmp(value, "*", len))
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sasl->prefmech = SASL_AUTH_DEFAULT;
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else {
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unsigned int mechbit = Curl_sasl_decode_mech(value, len, &mechlen);
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if(mechbit && mechlen == len)
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sasl->prefmech |= mechbit;
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else
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result = CURLE_URL_MALFORMAT;
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}
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return result;
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}
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/*
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* Curl_sasl_init()
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*
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* Initializes the SASL structure.
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*/
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void Curl_sasl_init(struct SASL *sasl, const struct SASLproto *params)
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{
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sasl->params = params; /* Set protocol dependent parameters */
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sasl->state = SASL_STOP; /* Not yet running */
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sasl->authmechs = SASL_AUTH_NONE; /* No known authentication mechanism yet */
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sasl->prefmech = SASL_AUTH_DEFAULT; /* Prefer all mechanisms */
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sasl->authused = SASL_AUTH_NONE; /* No the authentication mechanism used */
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sasl->resetprefs = TRUE; /* Reset prefmech upon AUTH parsing. */
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sasl->mutual_auth = FALSE; /* No mutual authentication (GSSAPI only) */
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sasl->force_ir = FALSE; /* Respect external option */
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}
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/*
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* state()
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*
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* This is the ONLY way to change SASL state!
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*/
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static void state(struct SASL *sasl, struct connectdata *conn,
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saslstate newstate)
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{
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#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
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/* for debug purposes */
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static const char * const names[]={
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"STOP",
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"PLAIN",
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"LOGIN",
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"LOGIN_PASSWD",
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"EXTERNAL",
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"CRAMMD5",
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"DIGESTMD5",
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"DIGESTMD5_RESP",
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"NTLM",
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"NTLM_TYPE2MSG",
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"GSSAPI",
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"GSSAPI_TOKEN",
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"GSSAPI_NO_DATA",
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"OAUTH2",
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"OAUTH2_RESP",
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"CANCEL",
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"FINAL",
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/* LAST */
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};
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if(sasl->state != newstate)
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infof(conn->data, "SASL %p state change from %s to %s\n",
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(void *)sasl, names[sasl->state], names[newstate]);
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#else
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(void) conn;
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#endif
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sasl->state = newstate;
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}
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/*
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* Curl_sasl_can_authenticate()
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*
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* Check if we have enough auth data and capabilities to authenticate.
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*/
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bool Curl_sasl_can_authenticate(struct SASL *sasl, struct connectdata *conn)
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{
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/* Have credentials been provided? */
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if(conn->bits.user_passwd)
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return TRUE;
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/* EXTERNAL can authenticate without a user name and/or password */
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if(sasl->authmechs & sasl->prefmech & SASL_MECH_EXTERNAL)
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return TRUE;
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return FALSE;
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}
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/*
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* Curl_sasl_start()
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*
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* Calculate the required login details for SASL authentication.
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*/
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CURLcode Curl_sasl_start(struct SASL *sasl, struct connectdata *conn,
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bool force_ir, saslprogress *progress)
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{
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CURLcode result = CURLE_OK;
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struct Curl_easy *data = conn->data;
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unsigned int enabledmechs;
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const char *mech = NULL;
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char *resp = NULL;
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size_t len = 0;
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saslstate state1 = SASL_STOP;
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saslstate state2 = SASL_FINAL;
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const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
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conn->host.name;
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const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
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#if defined(USE_KERBEROS5) || defined(USE_NTLM)
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const char *service = data->set.str[STRING_SERVICE_NAME] ?
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data->set.str[STRING_SERVICE_NAME] :
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sasl->params->service;
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#endif
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sasl->force_ir = force_ir; /* Latch for future use */
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sasl->authused = 0; /* No mechanism used yet */
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enabledmechs = sasl->authmechs & sasl->prefmech;
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*progress = SASL_IDLE;
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/* Calculate the supported authentication mechanism, by decreasing order of
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security, as well as the initial response where appropriate */
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if((enabledmechs & SASL_MECH_EXTERNAL) && !conn->passwd[0]) {
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mech = SASL_MECH_STRING_EXTERNAL;
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state1 = SASL_EXTERNAL;
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sasl->authused = SASL_MECH_EXTERNAL;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_external_message(data, conn->user, &resp,
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&len);
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}
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else if(conn->bits.user_passwd) {
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#if defined(USE_KERBEROS5)
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if((enabledmechs & SASL_MECH_GSSAPI) && Curl_auth_is_gssapi_supported() &&
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Curl_auth_user_contains_domain(conn->user)) {
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sasl->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */
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mech = SASL_MECH_STRING_GSSAPI;
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state1 = SASL_GSSAPI;
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state2 = SASL_GSSAPI_TOKEN;
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sasl->authused = SASL_MECH_GSSAPI;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_gssapi_user_message(data, conn->user,
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conn->passwd,
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service,
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data->conn->host.name,
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sasl->mutual_auth,
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NULL, &conn->krb5,
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&resp, &len);
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}
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else
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#endif
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#ifndef CURL_DISABLE_CRYPTO_AUTH
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if((enabledmechs & SASL_MECH_DIGEST_MD5) &&
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Curl_auth_is_digest_supported()) {
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mech = SASL_MECH_STRING_DIGEST_MD5;
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state1 = SASL_DIGESTMD5;
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sasl->authused = SASL_MECH_DIGEST_MD5;
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}
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else if(enabledmechs & SASL_MECH_CRAM_MD5) {
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mech = SASL_MECH_STRING_CRAM_MD5;
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state1 = SASL_CRAMMD5;
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sasl->authused = SASL_MECH_CRAM_MD5;
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}
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else
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#endif
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#ifdef USE_NTLM
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if((enabledmechs & SASL_MECH_NTLM) && Curl_auth_is_ntlm_supported()) {
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mech = SASL_MECH_STRING_NTLM;
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state1 = SASL_NTLM;
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state2 = SASL_NTLM_TYPE2MSG;
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sasl->authused = SASL_MECH_NTLM;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_ntlm_type1_message(data,
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conn->user, conn->passwd,
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service,
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hostname,
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&conn->ntlm, &resp,
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&len);
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}
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else
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#endif
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if((enabledmechs & SASL_MECH_OAUTHBEARER) && conn->oauth_bearer) {
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mech = SASL_MECH_STRING_OAUTHBEARER;
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state1 = SASL_OAUTH2;
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state2 = SASL_OAUTH2_RESP;
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sasl->authused = SASL_MECH_OAUTHBEARER;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_oauth_bearer_message(data, conn->user,
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hostname,
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port,
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conn->oauth_bearer,
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&resp, &len);
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}
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else if((enabledmechs & SASL_MECH_XOAUTH2) && conn->oauth_bearer) {
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mech = SASL_MECH_STRING_XOAUTH2;
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state1 = SASL_OAUTH2;
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sasl->authused = SASL_MECH_XOAUTH2;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_oauth_bearer_message(data, conn->user,
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NULL, 0,
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conn->oauth_bearer,
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&resp, &len);
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}
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else if(enabledmechs & SASL_MECH_PLAIN) {
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mech = SASL_MECH_STRING_PLAIN;
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state1 = SASL_PLAIN;
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sasl->authused = SASL_MECH_PLAIN;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_plain_message(data, conn->user, conn->passwd,
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&resp, &len);
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}
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else if(enabledmechs & SASL_MECH_LOGIN) {
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mech = SASL_MECH_STRING_LOGIN;
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state1 = SASL_LOGIN;
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state2 = SASL_LOGIN_PASSWD;
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sasl->authused = SASL_MECH_LOGIN;
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if(force_ir || data->set.sasl_ir)
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result = Curl_auth_create_login_message(data, conn->user, &resp, &len);
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}
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}
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if(!result && mech) {
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if(resp && sasl->params->maxirlen &&
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strlen(mech) + len > sasl->params->maxirlen) {
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free(resp);
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resp = NULL;
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}
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result = sasl->params->sendauth(conn, mech, resp);
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if(!result) {
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*progress = SASL_INPROGRESS;
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state(sasl, conn, resp ? state2 : state1);
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}
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}
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free(resp);
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return result;
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}
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/*
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* Curl_sasl_continue()
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*
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* Continue the authentication.
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*/
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CURLcode Curl_sasl_continue(struct SASL *sasl, struct connectdata *conn,
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int code, saslprogress *progress)
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{
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CURLcode result = CURLE_OK;
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struct Curl_easy *data = conn->data;
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saslstate newstate = SASL_FINAL;
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char *resp = NULL;
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const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
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conn->host.name;
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const long int port = SSL_IS_PROXY() ? conn->port : conn->remote_port;
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#if !defined(CURL_DISABLE_CRYPTO_AUTH)
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char *chlg = NULL;
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size_t chlglen = 0;
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#endif
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#if !defined(CURL_DISABLE_CRYPTO_AUTH) || defined(USE_KERBEROS5) || \
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defined(USE_NTLM)
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const char *service = data->set.str[STRING_SERVICE_NAME] ?
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data->set.str[STRING_SERVICE_NAME] :
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sasl->params->service;
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char *serverdata;
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#endif
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size_t len = 0;
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*progress = SASL_INPROGRESS;
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if(sasl->state == SASL_FINAL) {
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if(code != sasl->params->finalcode)
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result = CURLE_LOGIN_DENIED;
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*progress = SASL_DONE;
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state(sasl, conn, SASL_STOP);
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return result;
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}
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if(sasl->state != SASL_CANCEL && sasl->state != SASL_OAUTH2_RESP &&
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code != sasl->params->contcode) {
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*progress = SASL_DONE;
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state(sasl, conn, SASL_STOP);
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return CURLE_LOGIN_DENIED;
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}
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switch(sasl->state) {
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case SASL_STOP:
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*progress = SASL_DONE;
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return result;
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case SASL_PLAIN:
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result = Curl_auth_create_plain_message(data, conn->user, conn->passwd,
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&resp,
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&len);
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break;
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case SASL_LOGIN:
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result = Curl_auth_create_login_message(data, conn->user, &resp, &len);
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newstate = SASL_LOGIN_PASSWD;
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break;
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case SASL_LOGIN_PASSWD:
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result = Curl_auth_create_login_message(data, conn->passwd, &resp, &len);
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break;
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case SASL_EXTERNAL:
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result = Curl_auth_create_external_message(data, conn->user, &resp, &len);
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break;
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#ifndef CURL_DISABLE_CRYPTO_AUTH
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case SASL_CRAMMD5:
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sasl->params->getmessage(data->state.buffer, &serverdata);
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result = Curl_auth_decode_cram_md5_message(serverdata, &chlg, &chlglen);
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if(!result)
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result = Curl_auth_create_cram_md5_message(data, chlg, conn->user,
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conn->passwd, &resp, &len);
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free(chlg);
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break;
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case SASL_DIGESTMD5:
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sasl->params->getmessage(data->state.buffer, &serverdata);
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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->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;
|
|
}
|