| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2013, 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 http://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. |
| * |
| ***************************************************************************/ |
| |
| #include "curl_setup.h" |
| |
| #ifdef HAVE_GSSAPI |
| #ifdef HAVE_OLD_GSSMIT |
| #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name |
| #define NCOMPAT 1 |
| #endif |
| |
| #ifndef CURL_DISABLE_HTTP |
| |
| #include "urldata.h" |
| #include "sendf.h" |
| #include "curl_gssapi.h" |
| #include "rawstr.h" |
| #include "curl_base64.h" |
| #include "http_negotiate.h" |
| #include "curl_memory.h" |
| #include "url.h" |
| |
| #ifdef HAVE_SPNEGO |
| # include <spnegohelp.h> |
| # ifdef USE_SSLEAY |
| # ifdef USE_OPENSSL |
| # include <openssl/objects.h> |
| # else |
| # include <objects.h> |
| # endif |
| # else |
| # error "Can't compile SPNEGO support without OpenSSL." |
| # endif |
| #endif |
| |
| #define _MPRINTF_REPLACE /* use our functions only */ |
| #include <curl/mprintf.h> |
| |
| /* The last #include file should be: */ |
| #include "memdebug.h" |
| |
| static int |
| get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server) |
| { |
| struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg: |
| &conn->data->state.negotiate; |
| OM_uint32 major_status, minor_status; |
| gss_buffer_desc token = GSS_C_EMPTY_BUFFER; |
| char name[2048]; |
| const char* service; |
| |
| /* GSSAPI implementation by Globus (known as GSI) requires the name to be |
| of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead |
| of at-sign). Also GSI servers are often identified as 'host' not 'khttp'. |
| Change following lines if you want to use GSI */ |
| |
| /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */ |
| |
| if(neg_ctx->gss) |
| service = "KHTTP"; |
| else |
| service = "HTTP"; |
| |
| token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name : |
| conn->host.name) + 1; |
| if(token.length + 1 > sizeof(name)) |
| return EMSGSIZE; |
| |
| snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name : |
| conn->host.name); |
| |
| token.value = (void *) name; |
| major_status = gss_import_name(&minor_status, |
| &token, |
| GSS_C_NT_HOSTBASED_SERVICE, |
| server); |
| |
| return GSS_ERROR(major_status) ? -1 : 0; |
| } |
| |
| static void |
| log_gss_error(struct connectdata *conn, OM_uint32 error_status, |
| const char *prefix) |
| { |
| OM_uint32 maj_stat, min_stat; |
| OM_uint32 msg_ctx = 0; |
| gss_buffer_desc status_string; |
| char buf[1024]; |
| size_t len; |
| |
| snprintf(buf, sizeof(buf), "%s", prefix); |
| len = strlen(buf); |
| do { |
| maj_stat = gss_display_status(&min_stat, |
| error_status, |
| GSS_C_MECH_CODE, |
| GSS_C_NO_OID, |
| &msg_ctx, |
| &status_string); |
| if(sizeof(buf) > len + status_string.length + 1) { |
| snprintf(buf + len, sizeof(buf) - len, |
| ": %s", (char*) status_string.value); |
| len += status_string.length; |
| } |
| gss_release_buffer(&min_stat, &status_string); |
| } while(!GSS_ERROR(maj_stat) && msg_ctx != 0); |
| |
| infof(conn->data, "%s\n", buf); |
| } |
| |
| /* returning zero (0) means success, everything else is treated as "failure" |
| with no care exactly what the failure was */ |
| int Curl_input_negotiate(struct connectdata *conn, bool proxy, |
| const char *header) |
| { |
| struct SessionHandle *data = conn->data; |
| struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg: |
| &data->state.negotiate; |
| OM_uint32 major_status, minor_status, discard_st; |
| gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER; |
| gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER; |
| int ret; |
| size_t len; |
| size_t rawlen = 0; |
| bool gss; |
| const char* protocol; |
| CURLcode error; |
| |
| while(*header && ISSPACE(*header)) |
| header++; |
| if(checkprefix("GSS-Negotiate", header)) { |
| protocol = "GSS-Negotiate"; |
| gss = TRUE; |
| } |
| else if(checkprefix("Negotiate", header)) { |
| protocol = "Negotiate"; |
| gss = FALSE; |
| } |
| else |
| return -1; |
| |
| if(neg_ctx->context) { |
| if(neg_ctx->gss != gss) { |
| return -1; |
| } |
| } |
| else { |
| neg_ctx->protocol = protocol; |
| neg_ctx->gss = gss; |
| } |
| |
| if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) { |
| /* 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_cleanup_negotiate(data); |
| return -1; |
| } |
| |
| if(neg_ctx->server_name == NULL && |
| (ret = get_gss_name(conn, proxy, &neg_ctx->server_name))) |
| return ret; |
| |
| header += strlen(neg_ctx->protocol); |
| while(*header && ISSPACE(*header)) |
| header++; |
| |
| len = strlen(header); |
| if(len > 0) { |
| error = Curl_base64_decode(header, |
| (unsigned char **)&input_token.value, &rawlen); |
| if(error || rawlen == 0) |
| return -1; |
| input_token.length = rawlen; |
| |
| DEBUGASSERT(input_token.value != NULL); |
| |
| #ifdef HAVE_SPNEGO /* Handle SPNEGO */ |
| if(checkprefix("Negotiate", header)) { |
| unsigned char *spnegoToken = NULL; |
| size_t spnegoTokenLength = 0; |
| gss_buffer_desc mechToken = GSS_C_EMPTY_BUFFER; |
| |
| spnegoToken = malloc(input_token.length); |
| if(spnegoToken == NULL) { |
| Curl_safefree(input_token.value); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| memcpy(spnegoToken, input_token.value, input_token.length); |
| spnegoTokenLength = input_token.length; |
| |
| if(!parseSpnegoTargetToken(spnegoToken, |
| spnegoTokenLength, |
| NULL, |
| NULL, |
| (unsigned char**)&mechToken.value, |
| &mechToken.length, |
| NULL, |
| NULL)) { |
| Curl_safefree(spnegoToken); |
| infof(data, "Parse SPNEGO Target Token failed\n"); |
| } |
| else if(!mechToken.value || !mechToken.length) { |
| Curl_safefree(spnegoToken); |
| if(mechToken.value) |
| gss_release_buffer(&discard_st, &mechToken); |
| infof(data, "Parse SPNEGO Target Token succeeded (NULL token)\n"); |
| } |
| else { |
| Curl_safefree(spnegoToken); |
| Curl_safefree(input_token.value); |
| input_token.value = malloc(mechToken.length); |
| if(input_token.value == NULL) { |
| gss_release_buffer(&discard_st, &mechToken); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| memcpy(input_token.value, mechToken.value, mechToken.length); |
| input_token.length = mechToken.length; |
| gss_release_buffer(&discard_st, &mechToken); |
| infof(data, "Parse SPNEGO Target Token succeeded\n"); |
| } |
| } |
| #endif |
| } |
| |
| major_status = Curl_gss_init_sec_context(data, |
| &minor_status, |
| &neg_ctx->context, |
| neg_ctx->server_name, |
| GSS_C_NO_CHANNEL_BINDINGS, |
| &input_token, |
| &output_token, |
| NULL); |
| Curl_safefree(input_token.value); |
| |
| neg_ctx->status = major_status; |
| if(GSS_ERROR(major_status)) { |
| if(output_token.value) |
| gss_release_buffer(&discard_st, &output_token); |
| log_gss_error(conn, minor_status, "gss_init_sec_context() failed: "); |
| return -1; |
| } |
| |
| if(!output_token.value || !output_token.length) { |
| if(output_token.value) |
| gss_release_buffer(&discard_st, &output_token); |
| return -1; |
| } |
| |
| neg_ctx->output_token = output_token; |
| return 0; |
| } |
| |
| |
| CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy) |
| { |
| struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg: |
| &conn->data->state.negotiate; |
| char *encoded = NULL; |
| size_t len = 0; |
| char *userp; |
| CURLcode error; |
| OM_uint32 discard_st; |
| |
| #ifdef HAVE_SPNEGO /* Handle SPNEGO */ |
| if(checkprefix("Negotiate", neg_ctx->protocol)) { |
| ASN1_OBJECT *object = NULL; |
| unsigned char *responseToken = NULL; |
| size_t responseTokenLength = 0; |
| gss_buffer_desc spnegoToken = GSS_C_EMPTY_BUFFER; |
| |
| responseToken = malloc(neg_ctx->output_token.length); |
| if(responseToken == NULL) |
| return CURLE_OUT_OF_MEMORY; |
| memcpy(responseToken, neg_ctx->output_token.value, |
| neg_ctx->output_token.length); |
| responseTokenLength = neg_ctx->output_token.length; |
| |
| object = OBJ_txt2obj("1.2.840.113554.1.2.2", 1); |
| if(!object) { |
| Curl_safefree(responseToken); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| |
| if(!makeSpnegoInitialToken(object, |
| responseToken, |
| responseTokenLength, |
| (unsigned char**)&spnegoToken.value, |
| &spnegoToken.length)) { |
| Curl_safefree(responseToken); |
| ASN1_OBJECT_free(object); |
| infof(conn->data, "Make SPNEGO Initial Token failed\n"); |
| } |
| else if(!spnegoToken.value || !spnegoToken.length) { |
| Curl_safefree(responseToken); |
| ASN1_OBJECT_free(object); |
| if(spnegoToken.value) |
| gss_release_buffer(&discard_st, &spnegoToken); |
| infof(conn->data, "Make SPNEGO Initial Token succeeded (NULL token)\n"); |
| } |
| else { |
| Curl_safefree(responseToken); |
| ASN1_OBJECT_free(object); |
| gss_release_buffer(&discard_st, &neg_ctx->output_token); |
| neg_ctx->output_token.value = spnegoToken.value; |
| neg_ctx->output_token.length = spnegoToken.length; |
| infof(conn->data, "Make SPNEGO Initial Token succeeded\n"); |
| } |
| } |
| #endif |
| error = Curl_base64_encode(conn->data, |
| neg_ctx->output_token.value, |
| neg_ctx->output_token.length, |
| &encoded, &len); |
| if(error) { |
| gss_release_buffer(&discard_st, &neg_ctx->output_token); |
| neg_ctx->output_token.value = NULL; |
| neg_ctx->output_token.length = 0; |
| return error; |
| } |
| |
| if(!encoded || !len) { |
| gss_release_buffer(&discard_st, &neg_ctx->output_token); |
| neg_ctx->output_token.value = NULL; |
| neg_ctx->output_token.length = 0; |
| return CURLE_REMOTE_ACCESS_DENIED; |
| } |
| |
| userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "", |
| neg_ctx->protocol, encoded); |
| if(proxy) { |
| Curl_safefree(conn->allocptr.proxyuserpwd); |
| conn->allocptr.proxyuserpwd = userp; |
| } |
| else { |
| Curl_safefree(conn->allocptr.userpwd); |
| conn->allocptr.userpwd = userp; |
| } |
| |
| Curl_safefree(encoded); |
| Curl_cleanup_negotiate(conn->data); |
| |
| return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK; |
| } |
| |
| static void cleanup(struct negotiatedata *neg_ctx) |
| { |
| OM_uint32 minor_status; |
| if(neg_ctx->context != GSS_C_NO_CONTEXT) |
| gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER); |
| |
| if(neg_ctx->output_token.value) |
| gss_release_buffer(&minor_status, &neg_ctx->output_token); |
| |
| if(neg_ctx->server_name != GSS_C_NO_NAME) |
| gss_release_name(&minor_status, &neg_ctx->server_name); |
| |
| memset(neg_ctx, 0, sizeof(*neg_ctx)); |
| } |
| |
| void Curl_cleanup_negotiate(struct SessionHandle *data) |
| { |
| cleanup(&data->state.negotiate); |
| cleanup(&data->state.proxyneg); |
| } |
| |
| |
| #endif |
| #endif |
