/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2014, 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" #if !defined(CURL_DISABLE_LDAP) && !defined(USE_OPENLDAP) /* * Notice that USE_OPENLDAP is only a source code selection switch. When * libcurl is built with USE_OPENLDAP defined the libcurl source code that * gets compiled is the code from openldap.c, otherwise the code that gets * compiled is the code from ldap.c. * * When USE_OPENLDAP is defined a recent version of the OpenLDAP library * might be required for compilation and runtime. In order to use ancient * OpenLDAP library versions, USE_OPENLDAP shall not be defined. */ #ifdef CURL_LDAP_WIN /* Use Windows LDAP implementation. */ # include <winldap.h> # ifndef LDAP_VENDOR_NAME # error Your Platform SDK is NOT sufficient for LDAP support! \ Update your Platform SDK, or disable LDAP support! # else # include <winber.h> # endif #else # define LDAP_DEPRECATED 1 /* Be sure ldap_init() is defined. */ # ifdef HAVE_LBER_H # include <lber.h> # endif # include <ldap.h> # if (defined(HAVE_LDAP_SSL) && defined(HAVE_LDAP_SSL_H)) # include <ldap_ssl.h> # endif /* HAVE_LDAP_SSL && HAVE_LDAP_SSL_H */ #endif #include "urldata.h" #include <curl/curl.h> #include "sendf.h" #include "escape.h" #include "progress.h" #include "transfer.h" #include "strequal.h" #include "strtok.h" #include "curl_ldap.h" #include "curl_memory.h" #include "curl_base64.h" #include "rawstr.h" #define _MPRINTF_REPLACE /* use our functions only */ #include <curl/mprintf.h> #include "memdebug.h" #ifndef HAVE_LDAP_URL_PARSE /* Use our own implementation. */ typedef struct { char *lud_host; int lud_port; char *lud_dn; char **lud_attrs; int lud_scope; char *lud_filter; char **lud_exts; size_t lud_attrs_dups; /* how many were dup'ed, this field is not in the "real" struct so can only be used in code without HAVE_LDAP_URL_PARSE defined */ } CURL_LDAPURLDesc; #undef LDAPURLDesc #define LDAPURLDesc CURL_LDAPURLDesc static int _ldap_url_parse (const struct connectdata *conn, LDAPURLDesc **ludp); static void _ldap_free_urldesc (LDAPURLDesc *ludp); #undef ldap_free_urldesc #define ldap_free_urldesc _ldap_free_urldesc #endif #ifdef DEBUG_LDAP #define LDAP_TRACE(x) do { \ _ldap_trace ("%u: ", __LINE__); \ _ldap_trace x; \ } WHILE_FALSE static void _ldap_trace (const char *fmt, ...); #else #define LDAP_TRACE(x) Curl_nop_stmt #endif static CURLcode Curl_ldap(struct connectdata *conn, bool *done); /* * LDAP protocol handler. */ const struct Curl_handler Curl_handler_ldap = { "LDAP", /* scheme */ ZERO_NULL, /* setup_connection */ Curl_ldap, /* do_it */ ZERO_NULL, /* done */ ZERO_NULL, /* do_more */ ZERO_NULL, /* connect_it */ ZERO_NULL, /* connecting */ ZERO_NULL, /* doing */ ZERO_NULL, /* proto_getsock */ ZERO_NULL, /* doing_getsock */ ZERO_NULL, /* domore_getsock */ ZERO_NULL, /* perform_getsock */ ZERO_NULL, /* disconnect */ ZERO_NULL, /* readwrite */ PORT_LDAP, /* defport */ CURLPROTO_LDAP, /* protocol */ PROTOPT_NONE /* flags */ }; #ifdef HAVE_LDAP_SSL /* * LDAPS protocol handler. */ const struct Curl_handler Curl_handler_ldaps = { "LDAPS", /* scheme */ ZERO_NULL, /* setup_connection */ Curl_ldap, /* do_it */ ZERO_NULL, /* done */ ZERO_NULL, /* do_more */ ZERO_NULL, /* connect_it */ ZERO_NULL, /* connecting */ ZERO_NULL, /* doing */ ZERO_NULL, /* proto_getsock */ ZERO_NULL, /* doing_getsock */ ZERO_NULL, /* domore_getsock */ ZERO_NULL, /* perform_getsock */ ZERO_NULL, /* disconnect */ ZERO_NULL, /* readwrite */ PORT_LDAPS, /* defport */ CURLPROTO_LDAPS, /* protocol */ PROTOPT_SSL /* flags */ }; #endif static CURLcode Curl_ldap(struct connectdata *conn, bool *done) { CURLcode status = CURLE_OK; int rc = 0; LDAP *server = NULL; LDAPURLDesc *ludp = NULL; LDAPMessage *result = NULL; LDAPMessage *entryIterator; int num = 0; struct SessionHandle *data=conn->data; int ldap_proto = LDAP_VERSION3; int ldap_ssl = 0; char *val_b64 = NULL; size_t val_b64_sz = 0; curl_off_t dlsize = 0; #ifdef LDAP_OPT_NETWORK_TIMEOUT struct timeval ldap_timeout = {10,0}; /* 10 sec connection/search timeout */ #endif *done = TRUE; /* unconditionally */ infof(data, "LDAP local: LDAP Vendor = %s ; LDAP Version = %d\n", LDAP_VENDOR_NAME, LDAP_VENDOR_VERSION); infof(data, "LDAP local: %s\n", data->change.url); #ifdef HAVE_LDAP_URL_PARSE rc = ldap_url_parse(data->change.url, &ludp); #else rc = _ldap_url_parse(conn, &ludp); #endif if(rc != 0) { failf(data, "LDAP local: %s", ldap_err2string(rc)); status = CURLE_LDAP_INVALID_URL; goto quit; } /* Get the URL scheme ( either ldap or ldaps ) */ if(conn->given->flags & PROTOPT_SSL) ldap_ssl = 1; infof(data, "LDAP local: trying to establish %s connection\n", ldap_ssl ? "encrypted" : "cleartext"); #ifdef LDAP_OPT_NETWORK_TIMEOUT ldap_set_option(NULL, LDAP_OPT_NETWORK_TIMEOUT, &ldap_timeout); #endif ldap_set_option(NULL, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto); if(ldap_ssl) { #ifdef HAVE_LDAP_SSL #ifdef CURL_LDAP_WIN /* Win32 LDAP SDK doesn't support insecure mode without CA! */ server = ldap_sslinit(conn->host.name, (int)conn->port, 1); ldap_set_option(server, LDAP_OPT_SSL, LDAP_OPT_ON); #else int ldap_option; char* ldap_ca = data->set.str[STRING_SSL_CAFILE]; #if defined(CURL_HAS_NOVELL_LDAPSDK) rc = ldapssl_client_init(NULL, NULL); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ldapssl_client_init %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } if(data->set.ssl.verifypeer) { /* Novell SDK supports DER or BASE64 files. */ int cert_type = LDAPSSL_CERT_FILETYPE_B64; if((data->set.str[STRING_CERT_TYPE]) && (Curl_raw_equal(data->set.str[STRING_CERT_TYPE], "DER"))) cert_type = LDAPSSL_CERT_FILETYPE_DER; if(!ldap_ca) { failf(data, "LDAP local: ERROR %s CA cert not set!", (cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM")); status = CURLE_SSL_CERTPROBLEM; goto quit; } infof(data, "LDAP local: using %s CA cert '%s'\n", (cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM"), ldap_ca); rc = ldapssl_add_trusted_cert(ldap_ca, cert_type); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR setting %s CA cert: %s", (cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM"), ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } ldap_option = LDAPSSL_VERIFY_SERVER; } else ldap_option = LDAPSSL_VERIFY_NONE; rc = ldapssl_set_verify_mode(ldap_option); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR setting cert verify mode: %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } server = ldapssl_init(conn->host.name, (int)conn->port, 1); if(server == NULL) { failf(data, "LDAP local: Cannot connect to %s:%ld", conn->host.name, conn->port); status = CURLE_COULDNT_CONNECT; goto quit; } #elif defined(LDAP_OPT_X_TLS) if(data->set.ssl.verifypeer) { /* OpenLDAP SDK supports BASE64 files. */ if((data->set.str[STRING_CERT_TYPE]) && (!Curl_raw_equal(data->set.str[STRING_CERT_TYPE], "PEM"))) { failf(data, "LDAP local: ERROR OpenLDAP only supports PEM cert-type!"); status = CURLE_SSL_CERTPROBLEM; goto quit; } if(!ldap_ca) { failf(data, "LDAP local: ERROR PEM CA cert not set!"); status = CURLE_SSL_CERTPROBLEM; goto quit; } infof(data, "LDAP local: using PEM CA cert: %s\n", ldap_ca); rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE, ldap_ca); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR setting PEM CA cert: %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } ldap_option = LDAP_OPT_X_TLS_DEMAND; } else ldap_option = LDAP_OPT_X_TLS_NEVER; rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &ldap_option); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR setting cert verify mode: %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } server = ldap_init(conn->host.name, (int)conn->port); if(server == NULL) { failf(data, "LDAP local: Cannot connect to %s:%ld", conn->host.name, conn->port); status = CURLE_COULDNT_CONNECT; goto quit; } ldap_option = LDAP_OPT_X_TLS_HARD; rc = ldap_set_option(server, LDAP_OPT_X_TLS, &ldap_option); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR setting SSL/TLS mode: %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } /* rc = ldap_start_tls_s(server, NULL, NULL); if(rc != LDAP_SUCCESS) { failf(data, "LDAP local: ERROR starting SSL/TLS mode: %s", ldap_err2string(rc)); status = CURLE_SSL_CERTPROBLEM; goto quit; } */ #else /* we should probably never come up to here since configure should check in first place if we can support LDAP SSL/TLS */ failf(data, "LDAP local: SSL/TLS not supported with this version " "of the OpenLDAP toolkit\n"); status = CURLE_SSL_CERTPROBLEM; goto quit; #endif #endif #endif /* CURL_LDAP_USE_SSL */ } else { server = ldap_init(conn->host.name, (int)conn->port); if(server == NULL) { failf(data, "LDAP local: Cannot connect to %s:%ld", conn->host.name, conn->port); status = CURLE_COULDNT_CONNECT; goto quit; } } #ifdef CURL_LDAP_WIN ldap_set_option(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto); #endif rc = ldap_simple_bind_s(server, conn->bits.user_passwd ? conn->user : NULL, conn->bits.user_passwd ? conn->passwd : NULL); if(!ldap_ssl && rc != 0) { ldap_proto = LDAP_VERSION2; ldap_set_option(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto); rc = ldap_simple_bind_s(server, conn->bits.user_passwd ? conn->user : NULL, conn->bits.user_passwd ? conn->passwd : NULL); } if(rc != 0) { failf(data, "LDAP local: ldap_simple_bind_s %s", ldap_err2string(rc)); status = CURLE_LDAP_CANNOT_BIND; goto quit; } rc = ldap_search_s(server, ludp->lud_dn, ludp->lud_scope, ludp->lud_filter, ludp->lud_attrs, 0, &result); if(rc != 0 && rc != LDAP_SIZELIMIT_EXCEEDED) { failf(data, "LDAP remote: %s", ldap_err2string(rc)); status = CURLE_LDAP_SEARCH_FAILED; goto quit; } for(num = 0, entryIterator = ldap_first_entry(server, result); entryIterator; entryIterator = ldap_next_entry(server, entryIterator), num++) { BerElement *ber = NULL; char *attribute; /*! suspicious that this isn't 'const' */ char *dn = ldap_get_dn(server, entryIterator); int i; Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"DN: ", 4); Curl_client_write(conn, CLIENTWRITE_BODY, (char *)dn, 0); Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1); dlsize += strlen(dn)+5; for(attribute = ldap_first_attribute(server, entryIterator, &ber); attribute; attribute = ldap_next_attribute(server, entryIterator, ber)) { BerValue **vals = ldap_get_values_len(server, entryIterator, attribute); if(vals != NULL) { for(i = 0; (vals[i] != NULL); i++) { Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\t", 1); Curl_client_write(conn, CLIENTWRITE_BODY, (char *) attribute, 0); Curl_client_write(conn, CLIENTWRITE_BODY, (char *)": ", 2); dlsize += strlen(attribute)+3; if((strlen(attribute) > 7) && (strcmp(";binary", (char *)attribute + (strlen((char *)attribute) - 7)) == 0)) { /* Binary attribute, encode to base64. */ CURLcode error = Curl_base64_encode(data, vals[i]->bv_val, vals[i]->bv_len, &val_b64, &val_b64_sz); if(error) { ldap_value_free_len(vals); ldap_memfree(attribute); ldap_memfree(dn); if(ber) ber_free(ber, 0); status = error; goto quit; } if(val_b64_sz > 0) { Curl_client_write(conn, CLIENTWRITE_BODY, val_b64, val_b64_sz); free(val_b64); dlsize += val_b64_sz; } } else { Curl_client_write(conn, CLIENTWRITE_BODY, vals[i]->bv_val, vals[i]->bv_len); dlsize += vals[i]->bv_len; } Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 0); dlsize++; } /* Free memory used to store values */ ldap_value_free_len(vals); } Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1); dlsize++; Curl_pgrsSetDownloadCounter(data, dlsize); ldap_memfree(attribute); } ldap_memfree(dn); if(ber) ber_free(ber, 0); } quit: if(result) { ldap_msgfree(result); LDAP_TRACE (("Received %d entries\n", num)); } if(rc == LDAP_SIZELIMIT_EXCEEDED) infof(data, "There are more than %d entries\n", num); if(ludp) ldap_free_urldesc(ludp); if(server) ldap_unbind_s(server); #if defined(HAVE_LDAP_SSL) && defined(CURL_HAS_NOVELL_LDAPSDK) if(ldap_ssl) ldapssl_client_deinit(); #endif /* HAVE_LDAP_SSL && CURL_HAS_NOVELL_LDAPSDK */ /* no data to transfer */ Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); conn->bits.close = TRUE; return status; } #ifdef DEBUG_LDAP static void _ldap_trace (const char *fmt, ...) { static int do_trace = -1; va_list args; if(do_trace == -1) { const char *env = getenv("CURL_TRACE"); do_trace = (env && strtol(env, NULL, 10) > 0); } if(!do_trace) return; va_start (args, fmt); vfprintf (stderr, fmt, args); va_end (args); } #endif #ifndef HAVE_LDAP_URL_PARSE /* * Return scope-value for a scope-string. */ static int str2scope (const char *p) { if(strequal(p, "one")) return LDAP_SCOPE_ONELEVEL; if(strequal(p, "onetree")) return LDAP_SCOPE_ONELEVEL; if(strequal(p, "base")) return LDAP_SCOPE_BASE; if(strequal(p, "sub")) return LDAP_SCOPE_SUBTREE; if(strequal( p, "subtree")) return LDAP_SCOPE_SUBTREE; return (-1); } /* * Split 'str' into strings separated by commas. * Note: res[] points into 'str'. */ static char **split_str (char *str) { char **res, *lasts, *s; int i; for(i = 2, s = strchr(str,','); s; i++) s = strchr(++s,','); res = calloc(i, sizeof(char*)); if(!res) return NULL; for(i = 0, s = strtok_r(str, ",", &lasts); s; s = strtok_r(NULL, ",", &lasts), i++) res[i] = s; return res; } /* * Unescape the LDAP-URL components */ static bool unescape_elements (void *data, LDAPURLDesc *ludp) { int i; if(ludp->lud_filter) { ludp->lud_filter = curl_easy_unescape(data, ludp->lud_filter, 0, NULL); if(!ludp->lud_filter) return FALSE; } for(i = 0; ludp->lud_attrs && ludp->lud_attrs[i]; i++) { ludp->lud_attrs[i] = curl_easy_unescape(data, ludp->lud_attrs[i], 0, NULL); if(!ludp->lud_attrs[i]) return FALSE; ludp->lud_attrs_dups++; } if(ludp->lud_dn) { char *dn = ludp->lud_dn; char *new_dn = curl_easy_unescape(data, dn, 0, NULL); free(dn); ludp->lud_dn = new_dn; if(!new_dn) return (FALSE); } return (TRUE); } /* * Break apart the pieces of an LDAP URL. * Syntax: * ldap://<hostname>:<port>/<base_dn>?<attributes>?<scope>?<filter>?<ext> * * <hostname> already known from 'conn->host.name'. * <port> already known from 'conn->remote_port'. * extract the rest from 'conn->data->state.path+1'. All fields are optional. * e.g. * ldap://<hostname>:<port>/?<attributes>?<scope>?<filter> * yields ludp->lud_dn = "". * * Defined in RFC4516 section 2. */ static int _ldap_url_parse2 (const struct connectdata *conn, LDAPURLDesc *ludp) { char *p, *q; int i; if(!conn->data || !conn->data->state.path || conn->data->state.path[0] != '/' || !checkprefix("LDAP", conn->data->change.url)) return LDAP_INVALID_SYNTAX; ludp->lud_scope = LDAP_SCOPE_BASE; ludp->lud_port = conn->remote_port; ludp->lud_host = conn->host.name; /* parse DN (Distinguished Name). */ ludp->lud_dn = strdup(conn->data->state.path+1); if(!ludp->lud_dn) return LDAP_NO_MEMORY; p = strchr(ludp->lud_dn, '?'); LDAP_TRACE (("DN '%.*s'\n", p ? (size_t)(p-ludp->lud_dn) : strlen(ludp->lud_dn), ludp->lud_dn)); if(!p) goto success; *p++ = '\0'; /* parse attributes. skip "??". */ q = strchr(p, '?'); if(q) *q++ = '\0'; if(*p && *p != '?') { ludp->lud_attrs = split_str(p); if(!ludp->lud_attrs) return LDAP_NO_MEMORY; for(i = 0; ludp->lud_attrs[i]; i++) LDAP_TRACE (("attr[%d] '%s'\n", i, ludp->lud_attrs[i])); } p = q; if(!p) goto success; /* parse scope. skip "??" */ q = strchr(p, '?'); if(q) *q++ = '\0'; if(*p && *p != '?') { ludp->lud_scope = str2scope(p); if(ludp->lud_scope == -1) { return LDAP_INVALID_SYNTAX; } LDAP_TRACE (("scope %d\n", ludp->lud_scope)); } p = q; if(!p) goto success; /* parse filter */ q = strchr(p, '?'); if(q) *q++ = '\0'; if(!*p) { return LDAP_INVALID_SYNTAX; } ludp->lud_filter = p; LDAP_TRACE (("filter '%s'\n", ludp->lud_filter)); success: if(!unescape_elements(conn->data, ludp)) return LDAP_NO_MEMORY; return LDAP_SUCCESS; } static int _ldap_url_parse (const struct connectdata *conn, LDAPURLDesc **ludpp) { LDAPURLDesc *ludp = calloc(1, sizeof(*ludp)); int rc; *ludpp = NULL; if(!ludp) return LDAP_NO_MEMORY; rc = _ldap_url_parse2 (conn, ludp); if(rc != LDAP_SUCCESS) { _ldap_free_urldesc(ludp); ludp = NULL; } *ludpp = ludp; return (rc); } static void _ldap_free_urldesc (LDAPURLDesc *ludp) { size_t i; if(!ludp) return; if(ludp->lud_dn) free(ludp->lud_dn); if(ludp->lud_filter) free(ludp->lud_filter); if(ludp->lud_attrs) { for(i = 0; i < ludp->lud_attrs_dups; i++) free(ludp->lud_attrs[i]); free(ludp->lud_attrs); } free (ludp); } #endif /* !HAVE_LDAP_URL_PARSE */ #endif /* !CURL_DISABLE_LDAP && !USE_OPENLDAP */