--- /dev/null
+/* Copyright (c) 2007-2009, UNINETT AS
+ * Copyright (c) 2010-2011, NORDUnet A/S */
+/* See LICENSE for licensing information. */
+
+#if defined HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+#ifdef SYS_SOLARIS9
+#include <fcntl.h>
+#endif
+#include <sys/time.h>
+#include <sys/select.h>
+#include <ctype.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <regex.h>
+#include <libgen.h>
+#include <pthread.h>
+#include <openssl/ssl.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#include <openssl/md5.h>
+#include <openssl/x509v3.h>
+#include "debug.h"
+#include "list.h"
+#include "hash.h"
+#include "util.h"
+#include "hostport_types.h"
+#include "radsecproxy.h"
+
+static struct hash *tlsconfs = NULL;
+
+void ssl_init(void) {
+ time_t t;
+ pid_t pid;
+
+ SSL_load_error_strings();
+ SSL_library_init();
+
+ while (!RAND_status()) {
+ t = time(NULL);
+ pid = getpid();
+ RAND_seed((unsigned char *)&t, sizeof(time_t));
+ RAND_seed((unsigned char *)&pid, sizeof(pid));
+ }
+}
+
+static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
+ int pwdlen = strlen(userdata);
+ if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
+ return 0;
+ memcpy(buf, userdata, pwdlen);
+ return pwdlen;
+}
+
+static int verify_cb(int ok, X509_STORE_CTX *ctx) {
+ char *buf = NULL;
+ X509 *err_cert;
+ int err, depth;
+
+ err_cert = X509_STORE_CTX_get_current_cert(ctx);
+ err = X509_STORE_CTX_get_error(ctx);
+ depth = X509_STORE_CTX_get_error_depth(ctx);
+
+ if (depth > MAX_CERT_DEPTH) {
+ ok = 0;
+ err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
+ X509_STORE_CTX_set_error(ctx, err);
+ }
+
+ if (!ok) {
+ if (err_cert)
+ buf = X509_NAME_oneline(X509_get_subject_name(err_cert), NULL, 0);
+ debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf ? buf : "");
+ free(buf);
+ buf = NULL;
+
+ switch (err) {
+ case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
+ if (err_cert) {
+ buf = X509_NAME_oneline(X509_get_issuer_name(err_cert), NULL, 0);
+ if (buf) {
+ debug(DBG_WARN, "\tIssuer=%s", buf);
+ free(buf);
+ buf = NULL;
+ }
+ }
+ break;
+ case X509_V_ERR_CERT_NOT_YET_VALID:
+ case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
+ debug(DBG_WARN, "\tCertificate not yet valid");
+ break;
+ case X509_V_ERR_CERT_HAS_EXPIRED:
+ debug(DBG_WARN, "Certificate has expired");
+ break;
+ case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
+ debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
+ break;
+ case X509_V_ERR_NO_EXPLICIT_POLICY:
+ debug(DBG_WARN, "No Explicit Certificate Policy");
+ break;
+ }
+ }
+ return ok;
+}
+
+#ifdef DEBUG
+static void ssl_info_callback(const SSL *ssl, int where, int ret) {
+ const char *s;
+ int w;
+
+ w = where & ~SSL_ST_MASK;
+
+ if (w & SSL_ST_CONNECT)
+ s = "SSL_connect";
+ else if (w & SSL_ST_ACCEPT)
+ s = "SSL_accept";
+ else
+ s = "undefined";
+
+ if (where & SSL_CB_LOOP)
+ debug(DBG_DBG, "%s:%s\n", s, SSL_state_string_long(ssl));
+ else if (where & SSL_CB_ALERT) {
+ s = (where & SSL_CB_READ) ? "read" : "write";
+ debug(DBG_DBG, "SSL3 alert %s:%s:%s\n", s, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
+ }
+ else if (where & SSL_CB_EXIT) {
+ if (ret == 0)
+ debug(DBG_DBG, "%s:failed in %s\n", s, SSL_state_string_long(ssl));
+ else if (ret < 0)
+ debug(DBG_DBG, "%s:error in %s\n", s, SSL_state_string_long(ssl));
+ }
+}
+#endif
+
+static X509_VERIFY_PARAM *createverifyparams(char **poids) {
+ X509_VERIFY_PARAM *pm;
+ ASN1_OBJECT *pobject;
+ int i;
+
+ pm = X509_VERIFY_PARAM_new();
+ if (!pm)
+ return NULL;
+
+ for (i = 0; poids[i]; i++) {
+ pobject = OBJ_txt2obj(poids[i], 0);
+ if (!pobject) {
+ X509_VERIFY_PARAM_free(pm);
+ return NULL;
+ }
+ X509_VERIFY_PARAM_add0_policy(pm, pobject);
+ }
+
+ X509_VERIFY_PARAM_set_flags(pm, X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY);
+ return pm;
+}
+
+static int tlsaddcacrl(SSL_CTX *ctx, struct tls *conf) {
+ STACK_OF(X509_NAME) *calist;
+ X509_STORE *x509_s;
+ unsigned long error;
+
+ if (!SSL_CTX_load_verify_locations(ctx, conf->cacertfile, conf->cacertpath)) {
+ while ((error = ERR_get_error()))
+ debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
+ debug(DBG_ERR, "tlsaddcacrl: Error updating TLS context %s", conf->name);
+ return 0;
+ }
+
+ calist = conf->cacertfile ? SSL_load_client_CA_file(conf->cacertfile) : NULL;
+
+ if (!conf->cacertfile || calist) {
+ if (conf->cacertpath) {
+ if (!calist)
+ calist = sk_X509_NAME_new_null();
+ if (!SSL_add_dir_cert_subjects_to_stack(calist, conf->cacertpath)) {
+ sk_X509_NAME_free(calist);
+ calist = NULL;
+ }
+ }
+ }
+ if (!calist) {
+ while ((error = ERR_get_error()))
+ debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
+ debug(DBG_ERR, "tlsaddcacrl: Error adding CA subjects in TLS context %s", conf->name);
+ return 0;
+ }
+ ERR_clear_error(); /* add_dir_cert_subj returns errors on success */
+ SSL_CTX_set_client_CA_list(ctx, calist);
+
+ SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
+ SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
+
+ if (conf->crlcheck || conf->vpm) {
+ x509_s = SSL_CTX_get_cert_store(ctx);
+ if (conf->crlcheck)
+ X509_STORE_set_flags(x509_s, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
+ if (conf->vpm)
+ X509_STORE_set1_param(x509_s, conf->vpm);
+ }
+
+ debug(DBG_DBG, "tlsaddcacrl: updated TLS context %s", conf->name);
+ return 1;
+}
+
+static SSL_CTX *tlscreatectx(uint8_t type, struct tls *conf) {
+ SSL_CTX *ctx = NULL;
+ unsigned long error;
+
+ switch (type) {
+#ifdef RADPROT_TLS
+ case RAD_TLS:
+ ctx = SSL_CTX_new(TLSv1_method());
+ break;
+#endif
+#ifdef RADPROT_DTLS
+ case RAD_DTLS:
+ ctx = SSL_CTX_new(DTLSv1_method());
+ SSL_CTX_set_read_ahead(ctx, 1);
+ break;
+#endif
+ }
+ if (!ctx) {
+ debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
+ while ((error = ERR_get_error()))
+ debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
+ return NULL;
+ }
+#ifdef DEBUG
+ SSL_CTX_set_info_callback(ctx, ssl_info_callback);
+#endif
+
+ if (conf->certkeypwd) {
+ SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
+ SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
+ }
+ if (conf->certfile || conf->certkeyfile) {
+ if (!SSL_CTX_use_certificate_chain_file(ctx, conf->certfile) ||
+ !SSL_CTX_use_PrivateKey_file(ctx, conf->certkeyfile, SSL_FILETYPE_PEM) ||
+ !SSL_CTX_check_private_key(ctx)) {
+ while ((error = ERR_get_error()))
+ debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
+ debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS (certfile issues) in TLS context %s", conf->name);
+ SSL_CTX_free(ctx);
+ return NULL;
+ }
+ }
+
+ if (conf->policyoids) {
+ if (!conf->vpm) {
+ conf->vpm = createverifyparams(conf->policyoids);
+ if (!conf->vpm) {
+ debug(DBG_ERR, "tlscreatectx: Failed to add policyOIDs in TLS context %s", conf->name);
+ SSL_CTX_free(ctx);
+ return NULL;
+ }
+ }
+ }
+
+ if (conf->cacertfile != NULL || conf->cacertpath != NULL)
+ if (!tlsaddcacrl(ctx, conf)) {
+ if (conf->vpm) {
+ X509_VERIFY_PARAM_free(conf->vpm);
+ conf->vpm = NULL;
+ }
+ SSL_CTX_free(ctx);
+ return NULL;
+ }
+
+ debug(DBG_DBG, "tlscreatectx: created TLS context %s", conf->name);
+ return ctx;
+}
+
+struct tls *tlsgettls(char *alt1, char *alt2) {
+ struct tls *t;
+
+ t = hash_read(tlsconfs, alt1, strlen(alt1));
+ if (!t)
+ t = hash_read(tlsconfs, alt2, strlen(alt2));
+ return t;
+}
+
+SSL_CTX *tlsgetctx(uint8_t type, struct tls *t) {
+ struct timeval now;
+
+ if (!t)
+ return NULL;
+ gettimeofday(&now, NULL);
+
+ switch (type) {
+#ifdef RADPROT_TLS
+ case RAD_TLS:
+ if (t->tlsexpiry && t->tlsctx) {
+ if (t->tlsexpiry < now.tv_sec) {
+ t->tlsexpiry = now.tv_sec + t->cacheexpiry;
+ tlsaddcacrl(t->tlsctx, t);
+ }
+ }
+ if (!t->tlsctx) {
+ t->tlsctx = tlscreatectx(RAD_TLS, t);
+ if (t->cacheexpiry)
+ t->tlsexpiry = now.tv_sec + t->cacheexpiry;
+ }
+ return t->tlsctx;
+#endif
+#ifdef RADPROT_DTLS
+ case RAD_DTLS:
+ if (t->dtlsexpiry && t->dtlsctx) {
+ if (t->dtlsexpiry < now.tv_sec) {
+ t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
+ tlsaddcacrl(t->dtlsctx, t);
+ }
+ }
+ if (!t->dtlsctx) {
+ t->dtlsctx = tlscreatectx(RAD_DTLS, t);
+ if (t->cacheexpiry)
+ t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
+ }
+ return t->dtlsctx;
+#endif
+ }
+ return NULL;
+}
+
+X509 *verifytlscert(SSL *ssl) {
+ X509 *cert;
+ unsigned long error;
+
+ if (SSL_get_verify_result(ssl) != X509_V_OK) {
+ debug(DBG_ERR, "verifytlscert: basic validation failed");
+ while ((error = ERR_get_error()))
+ debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
+ return NULL;
+ }
+
+ cert = SSL_get_peer_certificate(ssl);
+ if (!cert)
+ debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
+ return cert;
+}
+
+int subjectaltnameaddr(X509 *cert, int family, const struct in6_addr *addr) {
+ int loc, i, l, n, r = 0;
+ char *v;
+ X509_EXTENSION *ex;
+ STACK_OF(GENERAL_NAME) *alt;
+ GENERAL_NAME *gn;
+
+ debug(DBG_DBG, "subjectaltnameaddr");
+
+ loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
+ if (loc < 0)
+ return r;
+
+ ex = X509_get_ext(cert, loc);
+ alt = X509V3_EXT_d2i(ex);
+ if (!alt)
+ return r;
+
+ n = sk_GENERAL_NAME_num(alt);
+ for (i = 0; i < n; i++) {
+ gn = sk_GENERAL_NAME_value(alt, i);
+ if (gn->type != GEN_IPADD)
+ continue;
+ r = -1;
+ v = (char *)ASN1_STRING_data(gn->d.ia5);
+ l = ASN1_STRING_length(gn->d.ia5);
+ if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
+ && !memcmp(v, &addr, l)) {
+ r = 1;
+ break;
+ }
+ }
+ GENERAL_NAMES_free(alt);
+ return r;
+}
+
+int subjectaltnameregexp(X509 *cert, int type, const char *exact, const regex_t *regex) {
+ int loc, i, l, n, r = 0;
+ char *s, *v;
+ X509_EXTENSION *ex;
+ STACK_OF(GENERAL_NAME) *alt;
+ GENERAL_NAME *gn;
+
+ debug(DBG_DBG, "subjectaltnameregexp");
+
+ loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
+ if (loc < 0)
+ return r;
+
+ ex = X509_get_ext(cert, loc);
+ alt = X509V3_EXT_d2i(ex);
+ if (!alt)
+ return r;
+
+ n = sk_GENERAL_NAME_num(alt);
+ for (i = 0; i < n; i++) {
+ gn = sk_GENERAL_NAME_value(alt, i);
+ if (gn->type != type)
+ continue;
+ r = -1;
+ v = (char *)ASN1_STRING_data(gn->d.ia5);
+ l = ASN1_STRING_length(gn->d.ia5);
+ if (l <= 0)
+ continue;
+#ifdef DEBUG
+ printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
+#endif
+ if (exact) {
+ if (memcmp(v, exact, l))
+ continue;
+ } else {
+ s = stringcopy((char *)v, l);
+ if (!s) {
+ debug(DBG_ERR, "malloc failed");
+ continue;
+ }
+ if (regexec(regex, s, 0, NULL, 0)) {
+ free(s);
+ continue;
+ }
+ free(s);
+ }
+ r = 1;
+ break;
+ }
+ GENERAL_NAMES_free(alt);
+ return r;
+}
+
+int cnregexp(X509 *cert, const char *exact, const regex_t *regex) {
+ int loc, l;
+ char *v, *s;
+ X509_NAME *nm;
+ X509_NAME_ENTRY *e;
+ ASN1_STRING *t;
+
+ nm = X509_get_subject_name(cert);
+ loc = -1;
+ for (;;) {
+ loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
+ if (loc == -1)
+ break;
+ e = X509_NAME_get_entry(nm, loc);
+ t = X509_NAME_ENTRY_get_data(e);
+ v = (char *) ASN1_STRING_data(t);
+ l = ASN1_STRING_length(t);
+ if (l < 0)
+ continue;
+ if (exact) {
+ if (l == strlen(exact) && !strncasecmp(exact, v, l))
+ return 1;
+ } else {
+ s = stringcopy((char *)v, l);
+ if (!s) {
+ debug(DBG_ERR, "malloc failed");
+ continue;
+ }
+ if (regexec(regex, s, 0, NULL, 0)) {
+ free(s);
+ continue;
+ }
+ free(s);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* this is a bit sloppy, should not always accept match to any */
+int certnamecheck(X509 *cert, struct list *hostports) {
+ struct list_node *entry;
+ struct hostportres *hp;
+ int r;
+ uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
+ struct in6_addr addr;
+
+ for (entry = list_first(hostports); entry; entry = list_next(entry)) {
+ hp = (struct hostportres *)entry->data;
+ if (hp->prefixlen != 255) {
+ /* we disable the check for prefixes */
+ return 1;
+ }
+ if (inet_pton(AF_INET, hp->host, &addr))
+ type = AF_INET;
+ else if (inet_pton(AF_INET6, hp->host, &addr))
+ type = AF_INET6;
+ else
+ type = 0;
+
+ r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, hp->host, NULL);
+ if (r) {
+ if (r > 0) {
+ debug(DBG_DBG, "certnamecheck: Found subjectaltname matching %s %s", type ? "address" : "host", hp->host);
+ return 1;
+ }
+ debug(DBG_WARN, "certnamecheck: No subjectaltname matching %s %s", type ? "address" : "host", hp->host);
+ } else {
+ if (cnregexp(cert, hp->host, NULL)) {
+ debug(DBG_DBG, "certnamecheck: Found cn matching host %s", hp->host);
+ return 1;
+ }
+ debug(DBG_WARN, "certnamecheck: cn not matching host %s", hp->host);
+ }
+ }
+ return 0;
+}
+
+int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
+ if (conf->certnamecheck) {
+ if (!certnamecheck(cert, conf->hostports)) {
+ debug(DBG_WARN, "verifyconfcert: certificate name check failed");
+ return 0;
+ }
+ debug(DBG_WARN, "verifyconfcert: certificate name check ok");
+ }
+ if (conf->certcnregex) {
+ if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
+ debug(DBG_WARN, "verifyconfcert: CN not matching regex");
+ return 0;
+ }
+ debug(DBG_DBG, "verifyconfcert: CN matching regex");
+ }
+ if (conf->certuriregex) {
+ if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
+ debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
+ return 0;
+ }
+ debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
+ }
+ return 1;
+}
+
+/* Local Variables: */
+/* c-file-style: "stroustrup" */
+/* End: */
projects / radsecproxy.git / blobdiff