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* Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#if defined(RADPROT_TLS) || defined(RADPROT_DTLS)
#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/types.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 "hash.h"
#include "util.h"
#include "hostport.h"
#include "radsecproxy.h"
static struct hash *tlsconfs = NULL;
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debug(DBG_WARN, "Certificate no longer valid (after notAfter)");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;
}
}
printf("certificate verify returns %d\n", ok);
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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;
SSL_CTX_set_cert_store(ctx, X509_STORE_new());
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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) {
ctx = SSL_CTX_new(SSLv23_method());
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
SSL_CTX_set_info_callback(ctx, ssl_info_callback);
#if OPENSSL_VERSION_NUMBER >= 0x10002000
/* DTLS_method() seems to have been introduced in OpenSSL 1.0.2. */
ctx = SSL_CTX_new(DTLS_method());
#else
ctx = SSL_CTX_new(DTLSv1_method());
SSL_CTX_set_info_callback(ctx, ssl_info_callback);
SSL_CTX_set_read_ahead(ctx, 1);
break;
}
if (!ctx) {
debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
return NULL;
}
if (sslversion < 0x00908100L ||
(sslversion >= 0x10000000L && sslversion < 0x10000020L)) {
debug(DBG_WARN, "%s: %s seems to be of a version with a "
"certain security critical bug (fixed in OpenSSL 0.9.8p and "
"1.0.0b). Disabling OpenSSL session caching for context %p.",
__func__, SSLeay_version(SSLEAY_VERSION), ctx);
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
}
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if (conf->certkeypwd) {
SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
}
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 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 (!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);
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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;
}
static int subjectaltnameaddr(X509 *cert, int family, 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;
}
static int subjectaltnameregexp(X509 *cert, int type, char *exact, 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);
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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;
}
static int cnregexp(X509 *cert, char *exact, 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 > 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);
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;
}
int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val) {
struct tls *conf;
long int expiry = LONG_MIN;
debug(DBG_DBG, "conftls_cb called for %s", block);
conf = malloc(sizeof(struct tls));
if (!conf) {
debug(DBG_ERR, "conftls_cb: malloc failed");
return 0;
}
memset(conf, 0, sizeof(struct tls));
if (!getgenericconfig(cf, block,
"CACertificateFile", CONF_STR, &conf->cacertfile,
"CACertificatePath", CONF_STR, &conf->cacertpath,
"CertificateFile", CONF_STR, &conf->certfile,
"CertificateKeyFile", CONF_STR, &conf->certkeyfile,
"CertificateKeyPassword", CONF_STR, &conf->certkeypwd,
"CacheExpiry", CONF_LINT, &expiry,
"CRLCheck", CONF_BLN, &conf->crlcheck,
"PolicyOID", CONF_MSTR, &conf->policyoids,
NULL
debug(DBG_ERR, "conftls_cb: configuration error in block %s", val);
goto errexit;
}
if (!conf->certfile || !conf->certkeyfile) {
debug(DBG_ERR, "conftls_cb: TLSCertificateFile and TLSCertificateKeyFile must be specified in block %s", val);
goto errexit;
}
if (!conf->cacertfile && !conf->cacertpath) {
debug(DBG_ERR, "conftls_cb: CA Certificate file or path need to be specified in block %s", val);
goto errexit;
}
if (expiry != LONG_MIN) {
if (expiry < 0) {
debug(DBG_ERR, "error in block %s, value of option CacheExpiry is %ld, may not be negative", val, expiry);
goto errexit;
}
conf->cacheexpiry = expiry;
conf->name = stringcopy(val, 0);
if (!conf->name) {
debug(DBG_ERR, "conftls_cb: malloc failed");
goto errexit;
}
if (!tlsconfs)
tlsconfs = hash_create();
if (!hash_insert(tlsconfs, val, strlen(val), conf)) {
debug(DBG_ERR, "conftls_cb: malloc failed");
goto errexit;
}
if (!tlsgetctx(RAD_TLS, conf))
debug(DBG_ERR, "conftls_cb: error creating ctx for TLS block %s", val);
debug(DBG_DBG, "conftls_cb: added TLS block %s", val);
return 1;
free(conf->cacertfile);
free(conf->cacertpath);
free(conf->certfile);
free(conf->certkeyfile);
free(conf->certkeypwd);
freegconfmstr(conf->policyoids);
free(conf);
return 0;
}
int addmatchcertattr(struct clsrvconf *conf) {
char *v;
regex_t **r;
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if (!strncasecmp(conf->matchcertattr, "CN:/", 4)) {
r = &conf->certcnregex;
v = conf->matchcertattr + 4;
} else if (!strncasecmp(conf->matchcertattr, "SubjectAltName:URI:/", 20)) {
r = &conf->certuriregex;
v = conf->matchcertattr + 20;
} else
return 0;
if (!*v)
return 0;
/* regexp, remove optional trailing / if present */
if (v[strlen(v) - 1] == '/')
v[strlen(v) - 1] = '\0';
if (!*v)
return 0;
*r = malloc(sizeof(regex_t));
if (!*r) {
debug(DBG_ERR, "malloc failed");
return 0;
}
if (regcomp(*r, v, REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
free(*r);
*r = NULL;
debug(DBG_ERR, "failed to compile regular expression %s", v);
return 0;
}
return 1;
}
#else
/* Just to makes file non-empty, should rather avoid compiling this file when not needed */
static void tlsdummy() {
}
#endif