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-rw-r--r--lib/rsp_tlscommon.c119
-rw-r--r--lib/rsp_tlscommon.h5
-rw-r--r--lib/tls.c78
-rw-r--r--lib/tls.h1
4 files changed, 85 insertions, 118 deletions
diff --git a/lib/rsp_tlscommon.c b/lib/rsp_tlscommon.c
index 75aa891..abc395e 100644
--- a/lib/rsp_tlscommon.c
+++ b/lib/rsp_tlscommon.c
@@ -11,7 +11,6 @@
#endif
#include <sys/types.h>
-#if defined(RADPROT_TLS) || defined(RADPROT_DTLS)
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
@@ -353,7 +352,7 @@ X509 *verifytlscert(SSL *ssl) {
return cert;
}
-static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
+int subjectaltnameaddr(X509 *cert, int family, const struct in6_addr *addr) {
int loc, i, l, n, r = 0;
char *v;
X509_EXTENSION *ex;
@@ -389,7 +388,7 @@ static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
return r;
}
-static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *regex) {
+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;
@@ -442,7 +441,7 @@ static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *reg
return r;
}
-static int cnregexp(X509 *cert, char *exact, regex_t *regex) {
+int cnregexp(X509 *cert, const char *exact, const regex_t *regex) {
int loc, l;
char *v, *s;
X509_NAME *nm;
@@ -545,118 +544,6 @@ int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
return 1;
}
-#if 0
-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;
-
-errexit:
- free(conf->cacertfile);
- free(conf->cacertpath);
- free(conf->certfile);
- free(conf->certkeyfile);
- free(conf->certkeypwd);
- freegconfmstr(conf->policyoids);
- free(conf);
- return 0;
-}
-#endif
-
-int addmatchcertattr(struct clsrvconf *conf) {
- char *v;
- regex_t **r;
-
- 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
-
/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */
diff --git a/lib/rsp_tlscommon.h b/lib/rsp_tlscommon.h
index 6819cd0..0470aa7 100644
--- a/lib/rsp_tlscommon.h
+++ b/lib/rsp_tlscommon.h
@@ -34,9 +34,10 @@ void ssl_init();
struct tls *tlsgettls(char *alt1, char *alt2);
SSL_CTX *tlsgetctx(uint8_t type, struct tls *t);
X509 *verifytlscert(SSL *ssl);
+int subjectaltnameaddr(X509 *cert, int family, const struct in6_addr *addr);
+int subjectaltnameregexp(X509 *cert, int type, const char *exact, const regex_t *regex);
+int cnregexp(X509 *cert, const char *exact, const regex_t *regex);
int verifyconfcert(X509 *cert, struct clsrvconf *conf);
-int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val);
-int addmatchcertattr(struct clsrvconf *conf);
#endif
#if defined (__cplusplus)
diff --git a/lib/tls.c b/lib/tls.c
index 0f07e46..610df98 100644
--- a/lib/tls.c
+++ b/lib/tls.c
@@ -9,6 +9,7 @@
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/bn.h>
+#include <openssl/x509v3.h>
#include <radsec/radsec.h>
#include <radsec/radsec-impl.h>
@@ -155,3 +156,80 @@ rs_tls_init (struct rs_connection *conn)
rs_free (ctx, tlsconf);
return RSE_OK;
}
+
+/* draft-ietf-radext-radsec-11.txt
+
+ * Certificate validation MUST include the verification rules as
+ per [RFC5280].
+
+ * Implementations SHOULD indicate their acceptable Certification
+ Authorities as per section 7.4.4 (server side) and x.y.z
+ ["Trusted CA Indication"] (client side) of [RFC5246] (see
+ Section 3.2)
+
+ * Implementations SHOULD allow to configure a list of acceptable
+ certificates, identified via certificate fingerprint. When a
+ fingerprint configured, the fingerprint is prepended with an
+ ASCII label identifying the hash function followed by a colon.
+ Implementations MUST support SHA-1 as the hash algorithm and
+ use the ASCII label "sha-1" to identify the SHA-1 algorithm.
+ The length of a SHA-1 hash is 20 bytes and the length of the
+ corresponding fingerprint string is 65 characters. An example
+ certificate fingerprint is: sha-
+ 1:E1:2D:53:2B:7C:6B:8A:29:A2:76:C8:64:36:0B:08:4B:7A:F1:9E:9D
+
+ * Peer validation always includes a check on whether the locally
+ configured expected DNS name or IP address of the server that
+ is contacted matches its presented certificate. DNS names and
+ IP addresses can be contained in the Common Name (CN) or
+ subjectAltName entries. For verification, only one of these
+ entries is to be considered. The following precedence
+ applies: for DNS name validation, subjectAltName:DNS has
+ precedence over CN; for IP address validation, subjectAltName:
+ iPAddr has precedence over CN.
+
+ * Implementations SHOULD allow to configure a set of acceptable
+ values for subjectAltName:URI.
+ */
+int
+tls_verify_cert (struct rs_connection *conn)
+{
+ int err = 0;
+ int success = 0;
+ X509 *peer_cert = NULL;
+ struct in6_addr addr;
+ const char *hostname = NULL;
+
+ assert (conn->active_peer->conn == conn);
+ assert (conn->active_peer->hostname != NULL);
+ hostname = conn->active_peer->hostname;
+
+ /* verifytlscert() performs basic verification as described by
+ OpenSSL VERIFY(1), i.e. verification of the certificate chain. */
+ peer_cert = verifytlscert (conn->tls_ssl);
+ if (peer_cert == NULL)
+ {
+ err = rs_err_conn_push (conn, RSE_SSLERR,
+ "basic certificate validation failed");
+ goto out;
+ }
+
+ if (inet_pton(AF_INET, hostname, &addr))
+ success = (subjectaltnameaddr (peer_cert, AF_INET, &addr) == 1);
+ else if (inet_pton(AF_INET6, hostname, &addr))
+ success = (subjectaltnameaddr (peer_cert, AF_INET6, &addr) == 1);
+ else
+ success = (subjectaltnameregexp (peer_cert, GEN_DNS, hostname, NULL) == 1);
+
+ if (!success)
+ success = (cnregexp(peer_cert, hostname, NULL) == 1);
+
+ if (!success)
+ err = rs_err_conn_push (conn, RSE_CERT, "server certificate doesn't "
+ "match configured hostname \"%s\"", hostname);
+
+ out:
+ if (peer_cert != NULL)
+ X509_free (peer_cert);
+ return err;
+}
diff --git a/lib/tls.h b/lib/tls.h
index d457cfd..0dc2ebd 100644
--- a/lib/tls.h
+++ b/lib/tls.h
@@ -6,6 +6,7 @@ extern "C" {
#endif
int rs_tls_init (struct rs_connection *conn);
+int tls_verify_cert (struct rs_connection *conn);
#if defined (__cplusplus)
}
generated by cgit v1.1 at 2024-12-26 08:47:00 +0000