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-rw-r--r--contrib/slapd-modules/acl/gssacl.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/contrib/slapd-modules/acl/gssacl.c b/contrib/slapd-modules/acl/gssacl.c
new file mode 100644
index 0000000..2fba789
--- /dev/null
+++ b/contrib/slapd-modules/acl/gssacl.c
@@ -0,0 +1,316 @@
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2011 PADL Software Pty Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include <portable.h>
+
+#include <ac/string.h>
+#include <slap.h>
+#include <lutil.h>
+
+#include <sasl/sasl.h>
+#include <gssapi/gssapi.h>
+#include <gssapi/gssapi_ext.h>
+
+#define ACL_BUF_SIZE 1024
+
+typedef struct gssattr_t {
+ slap_style_t gssattr_style;
+ struct berval gssattr_name; /* asserted name */
+ struct berval gssattr_value; /* asserted value */
+} gssattr_t;
+
+static int gssattr_dynacl_destroy( void *priv );
+
+static int
+regex_matches(
+ struct berval *pat, /* pattern to expand and match against */
+ char *str, /* string to match against pattern */
+ struct berval *dn_matches, /* buffer with $N expansion variables from DN */
+ struct berval *val_matches, /* buffer with $N expansion variables from val */
+ AclRegexMatches *matches /* offsets in buffer for $N expansion variables */
+);
+
+static int
+gssattr_dynacl_parse(
+ const char *fname,
+ int lineno,
+ const char *opts,
+ slap_style_t style,
+ const char *pattern,
+ void **privp )
+{
+ gssattr_t *gssattr;
+
+ gssattr = (gssattr_t *)ch_calloc( 1, sizeof( gssattr_t ) );
+
+ if ( opts == NULL || opts[0] == '\0' ) {
+ fprintf( stderr, "%s line %d: GSS ACL: no attribute specified.\n",
+ fname, lineno );
+ goto cleanup;
+ }
+
+ if ( pattern == NULL || pattern[0] == '\0' ) {
+ fprintf( stderr, "%s line %d: GSS ACL: no attribute value specified.\n",
+ fname, lineno );
+ goto cleanup;
+ }
+
+ gssattr->gssattr_style = style;
+
+ switch ( gssattr->gssattr_style ) {
+ case ACL_STYLE_BASE:
+ case ACL_STYLE_REGEX:
+ case ACL_STYLE_EXPAND:
+ break;
+ default:
+ fprintf( stderr, "%s line %d: GSS ACL: unsupported style \"%s\".\n",
+ fname, lineno, style_strings[style] );
+ goto cleanup;
+ break;
+ }
+
+ ber_str2bv( opts, 0, 1, &gssattr->gssattr_name );
+ ber_str2bv( pattern, 0, 1, &gssattr->gssattr_value );
+
+ *privp = (void *)gssattr;
+ return 0;
+
+cleanup:
+ (void)gssattr_dynacl_destroy( (void *)gssattr );
+
+ return 1;
+}
+
+static int
+gssattr_dynacl_unparse(
+ void *priv,
+ struct berval *bv )
+{
+ gssattr_t *gssattr = (gssattr_t *)priv;
+ char *ptr;
+
+ bv->bv_len = STRLENOF( " dynacl/gss/.expand=" ) +
+ gssattr->gssattr_name.bv_len +
+ gssattr->gssattr_value.bv_len;
+ bv->bv_val = ch_malloc( bv->bv_len + 1 );
+
+ ptr = lutil_strcopy( bv->bv_val, " dynacl/gss/" );
+ ptr = lutil_strncopy( ptr, gssattr->gssattr_name.bv_val,
+ gssattr->gssattr_name.bv_len );
+ switch ( gssattr->gssattr_style ) {
+ case ACL_STYLE_BASE:
+ ptr = lutil_strcopy( ptr, ".exact=" );
+ break;
+ case ACL_STYLE_REGEX:
+ ptr = lutil_strcopy( ptr, ".regex=" );
+ break;
+ case ACL_STYLE_EXPAND:
+ ptr = lutil_strcopy( ptr, ".expand=" );
+ break;
+ default:
+ assert( 0 );
+ break;
+ }
+
+ ptr = lutil_strncopy( ptr, gssattr->gssattr_value.bv_val,
+ gssattr->gssattr_value.bv_len );
+
+ ptr[ 0 ] = '\0';
+
+ bv->bv_len = ptr - bv->bv_val;
+
+ return 0;
+}
+
+static int
+gssattr_dynacl_mask(
+ void *priv,
+ Operation *op,
+ Entry *target,
+ AttributeDescription *desc,
+ struct berval *val,
+ int nmatch,
+ regmatch_t *matches,
+ slap_access_t *grant,
+ slap_access_t *deny )
+{
+ gssattr_t *gssattr = (gssattr_t *)priv;
+ sasl_conn_t *sasl_ctx = op->o_conn->c_sasl_authctx;
+ gss_name_t gss_name = GSS_C_NO_NAME;
+ OM_uint32 major, minor;
+ int more = -1;
+ int authenticated, complete;
+ gss_buffer_desc attr = GSS_C_EMPTY_BUFFER;
+ int granted = 0;
+
+ ACL_INVALIDATE( *deny );
+
+ if ( sasl_ctx == NULL ||
+ sasl_getprop( sasl_ctx, SASL_GSS_PEER_NAME, (const void **)&gss_name) != 0 ||
+ gss_name == GSS_C_NO_NAME ) {
+ return 0;
+ }
+
+ attr.length = gssattr->gssattr_name.bv_len;
+ attr.value = gssattr->gssattr_name.bv_val;
+
+ while ( more != 0 ) {
+ AclRegexMatches amatches = { 0 };
+ gss_buffer_desc gss_value = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc gss_display_value = GSS_C_EMPTY_BUFFER;
+ struct berval bv_value;
+
+ major = gss_get_name_attribute( &minor, gss_name, &attr,
+ &authenticated, &complete,
+ &gss_value, &gss_display_value, &more );
+ if ( GSS_ERROR( major ) ) {
+ break;
+ } else if ( authenticated == 0 ) {
+ gss_release_buffer( &minor, &gss_value );
+ gss_release_buffer( &minor, &gss_display_value );
+ continue;
+ }
+
+ bv_value.bv_len = gss_value.length;
+ bv_value.bv_val = (char *)gss_value.value;
+
+ if ( !ber_bvccmp( &gssattr->gssattr_value, '*' ) ) {
+ if ( gssattr->gssattr_style != ACL_STYLE_BASE ) {
+ amatches.dn_count = nmatch;
+ AC_MEMCPY( amatches.dn_data, matches, sizeof( amatches.dn_data ) );
+ }
+
+ switch ( gssattr->gssattr_style ) {
+ case ACL_STYLE_REGEX:
+ /* XXX assumes value NUL terminated */
+ granted = regex_matches( &gssattr->gssattr_value, bv_value.bv_val,
+ &target->e_nname, val, &amatches );
+ break;
+ case ACL_STYLE_EXPAND: {
+ struct berval bv;
+ char buf[ACL_BUF_SIZE];
+
+ bv.bv_len = sizeof( buf ) - 1;
+ bv.bv_val = buf;
+
+ granted = ( acl_string_expand( &bv, &gssattr->gssattr_value,
+ &target->e_nname, val,
+ &amatches ) == 0 ) &&
+ ( ber_bvstrcmp( &bv, &bv_value) == 0 );
+ break;
+ }
+ case ACL_STYLE_BASE:
+ granted = ( ber_bvstrcmp( &gssattr->gssattr_value, &bv_value ) == 0 );
+ break;
+ default:
+ assert(0);
+ break;
+ }
+ } else {
+ granted = 1;
+ }
+
+ gss_release_buffer( &minor, &gss_value );
+ gss_release_buffer( &minor, &gss_display_value );
+
+ if ( granted ) {
+ break;
+ }
+ }
+
+ if ( granted ) {
+ ACL_LVL_ASSIGN_WRITE( *grant );
+ }
+
+ return 0;
+}
+
+static int
+gssattr_dynacl_destroy(
+ void *priv )
+{
+ gssattr_t *gssattr = (gssattr_t *)priv;
+
+ if ( gssattr != NULL ) {
+ if ( !BER_BVISNULL( &gssattr->gssattr_name ) ) {
+ ber_memfree( gssattr->gssattr_name.bv_val );
+ }
+ if ( !BER_BVISNULL( &gssattr->gssattr_value ) ) {
+ ber_memfree( gssattr->gssattr_value.bv_val );
+ }
+ ch_free( gssattr );
+ }
+
+ return 0;
+}
+
+static struct slap_dynacl_t gssattr_dynacl = {
+ "gss",
+ gssattr_dynacl_parse,
+ gssattr_dynacl_unparse,
+ gssattr_dynacl_mask,
+ gssattr_dynacl_destroy
+};
+
+int
+init_module( int argc, char *argv[] )
+{
+ return slap_dynacl_register( &gssattr_dynacl );
+}
+
+
+static int
+regex_matches(
+ struct berval *pat, /* pattern to expand and match against */
+ char *str, /* string to match against pattern */
+ struct berval *dn_matches, /* buffer with $N expansion variables from DN */
+ struct berval *val_matches, /* buffer with $N expansion variables from val */
+ AclRegexMatches *matches /* offsets in buffer for $N expansion variables */
+)
+{
+ regex_t re;
+ char newbuf[ACL_BUF_SIZE];
+ struct berval bv;
+ int rc;
+
+ bv.bv_len = sizeof( newbuf ) - 1;
+ bv.bv_val = newbuf;
+
+ if (str == NULL) {
+ str = "";
+ };
+
+ acl_string_expand( &bv, pat, dn_matches, val_matches, matches );
+ rc = regcomp( &re, newbuf, REG_EXTENDED|REG_ICASE );
+ if ( rc ) {
+ char error[ACL_BUF_SIZE];
+ regerror( rc, &re, error, sizeof( error ) );
+
+ Debug( LDAP_DEBUG_TRACE,
+ "compile( \"%s\", \"%s\") failed %s\n",
+ pat->bv_val, str, error );
+ return( 0 );
+ }
+
+ rc = regexec( &re, str, 0, NULL, 0 );
+ regfree( &re );
+
+ Debug( LDAP_DEBUG_TRACE,
+ "=> regex_matches: string: %s\n", str, 0, 0 );
+ Debug( LDAP_DEBUG_TRACE,
+ "=> regex_matches: rc: %d %s\n",
+ rc, !rc ? "matches" : "no matches", 0 );
+ return( !rc );
+}
+
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