- Flatten the vendor heimdal tree.

1 files changed, 216 insertions, 0 deletions

diff --git a/lib/kadm5/acl.c b/lib/kadm5/acl.c
new file mode 100644
index 0000000..9a2f75b
--- /dev/null
+++ b/lib/kadm5/acl.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "kadm5_locl.h"
+
+RCSID("$Id: acl.c 17445 2006-05-05 10:37:46Z lha $");
+
+static struct units acl_units[] = {
+    { "all",		KADM5_PRIV_ALL },
+    { "change-password",KADM5_PRIV_CPW },
+    { "cpw",		KADM5_PRIV_CPW },
+    { "list",		KADM5_PRIV_LIST },
+    { "delete",		KADM5_PRIV_DELETE },
+    { "modify",		KADM5_PRIV_MODIFY },
+    { "add",		KADM5_PRIV_ADD },
+    { "get", 		KADM5_PRIV_GET },
+    { NULL }
+};
+
+kadm5_ret_t
+_kadm5_string_to_privs(const char *s, uint32_t* privs)
+{
+    int flags;
+    flags = parse_flags(s, acl_units, 0);
+    if(flags < 0)
+	return KADM5_FAILURE;
+    *privs = flags;
+    return 0;
+}
+
+kadm5_ret_t
+_kadm5_privs_to_string(uint32_t privs, char *string, size_t len)
+{
+    if(privs == 0)
+	strlcpy(string, "none", len);
+    else
+	unparse_flags(privs, acl_units + 1, string, len);
+    return 0;
+}
+
+/*
+ * retrieve the right for the current caller on `princ' (NULL means all)
+ * and store them in `ret_flags'
+ * return 0 or an error.
+ */
+
+static kadm5_ret_t
+fetch_acl (kadm5_server_context *context,
+	   krb5_const_principal princ,
+	   unsigned *ret_flags)
+{
+    FILE *f;
+    krb5_error_code ret = 0;
+    char buf[256];
+
+    *ret_flags = 0;
+
+    /* no acl file -> no rights */
+    f = fopen(context->config.acl_file, "r");
+    if (f == NULL)
+	return 0;
+
+    while(fgets(buf, sizeof(buf), f) != NULL) {
+	char *foo = NULL, *p;
+	krb5_principal this_princ;
+	unsigned flags = 0;
+
+	p = strtok_r(buf, " \t\n", &foo);
+	if(p == NULL)
+	    continue;
+	if (*p == '#')		/* comment */
+	    continue;
+	ret = krb5_parse_name(context->context, p, &this_princ);
+	if(ret)
+	    break;
+	if(!krb5_principal_compare(context->context, 
+				   context->caller, this_princ)) {
+	    krb5_free_principal(context->context, this_princ);
+	    continue;
+	}
+	krb5_free_principal(context->context, this_princ);
+	p = strtok_r(NULL, " \t\n", &foo);
+	if(p == NULL)
+	    continue;
+	ret = _kadm5_string_to_privs(p, &flags);
+	if (ret)
+	    break;
+	p = strtok_r(NULL, " \t\n", &foo);
+	if (p == NULL) {
+	    *ret_flags = flags;
+	    break;
+	}
+	if (princ != NULL) {
+	    krb5_principal pattern_princ;
+	    krb5_boolean match;
+
+	    ret = krb5_parse_name (context->context, p, &pattern_princ);
+	    if (ret)
+		break;
+	    match = krb5_principal_match (context->context,
+					  princ, pattern_princ);
+	    krb5_free_principal (context->context, pattern_princ);
+	    if (match) {
+		*ret_flags = flags;
+		break;
+	    }
+	}
+    }
+    fclose(f);
+    return ret;
+}
+
+/*
+ * set global acl flags in `context' for the current caller.
+ * return 0 on success or an error
+ */
+
+kadm5_ret_t
+_kadm5_acl_init(kadm5_server_context *context)
+{
+    krb5_principal princ;
+    krb5_error_code ret;
+    
+    ret = krb5_parse_name(context->context, KADM5_ADMIN_SERVICE, &princ);
+    if (ret)
+	return ret;
+    ret = krb5_principal_compare(context->context, context->caller, princ);
+    krb5_free_principal(context->context, princ);
+    if(ret != 0) {
+	context->acl_flags = KADM5_PRIV_ALL;
+	return 0;
+    }
+
+    return fetch_acl (context, NULL, &context->acl_flags);
+}
+
+/*
+ * check if `flags' allows `op'
+ * return 0 if OK or an error
+ */
+
+static kadm5_ret_t
+check_flags (unsigned op,
+	     unsigned flags)
+{
+    unsigned res = ~flags & op;
+
+    if(res & KADM5_PRIV_GET)
+	return KADM5_AUTH_GET;
+    if(res & KADM5_PRIV_ADD)
+	return KADM5_AUTH_ADD;
+    if(res & KADM5_PRIV_MODIFY)
+	return KADM5_AUTH_MODIFY;
+    if(res & KADM5_PRIV_DELETE)
+	return KADM5_AUTH_DELETE;
+    if(res & KADM5_PRIV_CPW)
+	return KADM5_AUTH_CHANGEPW;
+    if(res & KADM5_PRIV_LIST)
+	return KADM5_AUTH_LIST;
+    if(res)
+	return KADM5_AUTH_INSUFFICIENT;
+    return 0;
+}
+
+/*
+ * return 0 if the current caller in `context' is allowed to perform
+ * `op' on `princ' and otherwise an error
+ * princ == NULL if it's not relevant.
+ */
+
+kadm5_ret_t
+_kadm5_acl_check_permission(kadm5_server_context *context,
+			    unsigned op,
+			    krb5_const_principal princ)
+{
+    kadm5_ret_t ret;
+    unsigned princ_flags;
+
+    ret = check_flags (op, context->acl_flags);
+    if (ret == 0)
+	return ret;
+    ret = fetch_acl (context, princ, &princ_flags);
+    if (ret)
+	return ret;
+    return check_flags (op, princ_flags);
+}