vendor/krb5/1.15.1

1 files changed, 257 insertions, 0 deletions

diff --git a/src/lib/krb5/krb/unparse.c b/src/lib/krb5/krb/unparse.c
new file mode 100644
index 0000000000000..5bb64d00ad74a
--- /dev/null
+++ b/src/lib/krb5/krb/unparse.c
@@ -0,0 +1,257 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/krb5/krb/unparse.c */
+/*
+ * Copyright 1990, 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+/*
+ * krb5_unparse_name() routine
+ *
+ * Rewritten by Theodore Ts'o to properly unparse principal names
+ * which have the component or realm separator as part of one of their
+ * components.
+ */
+
+
+#include "k5-int.h"
+#include <stdio.h>
+
+/*
+ * converts the multi-part principal format used in the protocols to a
+ * single-string representation of the name.
+ *
+ * The name returned is in allocated storage and should be freed by
+ * the caller when finished.
+ *
+ * Conventions: / is used to separate components; @ is used to
+ * separate the realm from the rest of the name.  If '/', '@', or '\0'
+ * appear in any the component, they will be representing using
+ * backslash encoding.  ("\/", "\@", or '\0', respectively)
+ *
+ * returns error
+ *      KRB_PARSE_MALFORMED     principal is invalid (does not contain
+ *                              at least 2 components)
+ * also returns system errors
+ *      ENOMEM                  unable to allocate memory for string
+ */
+
+#define REALM_SEP       '@'
+#define COMPONENT_SEP   '/'
+
+static int
+component_length_quoted(const krb5_data *src, int flags)
+{
+    const char *cp = src->data;
+    int length = src->length;
+    int j;
+    int size = length;
+
+    if ((flags & KRB5_PRINCIPAL_UNPARSE_DISPLAY) == 0) {
+        int no_realm = (flags & KRB5_PRINCIPAL_UNPARSE_NO_REALM) &&
+            !(flags & KRB5_PRINCIPAL_UNPARSE_SHORT);
+
+        for (j = 0; j < length; j++,cp++)
+            if ((!no_realm && *cp == REALM_SEP) ||
+                *cp == COMPONENT_SEP ||
+                *cp == '\0' || *cp == '\\' || *cp == '\t' ||
+                *cp == '\n' || *cp == '\b')
+                size++;
+    }
+
+    return size;
+}
+
+static int
+copy_component_quoting(char *dest, const krb5_data *src, int flags)
+{
+    int j;
+    const char *cp = src->data;
+    char *q = dest;
+    int length = src->length;
+
+    if (flags & KRB5_PRINCIPAL_UNPARSE_DISPLAY) {
+        if (src->length > 0)
+            memcpy(dest, src->data, src->length);
+        return src->length;
+    }
+
+    for (j=0; j < length; j++,cp++) {
+        int no_realm = (flags & KRB5_PRINCIPAL_UNPARSE_NO_REALM) &&
+            !(flags & KRB5_PRINCIPAL_UNPARSE_SHORT);
+
+        switch (*cp) {
+        case REALM_SEP:
+            if (no_realm) {
+                *q++ = *cp;
+                break;
+            }
+        case COMPONENT_SEP:
+        case '\\':
+            *q++ = '\\';
+            *q++ = *cp;
+            break;
+        case '\t':
+            *q++ = '\\';
+            *q++ = 't';
+            break;
+        case '\n':
+            *q++ = '\\';
+            *q++ = 'n';
+            break;
+        case '\b':
+            *q++ = '\\';
+            *q++ = 'b';
+            break;
+#if 0
+            /* Heimdal escapes spaces in principal names upon unparsing */
+        case ' ':
+            *q++ = '\\';
+            *q++ = ' ';
+            break;
+#endif
+        case '\0':
+            *q++ = '\\';
+            *q++ = '0';
+            break;
+        default:
+            *q++ = *cp;
+        }
+    }
+    return q - dest;
+}
+
+static krb5_error_code
+k5_unparse_name(krb5_context context, krb5_const_principal principal,
+                int flags, char **name, unsigned int *size)
+{
+    char *q;
+    krb5_int32 i;
+    unsigned int totalsize = 0;
+    char *default_realm = NULL;
+    krb5_error_code ret = 0;
+
+    if (!principal || !name)
+        return KRB5_PARSE_MALFORMED;
+
+    if (flags & KRB5_PRINCIPAL_UNPARSE_SHORT) {
+        /* omit realm if local realm */
+        krb5_principal_data p;
+
+        ret = krb5_get_default_realm(context, &default_realm);
+        if (ret != 0)
+            goto cleanup;
+
+        p.realm = string2data(default_realm);
+
+        if (krb5_realm_compare(context, &p, principal))
+            flags |= KRB5_PRINCIPAL_UNPARSE_NO_REALM;
+    }
+
+    if ((flags & KRB5_PRINCIPAL_UNPARSE_NO_REALM) == 0) {
+        totalsize += component_length_quoted(&principal->realm, flags);
+        totalsize++;            /* This is for the separator */
+    }
+
+    for (i = 0; i < principal->length; i++) {
+        totalsize += component_length_quoted(&principal->data[i], flags);
+        totalsize++;    /* This is for the separator */
+    }
+    if (principal->length == 0)
+        totalsize++;
+
+    /*
+     * Allocate space for the ascii string; if space has been
+     * provided, use it, realloc'ing it if necessary.
+     *
+     * We need only n-1 seperators for n components, but we need
+     * an extra byte for the NUL at the end.
+     */
+    if (size) {
+        if (*name && (*size < totalsize)) {
+            *name = realloc(*name, totalsize);
+        } else {
+            *name = malloc(totalsize);
+        }
+        *size = totalsize;
+    } else {
+        *name = malloc(totalsize);
+    }
+
+    if (!*name) {
+        ret = ENOMEM;
+        goto cleanup;
+    }
+
+    q = *name;
+
+    for (i = 0; i < principal->length; i++) {
+        q += copy_component_quoting(q, &principal->data[i], flags);
+        *q++ = COMPONENT_SEP;
+    }
+
+    if (i > 0)
+        q--;                /* Back up last component separator */
+    if ((flags & KRB5_PRINCIPAL_UNPARSE_NO_REALM) == 0) {
+        *q++ = REALM_SEP;
+        q += copy_component_quoting(q, &principal->realm, flags);
+    }
+    *q++ = '\0';
+
+cleanup:
+    if (default_realm != NULL)
+        krb5_free_default_realm(context, default_realm);
+
+    return ret;
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_unparse_name(krb5_context context, krb5_const_principal principal, register char **name)
+{
+    if (name != NULL)                      /* name == NULL will return error from _ext */
+        *name = NULL;
+
+    return k5_unparse_name(context, principal, 0, name, NULL);
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_unparse_name_ext(krb5_context context, krb5_const_principal principal,
+                      char **name, unsigned int *size)
+{
+    return k5_unparse_name(context, principal, 0, name, size);
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_unparse_name_flags(krb5_context context, krb5_const_principal principal,
+                        int flags, char **name)
+{
+    if (name != NULL)
+        *name = NULL;
+    return k5_unparse_name(context, principal, flags, name, NULL);
+}
+
+krb5_error_code KRB5_CALLCONV
+krb5_unparse_name_flags_ext(krb5_context context, krb5_const_principal principal,
+                            int flags, char **name, unsigned int *size)
+{
+    return k5_unparse_name(context, principal, flags, name, size);
+}