lib/gssapi/krb5/display_status.c

   1 /*
   2  * Copyright (c) 1998 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "gsskrb5_locl.h"
  35
  36 static const char *
  37 calling_error(OM_uint32 v)
  38 {
  39     static const char *msgs[] = {
  40         NULL,                   /* 0 */
  41         "A required input parameter could not be read.", /*  */
  42         "A required output parameter could not be written.", /*  */
  43         "A parameter was malformed"
  44     };
  45
  46     v >>= GSS_C_CALLING_ERROR_OFFSET;
  47
  48     if (v == 0)
  49         return "";
  50     else if (v >= sizeof(msgs)/sizeof(*msgs))
  51         return "unknown calling error";
  52     else
  53         return msgs[v];
  54 }
  55
  56 static const char *
  57 routine_error(OM_uint32 v)
  58 {
  59     static const char *msgs[] = {
  60         NULL,                   /* 0 */
  61         "An unsupported mechanism was requested",
  62         "An invalid name was supplied",
  63         "A supplied name was of an unsupported type",
  64         "Incorrect channel bindings were supplied",
  65         "An invalid status code was supplied",
  66         "A token had an invalid MIC",
  67         "No credentials were supplied, "
  68         "or the credentials were unavailable or inaccessible.",
  69         "No context has been established",
  70         "A token was invalid",
  71         "A credential was invalid",
  72         "The referenced credentials have expired",
  73         "The context has expired",
  74         "Miscellaneous failure (see text)",
  75         "The quality-of-protection requested could not be provide",
  76         "The operation is forbidden by local security policy",
  77         "The operation or option is not available",
  78         "The requested credential element already exists",
  79         "The provided name was not a mechanism name.",
  80     };
  81
  82     v >>= GSS_C_ROUTINE_ERROR_OFFSET;
  83
  84     if (v == 0)
  85         return "";
  86     else if (v >= sizeof(msgs)/sizeof(*msgs))
  87         return "unknown routine error";
  88     else
  89         return msgs[v];
  90 }
  91
  92 static const char *
  93 supplementary_error(OM_uint32 v)
  94 {
  95     static const char *msgs[] = {
  96         "normal completion",
  97         "continuation call to routine required",
  98         "duplicate per-message token detected",
  99         "timed-out per-message token detected",
 100         "reordered (early) per-message token detected",
 101         "skipped predecessor token(s) detected"
 102     };
 103
 104     v >>= GSS_C_SUPPLEMENTARY_OFFSET;
 105
 106     if (v >= sizeof(msgs)/sizeof(*msgs))
 107         return "unknown routine error";
 108     else
 109         return msgs[v];
 110 }
 111
 112 void
 113 _gsskrb5_clear_status (void)
 114 {
 115     krb5_context context;
 116
 117     if (_gsskrb5_init (&context) != 0)
 118         return;
 119     krb5_clear_error_message(context);
 120 }
 121
 122 void
 123 _gsskrb5_set_status (int ret, const char *fmt, ...)
 124 {
 125     krb5_context context;
 126     va_list args;
 127     char *str;
 128     int e;
 129
 130     if (_gsskrb5_init (&context) != 0)
 131         return;
 132
 133     va_start(args, fmt);
 134     e = vasprintf(&str, fmt, args);
 135     va_end(args);
 136     if (e >= 0 && str) {
 137         krb5_set_error_message(context, ret, "%s", str);
 138         free(str);
 139     }
 140 }
 141
 142 OM_uint32 GSSAPI_CALLCONV _gsskrb5_display_status
 143 (OM_uint32              *minor_status,
 144  OM_uint32               status_value,
 145  int                     status_type,
 146  const gss_OID   mech_type,
 147  OM_uint32              *message_context,
 148  gss_buffer_t    status_string)
 149 {
 150     krb5_context context;
 151     char *buf = NULL;
 152     int e = 0;
 153
 154     GSSAPI_KRB5_INIT (&context);
 155
 156     status_string->length = 0;
 157     status_string->value = NULL;
 158
 159     if (gss_oid_equal(mech_type, GSS_C_NO_OID) == 0 &&
 160         gss_oid_equal(mech_type, GSS_KRB5_MECHANISM) == 0) {
 161         *minor_status = 0;
 162         return GSS_C_GSS_CODE;
 163     }
 164
 165     if (status_type == GSS_C_GSS_CODE) {
 166         if (GSS_SUPPLEMENTARY_INFO(status_value))
 167             e = asprintf(&buf, "%s",
 168                          supplementary_error(GSS_SUPPLEMENTARY_INFO(status_value)));
 169         else
 170             e = asprintf (&buf, "%s %s",
 171                           calling_error(GSS_CALLING_ERROR(status_value)),
 172                           routine_error(GSS_ROUTINE_ERROR(status_value)));
 173     } else if (status_type == GSS_C_MECH_CODE) {
 174         const char *buf2 = krb5_get_error_message(context, status_value);
 175         if (buf2) {
 176             buf = strdup(buf2);
 177             krb5_free_error_message(context, buf2);
 178         } else {
 179             e = asprintf(&buf, "unknown mech error-code %u",
 180                          (unsigned)status_value);
 181         }
 182     } else {
 183         *minor_status = EINVAL;
 184         return GSS_S_BAD_STATUS;
 185     }
 186
 187     if (e < 0 || buf == NULL) {
 188         *minor_status = ENOMEM;
 189         return GSS_S_FAILURE;
 190     }
 191
 192     *message_context = 0;
 193     *minor_status = 0;
 194
 195     status_string->length = strlen(buf);
 196     status_string->value  = buf;
 197
 198     return GSS_S_COMPLETE;
 199 }