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, or the credentials were unavailable or inaccessible.",
  68         "No context has been established",
  69         "A token was invalid",
  70         "A credential was invalid",
  71         "The referenced credentials have expired",
  72         "The context has expired",
  73         "Miscellaneous failure (see text)",
  74         "The quality-of-protection requested could not be provide",
  75         "The operation is forbidden by local security policy",
  76         "The operation or option is not available",
  77         "The requested credential element already exists",
  78         "The provided name was not a mechanism name.",
  79     };
  80
  81     v >>= GSS_C_ROUTINE_ERROR_OFFSET;
  82
  83     if (v == 0)
  84         return "";
  85     else if (v >= sizeof(msgs)/sizeof(*msgs))
  86         return "unknown routine error";
  87     else
  88         return msgs[v];
  89 }
  90
  91 static const char *
  92 supplementary_error(OM_uint32 v)
  93 {
  94     static const char *msgs[] = {
  95         "normal completion",
  96         "continuation call to routine required",
  97         "duplicate per-message token detected",
  98         "timed-out per-message token detected",
  99         "reordered (early) per-message token detected",
 100         "skipped predecessor token(s) detected"
 101     };
 102
 103     v >>= GSS_C_SUPPLEMENTARY_OFFSET;
 104
 105     if (v >= sizeof(msgs)/sizeof(*msgs))
 106         return "unknown routine error";
 107     else
 108         return msgs[v];
 109 }
 110
 111 void
 112 _gsskrb5_clear_status (void)
 113 {
 114     krb5_context context;
 115
 116     if (_gsskrb5_init (&context) != 0)
 117         return;
 118     krb5_clear_error_message(context);
 119 }
 120
 121 void
 122 _gsskrb5_set_status (int ret, const char *fmt, ...)
 123 {
 124     krb5_context context;
 125     va_list args;
 126     char *str;
 127     int e;
 128
 129     if (_gsskrb5_init (&context) != 0)
 130         return;
 131
 132     va_start(args, fmt);
 133     e = vasprintf(&str, fmt, args);
 134     va_end(args);
 135     if (e >= 0 && str) {
 136         krb5_set_error_message(context, ret, "%s", str);
 137         free(str);
 138     }
 139 }
 140
 141 OM_uint32 GSSAPI_CALLCONV _gsskrb5_display_status
 142 (OM_uint32              *minor_status,
 143  OM_uint32               status_value,
 144  int                     status_type,
 145  const gss_OID   mech_type,
 146  OM_uint32              *message_context,
 147  gss_buffer_t    status_string)
 148 {
 149     krb5_context context;
 150     char *buf = NULL;
 151     int e = 0;
 152
 153     GSSAPI_KRB5_INIT (&context);
 154
 155     status_string->length = 0;
 156     status_string->value = NULL;
 157
 158     if (gss_oid_equal(mech_type, GSS_C_NO_OID) == 0 &&
 159         gss_oid_equal(mech_type, GSS_KRB5_MECHANISM) == 0) {
 160         *minor_status = 0;
 161         return GSS_S_BAD_MECH;
 162     }
 163
 164     if (status_type == GSS_C_GSS_CODE) {
 165         if (GSS_SUPPLEMENTARY_INFO(status_value))
 166             e = asprintf(&buf, "%s",
 167                          supplementary_error(GSS_SUPPLEMENTARY_INFO(status_value)));
 168         else
 169             e = asprintf (&buf, "%s %s",
 170                           calling_error(GSS_CALLING_ERROR(status_value)),
 171                           routine_error(GSS_ROUTINE_ERROR(status_value)));
 172     } else if (status_type == GSS_C_MECH_CODE) {
 173         const char *buf2 = krb5_get_error_message(context, status_value);
 174         if (buf2) {
 175             buf = strdup(buf2);
 176             krb5_free_error_message(context, buf2);
 177         } else {
 178             e = asprintf(&buf, "unknown mech error-code %u",
 179                          (unsigned)status_value);
 180         }
 181     } else {
 182         *minor_status = EINVAL;
 183         return GSS_S_BAD_STATUS;
 184     }
 185
 186     if (e < 0 || buf == NULL) {
 187         *minor_status = ENOMEM;
 188         return GSS_S_FAILURE;
 189     }
 190
 191     *message_context = 0;
 192     *minor_status = 0;
 193
 194     status_string->length = strlen(buf);
 195     status_string->value  = buf;
 196
 197     return GSS_S_COMPLETE;
 198 }