crypto/dist/heimdal/appl/ftp/ftpd/gss_userok.c

   1 /*
   2  * Copyright (c) 1998 - 2001 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 "ftpd_locl.h"
  35 #include <gssapi.h>
  36 #include <krb5.h>
  37
  38 __RCSID("$Heimdal: gss_userok.c 21222 2007-06-20 10:11:14Z lha $"
  39         "$NetBSD$");
  40
  41 /* XXX a bit too much of krb5 dependency here...
  42    What is the correct way to do this?
  43    */
  44
  45 struct gss_krb5_data {
  46     krb5_context context;
  47 };
  48
  49 /* XXX sync with gssapi.c */
  50 struct gss_data {
  51     gss_ctx_id_t context_hdl;
  52     char *client_name;
  53     gss_cred_id_t delegated_cred_handle;
  54     void *mech_data;
  55 };
  56
  57 int gss_userok(void*, char*); /* to keep gcc happy */
  58 int gss_session(void*, char*); /* to keep gcc happy */
  59
  60 int
  61 gss_userok(void *app_data, char *username)
  62 {
  63     struct gss_data *data = app_data;
  64     krb5_error_code ret;
  65     krb5_principal client;
  66     struct gss_krb5_data *kdata;
  67
  68     kdata = calloc(1, sizeof(struct gss_krb5_data));
  69     if (kdata == NULL)
  70         return 1;
  71     data->mech_data = kdata;
  72
  73     ret = krb5_init_context(&(kdata->context));
  74     if (ret) {
  75         free(kdata);
  76         return 1;
  77     }
  78
  79     ret = krb5_parse_name(kdata->context, data->client_name, &client);
  80     if(ret) {
  81         krb5_free_context(kdata->context);
  82         free(kdata);
  83         return 1;
  84     }
  85     ret = krb5_kuserok(kdata->context, client, username);
  86     if (!ret) {
  87         krb5_free_principal(kdata->context, client);
  88         krb5_free_context(kdata->context);
  89         free(kdata);
  90         return 1;
  91     }
  92
  93     ret = 0;
  94     krb5_free_principal(kdata->context, client);
  95     return ret;
  96 }
  97
  98 int
  99 gss_session(void *app_data, char *username)
 100 {
 101     struct gss_data *data = app_data;
 102     krb5_error_code ret;
 103     OM_uint32 minor_status;
 104     struct gss_krb5_data *kdata;
 105
 106     ret = 0;
 107
 108     kdata = (struct gss_krb5_data *)(data->mech_data);
 109
 110     /* more of krb-depend stuff :-( */
 111     /* gss_add_cred() ? */
 112     if (data->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
 113         krb5_ccache ccache = NULL;
 114         const char* ticketfile;
 115         struct passwd *kpw;
 116
 117         ret = krb5_cc_gen_new(kdata->context, &krb5_fcc_ops, &ccache);
 118         if (ret)
 119             goto fail;
 120
 121         ticketfile = krb5_cc_get_name(kdata->context, ccache);
 122
 123         ret = gss_krb5_copy_ccache(&minor_status,
 124                                    data->delegated_cred_handle,
 125                                    ccache);
 126         if (ret) {
 127             ret = 0;
 128             goto fail;
 129         }
 130
 131         do_destroy_tickets = 1;
 132
 133         kpw = getpwnam(username);
 134
 135         if (kpw == NULL) {
 136             unlink(ticketfile);
 137             ret = 1;
 138             goto fail;
 139         }
 140
 141         chown (ticketfile, kpw->pw_uid, kpw->pw_gid);
 142
 143         if (asprintf(&k5ccname, "FILE:%s", ticketfile) != -1) {
 144             esetenv ("KRB5CCNAME", k5ccname, 1);
 145         }
 146         afslog(NULL, 1);
 147     fail:
 148         if (ccache)
 149             krb5_cc_close(kdata->context, ccache);
 150     }
 151
 152     gss_release_cred(&minor_status, &data->delegated_cred_handle);
 153     krb5_free_context(kdata->context);
 154     free(kdata);
 155     return ret;
 156 }