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