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34 #include <krb5_locl.h>
36 RCSID("$Id: rd_priv.c 21751 2007-07-31 20:42:20Z lha $");
38 krb5_error_code KRB5_LIB_FUNCTION
39 krb5_rd_priv(krb5_context context,
40 krb5_auth_context auth_context,
41 const krb5_data *inbuf,
43 krb5_replay_data *outdata)
54 krb5_data_zero(outbuf);
56 if ((auth_context->flags &
57 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
59 krb5_clear_error_string (context);
60 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
63 memset(&priv, 0, sizeof(priv));
64 ret = decode_KRB_PRIV (inbuf->data, inbuf->length, &priv, &len);
66 krb5_clear_error_string (context);
70 krb5_clear_error_string (context);
71 ret = KRB5KRB_AP_ERR_BADVERSION;
74 if (priv.msg_type != krb_priv) {
75 krb5_clear_error_string (context);
76 ret = KRB5KRB_AP_ERR_MSG_TYPE;
80 if (auth_context->remote_subkey)
81 key = auth_context->remote_subkey;
82 else if (auth_context->local_subkey)
83 key = auth_context->local_subkey;
85 key = auth_context->keyblock;
87 ret = krb5_crypto_init(context, key, 0, &crypto);
90 ret = krb5_decrypt_EncryptedData(context,
95 krb5_crypto_destroy(context, crypto);
99 ret = decode_EncKrbPrivPart (plain.data, plain.length, &part, &len);
100 krb5_data_free (&plain);
102 krb5_clear_error_string (context);
106 /* check sender address */
109 && auth_context->remote_address
110 && !krb5_address_compare (context,
111 auth_context->remote_address,
113 krb5_clear_error_string (context);
114 ret = KRB5KRB_AP_ERR_BADADDR;
118 /* check receiver address */
121 && auth_context->local_address
122 && !krb5_address_compare (context,
123 auth_context->local_address,
125 krb5_clear_error_string (context);
126 ret = KRB5KRB_AP_ERR_BADADDR;
130 /* check timestamp */
131 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
134 krb5_timeofday (context, &sec);
135 if (part.timestamp == NULL ||
137 abs(*part.timestamp - sec) > context->max_skew) {
138 krb5_clear_error_string (context);
139 ret = KRB5KRB_AP_ERR_SKEW;
144 /* XXX - check replay cache */
146 /* check sequence number. since MIT krb5 cannot generate a sequence
147 number of zero but instead generates no sequence number, we accept that
150 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
151 if ((part.seq_number == NULL
152 && auth_context->remote_seqnumber != 0)
153 || (part.seq_number != NULL
154 && *part.seq_number != auth_context->remote_seqnumber)) {
155 krb5_clear_error_string (context);
156 ret = KRB5KRB_AP_ERR_BADORDER;
159 auth_context->remote_seqnumber++;
162 ret = krb5_data_copy (outbuf, part.user_data.data, part.user_data.length);
166 if ((auth_context->flags &
167 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
168 /* if these fields are not present in the priv-part, silently
170 memset(outdata, 0, sizeof(*outdata));
172 outdata->timestamp = *part.timestamp;
174 outdata->usec = *part.usec;
176 outdata->seq = *part.seq_number;
180 free_EncKrbPrivPart (&part);
183 free_KRB_PRIV (&priv);