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3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include <krb5_locl.h>
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
);