1 /*
2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 #pragma ident "%Z%%M% %I% %E% SMI"
7
8 /*
9 * Copyright (C) 1998 by the FundsXpress, INC.
10 *
11 * All rights reserved.
12 *
13 * Export of this software from the United States of America may require
14 * a specific license from the United States Government. It is the
15 * responsibility of any person or organization contemplating export to
16 * obtain such a license before exporting.
17 *
18 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
19 * distribute this software and its documentation for any purpose and
20 * without fee is hereby granted, provided that the above copyright
21 * notice appear in all copies and that both that copyright notice and
22 * this permission notice appear in supporting documentation, and that
23 * the name of FundsXpress. not be used in advertising or publicity pertaining
24 * to distribution of the software without specific, written prior
25 * permission. FundsXpress makes no representations about the suitability of
26 * this software for any purpose. It is provided "as is" without express
27 * or implied warranty.
28 */
29
30 #include <k5-int.h>
31
32 #ifdef _KERNEL
33 #include <sys/random.h>
34 #endif
35
36 #ifndef _KERNEL
37
38 /*
39 * Solaris kerberos: we don't need a random number generator
40 * for the /dev/[u]random, as it uses entropy in the kernel.
41 * Keep this function as some apps might call it directly.
42 */
43
44 /*ARGSUSED*/
45 krb5_error_code KRB5_CALLCONV
krb5_c_random_seed(krb5_context context,krb5_data * data)46 krb5_c_random_seed(krb5_context context, krb5_data *data)
47 {
48 /*
49 * We can't do much if this fails, so ignore the
50 * return code. /dev/urandom has its own entropy
51 * source, so seeding it from here is of questionable
52 * value in the first place.
53 */
54 (void) C_SeedRandom(krb_ctx_hSession(context),
55 (CK_BYTE_PTR)data->data,
56 (CK_ULONG)data->length);
57
58 return(0);
59 }
60 #endif /* !_KERNEL */
61
62 /*
63 * krb5_get_random_octets
64 * New for Solaris 9. This routine takes advantage of the new
65 * /dev/[u]random interface provided in Solaris 9 for getting random
66 * bytes generated from the kernel. The entropy produced there is generally
67 * considered better than the current MIT PRNG code that we are replacing.
68 *
69 * This func is visible so that it can be used to generate a
70 * random confounder.
71 */
72
73 #ifndef _KERNEL
74
75 #endif /* ! _KERNEL */
76
77 /*
78 * We can assume that the memory for data is already malloc'd.
79 * Return an error if there is an error, but don't clear the data->length
80 * or free data->data. This will be done by the calling function.
81 */
82
83 /*ARGSUSED*/
84 krb5_error_code KRB5_CALLCONV
krb5_c_random_make_octets(krb5_context context,krb5_data * data)85 krb5_c_random_make_octets(krb5_context context, krb5_data *data)
86 {
87 /*
88 * Solaris kerberos uses /dev/[u]random
89 */
90 #ifndef _KERNEL /* User space code */
91
92 krb5_error_code err = 0;
93 CK_RV rv;
94
95 KRB5_LOG0(KRB5_INFO, "krb5_c_random_make_octets() start, user space using "
96 "krb5_get_random_octets()\n");
97
98 rv = C_GenerateRandom(krb_ctx_hSession(context), (CK_BYTE_PTR)data->data,
99 (CK_ULONG)data->length);
100
101 if (rv != CKR_OK) {
102 KRB5_LOG(KRB5_ERR, "C_GenerateRandom failed in "
103 "krb5_c_random_make_octets: rv = 0x%x.", rv);
104 err = PKCS_ERR;
105 }
106 if (err != 0) {
107 KRB5_LOG0(KRB5_ERR, "krb5_c_random_make_octets() end, error");
108 return (err);
109 }
110
111 #else /* Kernel code section */
112
113 /*
114 * Solaris Kerberos: for kernel code we use the randomness generator native
115 * to Solaris 9. We avoid global variables and other nastiness this way.
116 *
117 * Using random_get_pseudo_bytes() instead of random_get_bytes() because it
118 * will not return an error code if there isn't enough entropy but will use
119 * a pseudo random algorithm to produce randomness. Most of the time it
120 * should be as good as random_get_bytes() and we don't have to worry about
121 * dealing with a non-fatal error.
122 */
123 KRB5_LOG0(KRB5_INFO, "krb5_c_random_make_octets() start, kernel using "
124 "random_get_pseudo_bytes()\n ");
125
126 if(random_get_pseudo_bytes((uint8_t *)data->data, data->length) != 0) {
127 KRB5_LOG0(KRB5_ERR, "krb5_c_random_make_octets() end, "
128 "random_get_pseudo_bytes() error.\n");
129 return(KRB5_CRYPTO_INTERNAL);
130 }
131
132 #endif /* !_KERNEL */
133
134 KRB5_LOG0(KRB5_INFO, "krb5_c_random_make_octets() end\n");
135 return(0);
136 }
137