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61#include <linux/types.h>
62#include <linux/jiffies.h>
63#include <linux/sunrpc/gss_krb5.h>
64#include <linux/random.h>
65#include <linux/crypto.h>
66
67#ifdef RPC_DEBUG
68# define RPCDBG_FACILITY RPCDBG_AUTH
69#endif
70
71DEFINE_SPINLOCK(krb5_seq_lock);
72
73static char *
74setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token)
75{
76 __be16 *ptr, *krb5_hdr;
77 int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
78
79 token->len = g_token_size(&ctx->mech_used, body_size);
80
81 ptr = (__be16 *)token->data;
82 g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr);
83
84
85 krb5_hdr = ptr;
86 *ptr++ = KG_TOK_MIC_MSG;
87 *ptr++ = cpu_to_le16(ctx->gk5e->signalg);
88 *ptr++ = SEAL_ALG_NONE;
89 *ptr++ = 0xffff;
90
91 return (char *)krb5_hdr;
92}
93
94static void *
95setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
96{
97 __be16 *ptr, *krb5_hdr;
98 u8 *p, flags = 0x00;
99
100 if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
101 flags |= 0x01;
102 if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
103 flags |= 0x04;
104
105
106
107 krb5_hdr = ptr = (__be16 *)token->data;
108
109 *ptr++ = KG2_TOK_MIC;
110 p = (u8 *)ptr;
111 *p++ = flags;
112 *p++ = 0xff;
113 ptr = (__be16 *)p;
114 *ptr++ = 0xffff;
115 *ptr++ = 0xffff;
116
117 token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
118 return krb5_hdr;
119}
120
121static u32
122gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
123 struct xdr_netobj *token)
124{
125 char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
126 struct xdr_netobj md5cksum = {.len = sizeof(cksumdata),
127 .data = cksumdata};
128 void *ptr;
129 s32 now;
130 u32 seq_send;
131 u8 *cksumkey;
132
133 dprintk("RPC: %s\n", __func__);
134 BUG_ON(ctx == NULL);
135
136 now = get_seconds();
137
138 ptr = setup_token(ctx, token);
139
140 if (ctx->gk5e->keyed_cksum)
141 cksumkey = ctx->cksum;
142 else
143 cksumkey = NULL;
144
145 if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
146 KG_USAGE_SIGN, &md5cksum))
147 return GSS_S_FAILURE;
148
149 memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
150
151 spin_lock(&krb5_seq_lock);
152 seq_send = ctx->seq_send++;
153 spin_unlock(&krb5_seq_lock);
154
155 if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff,
156 seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))
157 return GSS_S_FAILURE;
158
159 return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
160}
161
162static u32
163gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
164 struct xdr_netobj *token)
165{
166 char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
167 struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
168 .data = cksumdata};
169 void *krb5_hdr;
170 s32 now;
171 u64 seq_send;
172 u8 *cksumkey;
173 unsigned int cksum_usage;
174
175 dprintk("RPC: %s\n", __func__);
176
177 krb5_hdr = setup_token_v2(ctx, token);
178
179
180
181 spin_lock(&krb5_seq_lock);
182 seq_send = ctx->seq_send64++;
183 spin_unlock(&krb5_seq_lock);
184 *((u64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
185
186 if (ctx->initiate) {
187 cksumkey = ctx->initiator_sign;
188 cksum_usage = KG_USAGE_INITIATOR_SIGN;
189 } else {
190 cksumkey = ctx->acceptor_sign;
191 cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
192 }
193
194 if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
195 text, 0, cksumkey, cksum_usage, &cksumobj))
196 return GSS_S_FAILURE;
197
198 memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
199
200 now = get_seconds();
201
202 return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
203}
204
205u32
206gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
207 struct xdr_netobj *token)
208{
209 struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
210
211 switch (ctx->enctype) {
212 default:
213 BUG();
214 case ENCTYPE_DES_CBC_RAW:
215 case ENCTYPE_DES3_CBC_RAW:
216 case ENCTYPE_ARCFOUR_HMAC:
217 return gss_get_mic_v1(ctx, text, token);
218 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
219 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
220 return gss_get_mic_v2(ctx, text, token);
221 }
222}
223
224
