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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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
68# define RPCDBG_FACILITY RPCDBG_AUTH
69#endif
70
71DEFINE_SPINLOCK(krb5_seq_lock);
72
73static void *
74setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token)
75{
76 u16 *ptr;
77 void *krb5_hdr;
78 int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
79
80 token->len = g_token_size(&ctx->mech_used, body_size);
81
82 ptr = (u16 *)token->data;
83 g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr);
84
85
86 krb5_hdr = ptr;
87 *ptr++ = KG_TOK_MIC_MSG;
88
89
90
91
92 *ptr++ = (__force u16)cpu_to_le16(ctx->gk5e->signalg);
93 *ptr++ = SEAL_ALG_NONE;
94 *ptr = 0xffff;
95
96 return krb5_hdr;
97}
98
99static void *
100setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
101{
102 u16 *ptr;
103 void *krb5_hdr;
104 u8 *p, flags = 0x00;
105
106 if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
107 flags |= 0x01;
108 if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
109 flags |= 0x04;
110
111
112
113 krb5_hdr = ptr = (u16 *)token->data;
114
115 *ptr++ = KG2_TOK_MIC;
116 p = (u8 *)ptr;
117 *p++ = flags;
118 *p++ = 0xff;
119 ptr = (u16 *)p;
120 *ptr++ = 0xffff;
121 *ptr = 0xffff;
122
123 token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
124 return krb5_hdr;
125}
126
127static u32
128gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
129 struct xdr_netobj *token)
130{
131 char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
132 struct xdr_netobj md5cksum = {.len = sizeof(cksumdata),
133 .data = cksumdata};
134 void *ptr;
135 s32 now;
136 u32 seq_send;
137 u8 *cksumkey;
138
139 dprintk("RPC: %s\n", __func__);
140 BUG_ON(ctx == NULL);
141
142 now = get_seconds();
143
144 ptr = setup_token(ctx, token);
145
146 if (ctx->gk5e->keyed_cksum)
147 cksumkey = ctx->cksum;
148 else
149 cksumkey = NULL;
150
151 if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
152 KG_USAGE_SIGN, &md5cksum))
153 return GSS_S_FAILURE;
154
155 memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
156
157 spin_lock(&krb5_seq_lock);
158 seq_send = ctx->seq_send++;
159 spin_unlock(&krb5_seq_lock);
160
161 if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff,
162 seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))
163 return GSS_S_FAILURE;
164
165 return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
166}
167
168static u32
169gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
170 struct xdr_netobj *token)
171{
172 char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
173 struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
174 .data = cksumdata};
175 void *krb5_hdr;
176 s32 now;
177 u64 seq_send;
178 u8 *cksumkey;
179 unsigned int cksum_usage;
180 __be64 seq_send_be64;
181
182 dprintk("RPC: %s\n", __func__);
183
184 krb5_hdr = setup_token_v2(ctx, token);
185
186
187
188 spin_lock(&krb5_seq_lock);
189 seq_send = ctx->seq_send64++;
190 spin_unlock(&krb5_seq_lock);
191
192 seq_send_be64 = cpu_to_be64(seq_send);
193 memcpy(krb5_hdr + 8, (char *) &seq_send_be64, 8);
194
195 if (ctx->initiate) {
196 cksumkey = ctx->initiator_sign;
197 cksum_usage = KG_USAGE_INITIATOR_SIGN;
198 } else {
199 cksumkey = ctx->acceptor_sign;
200 cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
201 }
202
203 if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
204 text, 0, cksumkey, cksum_usage, &cksumobj))
205 return GSS_S_FAILURE;
206
207 memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
208
209 now = get_seconds();
210
211 return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
212}
213
214u32
215gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
216 struct xdr_netobj *token)
217{
218 struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
219
220 switch (ctx->enctype) {
221 default:
222 BUG();
223 case ENCTYPE_DES_CBC_RAW:
224 case ENCTYPE_DES3_CBC_RAW:
225 case ENCTYPE_ARCFOUR_HMAC:
226 return gss_get_mic_v1(ctx, text, token);
227 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
228 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
229 return gss_get_mic_v2(ctx, text, token);
230 }
231}
232
233