Line data Source code
1 : #define _GNU_SOURCE
2 : #include "../../../../disco/tiles.h"
3 :
4 : #include "generated/sign_seccomp.h"
5 :
6 : #include "../../../../disco/keyguard/fd_keyguard.h"
7 : #include "../../../../disco/keyguard/fd_keyload.h"
8 : #include "../../../../ballet/base58/fd_base58.h"
9 :
10 : #include <errno.h>
11 : #include <sys/mman.h>
12 :
13 0 : #define MAX_IN (32UL)
14 :
15 : /* fd_sign_in_ctx_t is a context object for each in (producer) mcache
16 : connected to the sign tile. */
17 :
18 : typedef struct {
19 : ulong seq;
20 : fd_frag_meta_t * mcache;
21 : uchar * data;
22 : } fd_sign_out_ctx_t;
23 :
24 : typedef struct {
25 : uchar _data[ FD_KEYGUARD_SIGN_REQ_MTU ];
26 :
27 : /* Pre-staged with the public key base58 encoded, followed by "-" in the first bytes */
28 : ulong public_key_base58_sz;
29 : uchar concat[ FD_BASE58_ENCODED_32_SZ+1UL+9UL ];
30 :
31 : int in_role[ MAX_IN ];
32 : uchar * in_data[ MAX_IN ];
33 : ushort in_mtu [ MAX_IN ];
34 :
35 : fd_sign_out_ctx_t out[ MAX_IN ];
36 :
37 : fd_sha512_t sha512 [ 1 ];
38 :
39 : uchar const * public_key;
40 : uchar const * private_key;
41 : } fd_sign_ctx_t;
42 :
43 : FD_FN_CONST static inline ulong
44 3 : scratch_align( void ) {
45 3 : return alignof( fd_sign_ctx_t );
46 3 : }
47 :
48 : FD_FN_PURE static inline ulong
49 3 : scratch_footprint( fd_topo_tile_t const * tile ) {
50 3 : (void)tile;
51 3 : ulong l = FD_LAYOUT_INIT;
52 3 : l = FD_LAYOUT_APPEND( l, alignof( fd_sign_ctx_t ), sizeof( fd_sign_ctx_t ) );
53 3 : return FD_LAYOUT_FINI( l, scratch_align() );
54 3 : }
55 :
56 : /* during_frag is called between pairs for sequence number checks, as
57 : we are reading incoming frags. We don't actually need to copy the
58 : fragment here, see fd_dedup.c for why we do this.*/
59 :
60 : static void FD_FN_SENSITIVE
61 : during_frag_sensitive( void * _ctx,
62 : ulong in_idx,
63 : ulong seq,
64 : ulong sig,
65 : ulong chunk,
66 0 : ulong sz ) {
67 0 : (void)seq;
68 0 : (void)sig;
69 0 : (void)chunk;
70 0 : (void)sz;
71 :
72 0 : fd_sign_ctx_t * ctx = (fd_sign_ctx_t *)_ctx;
73 0 : FD_TEST( in_idx<MAX_IN );
74 :
75 0 : int role = ctx->in_role[ in_idx ];
76 0 : uint mtu = ctx->in_mtu [ in_idx ];
77 :
78 0 : if( sz>mtu ) {
79 0 : FD_LOG_EMERG(( "oversz signing request (role=%d sz=%lu mtu=%u)", role, sz, mtu ));
80 0 : }
81 0 : fd_memcpy( ctx->_data, ctx->in_data[ in_idx ], sz );
82 0 : }
83 :
84 :
85 : static void
86 : during_frag( void * _ctx,
87 : ulong in_idx,
88 : ulong seq,
89 : ulong sig,
90 : ulong chunk,
91 0 : ulong sz ) {
92 0 : during_frag_sensitive( _ctx, in_idx, seq, sig, chunk, sz );
93 0 : }
94 :
95 : static void FD_FN_SENSITIVE
96 : after_frag_sensitive( void * _ctx,
97 : ulong in_idx,
98 : ulong seq,
99 : ulong sig,
100 : ulong chunk,
101 : ulong sz,
102 : ulong tsorig,
103 0 : fd_stem_context_t * stem ) {
104 0 : (void)seq;
105 0 : (void)chunk;
106 0 : (void)tsorig;
107 0 : (void)stem;
108 :
109 0 : fd_sign_ctx_t * ctx = (fd_sign_ctx_t *)_ctx;
110 :
111 0 : int sign_type = (int)(uint)sig;
112 :
113 0 : FD_TEST( in_idx<MAX_IN );
114 :
115 0 : int role = ctx->in_role[ in_idx ];
116 :
117 0 : fd_keyguard_authority_t authority = {0};
118 0 : memcpy( authority.identity_pubkey, ctx->public_key, 32 );
119 :
120 0 : if( FD_UNLIKELY( !fd_keyguard_payload_authorize( &authority, ctx->_data, sz, role, sign_type ) ) ) {
121 0 : FD_LOG_EMERG(( "fd_keyguard_payload_authorize failed (role=%d sign_type=%d)", role, sign_type ));
122 0 : }
123 :
124 0 : switch( sign_type ) {
125 0 : case FD_KEYGUARD_SIGN_TYPE_ED25519: {
126 0 : fd_ed25519_sign( ctx->out[ in_idx ].data, ctx->_data, sz, ctx->public_key, ctx->private_key, ctx->sha512 );
127 0 : break;
128 0 : }
129 0 : case FD_KEYGUARD_SIGN_TYPE_SHA256_ED25519: {
130 0 : uchar hash[ 32 ];
131 0 : fd_sha256_hash( ctx->_data, sz, hash );
132 0 : fd_ed25519_sign( ctx->out[ in_idx ].data, hash, 32UL, ctx->public_key, ctx->private_key, ctx->sha512 );
133 0 : break;
134 0 : }
135 0 : case FD_KEYGUARD_SIGN_TYPE_PUBKEY_CONCAT_ED25519: {
136 0 : memcpy( ctx->concat+ctx->public_key_base58_sz+1UL, ctx->_data, 9UL );
137 0 : fd_ed25519_sign( ctx->out[ in_idx ].data, ctx->concat, ctx->public_key_base58_sz+1UL+9UL, ctx->public_key, ctx->private_key, ctx->sha512 );
138 0 : break;
139 0 : }
140 0 : default:
141 0 : FD_LOG_EMERG(( "invalid sign type: %d", sign_type ));
142 0 : }
143 :
144 0 : fd_mcache_publish( ctx->out[ in_idx ].mcache, 128UL, ctx->out[ in_idx ].seq, 0UL, 0UL, 0UL, 0UL, 0UL, 0UL );
145 0 : ctx->out[ in_idx ].seq = fd_seq_inc( ctx->out[ in_idx ].seq, 1UL );
146 0 : }
147 :
148 : static void
149 : after_frag( void * _ctx,
150 : ulong in_idx,
151 : ulong seq,
152 : ulong sig,
153 : ulong chunk,
154 : ulong sz,
155 : ulong tsorig,
156 0 : fd_stem_context_t * stem ) {
157 0 : after_frag_sensitive( _ctx, in_idx, seq, sig, chunk, sz, tsorig, stem );
158 0 : }
159 :
160 : static void FD_FN_SENSITIVE
161 : privileged_init_sensitive( fd_topo_t * topo,
162 0 : fd_topo_tile_t * tile ) {
163 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
164 :
165 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
166 0 : fd_sign_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_sign_ctx_t ), sizeof( fd_sign_ctx_t ) );
167 :
168 0 : uchar const * identity_key = fd_keyload_load( tile->sign.identity_key_path, /* pubkey only: */ 0 );
169 0 : ctx->private_key = identity_key;
170 0 : ctx->public_key = identity_key + 32UL;
171 :
172 : /* The stack can be taken over and reorganized by under AddressSanitizer,
173 : which causes this code to fail. */
174 : #if FD_HAS_ASAN
175 : FD_LOG_WARNING(( "!!! SECURITY WARNING !!! YOU ARE RUNNING THE SIGNING TILE "
176 : "WITH ADDRESS SANITIZER ENABLED. THIS CAN LEAK SENSITIVE "
177 : "DATA INCLUDING YOUR PRIVATE KEYS INTO CORE DUMPS IF THIS "
178 : "PROCESS ABORTS. IT IS HIGHLY ADVISED TO NOT TO RUN IN THIS "
179 : "MODE IN PRODUCTION!" ));
180 : #else
181 : /* Prevent the stack from showing up in core dumps just in case the
182 : private key somehow ends up in there. */
183 0 : FD_TEST( fd_tile_stack0() );
184 0 : FD_TEST( fd_tile_stack_sz() );
185 0 : if( FD_UNLIKELY( madvise( (void*)fd_tile_stack0(), fd_tile_stack_sz(), MADV_DONTDUMP ) ) )
186 0 : FD_LOG_ERR(( "madvise failed (%i-%s)", errno, fd_io_strerror( errno ) ));
187 0 : #endif
188 0 : }
189 :
190 : static void
191 : privileged_init( fd_topo_t * topo,
192 0 : fd_topo_tile_t * tile ) {
193 0 : privileged_init_sensitive( topo, tile );
194 0 : }
195 :
196 : static void FD_FN_SENSITIVE
197 : unprivileged_init_sensitive( fd_topo_t * topo,
198 0 : fd_topo_tile_t * tile ) {
199 0 : void * scratch = fd_topo_obj_laddr( topo, tile->tile_obj_id );
200 :
201 0 : FD_SCRATCH_ALLOC_INIT( l, scratch );
202 0 : fd_sign_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof( fd_sign_ctx_t ), sizeof( fd_sign_ctx_t ) );
203 0 : FD_TEST( fd_sha512_join( fd_sha512_new( ctx->sha512 ) ) );
204 :
205 0 : uchar check_public_key[ 32 ];
206 0 : fd_ed25519_public_from_private( check_public_key, ctx->private_key, ctx->sha512 );
207 0 : if( FD_UNLIKELY( memcmp( check_public_key, ctx->public_key, 32 ) ) )
208 0 : FD_LOG_EMERG(( "The public key in the identity key file does not match the public key derived from the private key. "
209 0 : "Firedancer will not use the key pair to sign as it might leak the private key." ));
210 :
211 0 : FD_TEST( tile->in_cnt<=MAX_IN );
212 0 : FD_TEST( tile->in_cnt==tile->out_cnt );
213 :
214 0 : fd_base58_encode_32( ctx->public_key, &ctx->public_key_base58_sz, (char *)ctx->concat );
215 0 : ctx->concat[ ctx->public_key_base58_sz ] = '-';
216 :
217 0 : for( ulong i=0; i<MAX_IN; i++ ) ctx->in_role[ i ] = -1;
218 :
219 0 : for( ulong i=0; i<tile->in_cnt; i++ ) {
220 0 : fd_topo_link_t * in_link = &topo->links[ tile->in_link_id[ i ] ];
221 0 : fd_topo_link_t * out_link = &topo->links[ tile->out_link_id[ i ] ];
222 :
223 0 : if( in_link->mtu > FD_KEYGUARD_SIGN_REQ_MTU ) FD_LOG_CRIT(( "oversz link[%lu].mtu=%lu", i, in_link->mtu ));
224 0 : ctx->in_data[ i ] = in_link->dcache;
225 0 : ctx->in_mtu [ i ] = (ushort)in_link->mtu;
226 :
227 0 : ctx->out[ i ].mcache = out_link->mcache;
228 0 : ctx->out[ i ].data = out_link->dcache;
229 0 : ctx->out[ i ].seq = 0UL;
230 :
231 0 : if( !strcmp( in_link->name, "shred_sign" ) ) {
232 0 : ctx->in_role[ i ] = FD_KEYGUARD_ROLE_LEADER;
233 0 : FD_TEST( !strcmp( out_link->name, "sign_shred" ) );
234 0 : FD_TEST( in_link->mtu==32UL );
235 0 : FD_TEST( out_link->mtu==64UL );
236 0 : } else if ( !strcmp( in_link->name, "gossip_sign" ) ) {
237 0 : ctx->in_role[ i ] = FD_KEYGUARD_ROLE_GOSSIP;
238 0 : FD_TEST( !strcmp( out_link->name, "sign_gossip" ) );
239 0 : FD_TEST( in_link->mtu==2048UL );
240 0 : FD_TEST( out_link->mtu==64UL );
241 0 : } else if ( !strcmp( in_link->name, "repair_sign")) {
242 0 : ctx->in_role[ i ] = FD_KEYGUARD_ROLE_REPAIR;
243 0 : FD_TEST( !strcmp( out_link->name, "sign_repair" ) );
244 0 : FD_TEST( in_link->mtu==2048UL );
245 0 : FD_TEST( out_link->mtu==64UL );
246 0 : } else if ( !strcmp(in_link->name, "voter_sign" ) ) {
247 0 : ctx->in_role[ i ] = FD_KEYGUARD_ROLE_VOTER;
248 0 : FD_TEST( !strcmp( out_link->name, "sign_voter" ) );
249 0 : FD_TEST( in_link->mtu==FD_TXN_MTU );
250 0 : FD_TEST( out_link->mtu==64UL );
251 0 : } else if( !strcmp(in_link->name, "bundle_sign" ) ) {
252 0 : ctx->in_role[ i ] = FD_KEYGUARD_ROLE_BUNDLE;
253 0 : FD_TEST( !strcmp( out_link->name, "sign_bundle" ) );
254 0 : FD_TEST( in_link->mtu==9UL );
255 0 : FD_TEST( out_link->mtu==64UL );
256 0 : } else {
257 0 : FD_LOG_CRIT(( "unexpected link %s", in_link->name ));
258 0 : }
259 0 : }
260 :
261 0 : ulong scratch_top = FD_SCRATCH_ALLOC_FINI( l, 1UL );
262 0 : if( FD_UNLIKELY( scratch_top > (ulong)scratch + scratch_footprint( tile ) ) )
263 0 : FD_LOG_ERR(( "scratch overflow %lu %lu %lu", scratch_top - (ulong)scratch - scratch_footprint( tile ), scratch_top, (ulong)scratch + scratch_footprint( tile ) ));
264 0 : }
265 :
266 : static void
267 : unprivileged_init( fd_topo_t * topo,
268 0 : fd_topo_tile_t * tile ) {
269 0 : unprivileged_init_sensitive( topo, tile );
270 0 : }
271 :
272 : static ulong
273 : populate_allowed_seccomp( fd_topo_t const * topo,
274 : fd_topo_tile_t const * tile,
275 : ulong out_cnt,
276 0 : struct sock_filter * out ) {
277 0 : (void)topo;
278 0 : (void)tile;
279 :
280 0 : populate_sock_filter_policy_sign( out_cnt, out, (uint)fd_log_private_logfile_fd() );
281 0 : return sock_filter_policy_sign_instr_cnt;
282 0 : }
283 :
284 : static ulong
285 : populate_allowed_fds( fd_topo_t const * topo,
286 : fd_topo_tile_t const * tile,
287 : ulong out_fds_cnt,
288 0 : int * out_fds ) {
289 0 : (void)topo;
290 0 : (void)tile;
291 :
292 0 : if( FD_UNLIKELY( out_fds_cnt<2UL ) ) FD_LOG_ERR(( "out_fds_cnt %lu", out_fds_cnt ));
293 :
294 0 : ulong out_cnt = 0;
295 0 : out_fds[ out_cnt++ ] = 2; /* stderr */
296 0 : if( FD_LIKELY( -1!=fd_log_private_logfile_fd() ) )
297 0 : out_fds[ out_cnt++ ] = fd_log_private_logfile_fd(); /* logfile */
298 0 : return out_cnt;
299 0 : }
300 :
301 0 : #define STEM_BURST (1UL)
302 :
303 : /* See explanation in fd_pack */
304 0 : #define STEM_LAZY (128L*3000L)
305 :
306 0 : #define STEM_CALLBACK_CONTEXT_TYPE fd_sign_ctx_t
307 0 : #define STEM_CALLBACK_CONTEXT_ALIGN alignof(fd_sign_ctx_t)
308 :
309 0 : #define STEM_CALLBACK_DURING_FRAG during_frag
310 0 : #define STEM_CALLBACK_AFTER_FRAG after_frag
311 :
312 : #include "../../../../disco/stem/fd_stem.c"
313 :
314 : fd_topo_run_tile_t fd_tile_sign = {
315 : .name = "sign",
316 : .populate_allowed_seccomp = populate_allowed_seccomp,
317 : .populate_allowed_fds = populate_allowed_fds,
318 : .scratch_align = scratch_align,
319 : .scratch_footprint = scratch_footprint,
320 : .privileged_init = privileged_init,
321 : .unprivileged_init = unprivileged_init,
322 : .run = stem_run,
323 : };
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