randomdev_soft.c (256281) | randomdev_soft.c (256381) |
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1/*- 2 * Copyright (c) 2000-2013 Mark R V Murray 3 * Copyright (c) 2004 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: --- 12 unchanged lines hidden (view full) --- 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 | 1/*- 2 * Copyright (c) 2000-2013 Mark R V Murray 3 * Copyright (c) 2004 Robert N. M. Watson 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: --- 12 unchanged lines hidden (view full) --- 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 |
29#if !defined(YARROW_RNG) && !defined(FORTUNA_RNG) 30#define YARROW_RNG 31#elif defined(YARROW_RNG) && defined(FORTUNA_RNG) 32#error "Must define either YARROW_RNG or FORTUNA_RNG" | 29#include "opt_random.h" 30 31#if !defined(RANDOM_YARROW) && !defined(RANDOM_FORTUNA) 32#define RANDOM_YARROW 33#elif defined(RANDOM_YARROW) && defined(RANDOM_FORTUNA) 34#error "Must define either RANDOM_YARROW or RANDOM_FORTUNA" |
33#endif | 35#endif |
36#if defined(RANDOM_FORTUNA) 37#error "Fortuna is not yet implemented" 38#endif |
|
34 35#include <sys/cdefs.h> | 39 40#include <sys/cdefs.h> |
36__FBSDID("$FreeBSD: stable/10/sys/dev/random/randomdev_soft.c 255379 2013-09-07 22:07:36Z markm $"); | 41__FBSDID("$FreeBSD: stable/10/sys/dev/random/randomdev_soft.c 256381 2013-10-12 15:31:36Z markm $"); |
37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/fcntl.h> 41#include <sys/kernel.h> 42#include <sys/lock.h> 43#include <sys/malloc.h> 44#include <sys/module.h> 45#include <sys/mutex.h> 46#include <sys/poll.h> 47#include <sys/random.h> 48#include <sys/selinfo.h> 49#include <sys/sysctl.h> 50#include <sys/uio.h> 51#include <sys/unistd.h> 52 53#include <machine/bus.h> 54#include <machine/cpu.h> 55 | 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/fcntl.h> 46#include <sys/kernel.h> 47#include <sys/lock.h> 48#include <sys/malloc.h> 49#include <sys/module.h> 50#include <sys/mutex.h> 51#include <sys/poll.h> 52#include <sys/random.h> 53#include <sys/selinfo.h> 54#include <sys/sysctl.h> 55#include <sys/uio.h> 56#include <sys/unistd.h> 57 58#include <machine/bus.h> 59#include <machine/cpu.h> 60 |
56#include <dev/random/random_adaptors.h> | |
57#include <dev/random/randomdev.h> 58#include <dev/random/randomdev_soft.h> | 61#include <dev/random/randomdev.h> 62#include <dev/random/randomdev_soft.h> |
59#if defined(YARROW_RNG) | 63#include <dev/random/random_harvestq.h> 64#include <dev/random/random_adaptors.h> 65#if defined(RANDOM_YARROW) |
60#include <dev/random/yarrow.h> 61#endif | 66#include <dev/random/yarrow.h> 67#endif |
62#if defined(FORTUNA_RNG) | 68#if defined(RANDOM_FORTUNA) |
63#include <dev/random/fortuna.h> 64#endif 65 | 69#include <dev/random/fortuna.h> 70#endif 71 |
66#include "random_harvestq.h" | |
67 68static int randomdev_poll(int event, struct thread *td); 69static int randomdev_block(int flag); 70static void randomdev_flush_reseed(void); 71 | 72 73static int randomdev_poll(int event, struct thread *td); 74static int randomdev_block(int flag); 75static void randomdev_flush_reseed(void); 76 |
72#if defined(YARROW_RNG) | 77#if defined(RANDOM_YARROW) |
73static struct random_adaptor random_context = { 74 .ident = "Software, Yarrow", 75 .init = randomdev_init, 76 .deinit = randomdev_deinit, 77 .block = randomdev_block, 78 .read = random_yarrow_read, | 78static struct random_adaptor random_context = { 79 .ident = "Software, Yarrow", 80 .init = randomdev_init, 81 .deinit = randomdev_deinit, 82 .block = randomdev_block, 83 .read = random_yarrow_read, |
79 .write = randomdev_write, | |
80 .poll = randomdev_poll, 81 .reseed = randomdev_flush_reseed, | 84 .poll = randomdev_poll, 85 .reseed = randomdev_flush_reseed, |
82 .seeded = 1, | 86 .seeded = 0, /* This will be seeded during entropy processing */ |
83}; 84#define RANDOM_MODULE_NAME yarrow 85#define RANDOM_CSPRNG_NAME "yarrow" 86#endif 87 | 87}; 88#define RANDOM_MODULE_NAME yarrow 89#define RANDOM_CSPRNG_NAME "yarrow" 90#endif 91 |
88#if defined(FORTUNA_RNG) | 92#if defined(RANDOM_FORTUNA) |
89static struct random_adaptor random_context = { 90 .ident = "Software, Fortuna", 91 .init = randomdev_init, 92 .deinit = randomdev_deinit, 93 .block = randomdev_block, 94 .read = random_fortuna_read, | 93static struct random_adaptor random_context = { 94 .ident = "Software, Fortuna", 95 .init = randomdev_init, 96 .deinit = randomdev_deinit, 97 .block = randomdev_block, 98 .read = random_fortuna_read, |
95 .write = randomdev_write, | |
96 .poll = randomdev_poll, 97 .reseed = randomdev_flush_reseed, | 99 .poll = randomdev_poll, 100 .reseed = randomdev_flush_reseed, |
98 .seeded = 1, | 101 .seeded = 0, /* This will be excplicitly seeded at startup when secured */ |
99}; 100#define RANDOM_MODULE_NAME fortuna 101#define RANDOM_CSPRNG_NAME "fortuna" | 102}; 103#define RANDOM_MODULE_NAME fortuna 104#define RANDOM_CSPRNG_NAME "fortuna" |
102 | |
103#endif 104 | 105#endif 106 |
107TUNABLE_INT("kern.random.sys.seeded", &random_context.seeded); 108 |
|
105/* List for the dynamic sysctls */ 106static struct sysctl_ctx_list random_clist; 107 108/* ARGSUSED */ 109static int 110random_check_boolean(SYSCTL_HANDLER_ARGS) 111{ 112 if (oidp->oid_arg1 != NULL && *(u_int *)(oidp->oid_arg1) != 0) 113 *(u_int *)(oidp->oid_arg1) = 1; | 109/* List for the dynamic sysctls */ 110static struct sysctl_ctx_list random_clist; 111 112/* ARGSUSED */ 113static int 114random_check_boolean(SYSCTL_HANDLER_ARGS) 115{ 116 if (oidp->oid_arg1 != NULL && *(u_int *)(oidp->oid_arg1) != 0) 117 *(u_int *)(oidp->oid_arg1) = 1; |
114 return sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); | 118 return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req)); |
115} 116 117void 118randomdev_init(void) 119{ 120 struct sysctl_oid *random_sys_o, *random_sys_harvest_o; 121 | 119} 120 121void 122randomdev_init(void) 123{ 124 struct sysctl_oid *random_sys_o, *random_sys_harvest_o; 125 |
122#if defined(YARROW_RNG) | 126#if defined(RANDOM_YARROW) |
123 random_yarrow_init_alg(&random_clist); 124#endif | 127 random_yarrow_init_alg(&random_clist); 128#endif |
125#if defined(FORTUNA_RNG) | 129#if defined(RANDOM_FORTUNA) |
126 random_fortuna_init_alg(&random_clist); 127#endif 128 129 random_sys_o = SYSCTL_ADD_NODE(&random_clist, 130 SYSCTL_STATIC_CHILDREN(_kern_random), 131 OID_AUTO, "sys", CTLFLAG_RW, 0, 132 "Entropy Device Parameters"); 133 134 SYSCTL_ADD_PROC(&random_clist, 135 SYSCTL_CHILDREN(random_sys_o), 136 OID_AUTO, "seeded", CTLTYPE_INT | CTLFLAG_RW, | 130 random_fortuna_init_alg(&random_clist); 131#endif 132 133 random_sys_o = SYSCTL_ADD_NODE(&random_clist, 134 SYSCTL_STATIC_CHILDREN(_kern_random), 135 OID_AUTO, "sys", CTLFLAG_RW, 0, 136 "Entropy Device Parameters"); 137 138 SYSCTL_ADD_PROC(&random_clist, 139 SYSCTL_CHILDREN(random_sys_o), 140 OID_AUTO, "seeded", CTLTYPE_INT | CTLFLAG_RW, |
137 &random_context.seeded, 1, random_check_boolean, "I", | 141 &random_context.seeded, 0, random_check_boolean, "I", |
138 "Seeded State"); 139 140 random_sys_harvest_o = SYSCTL_ADD_NODE(&random_clist, 141 SYSCTL_CHILDREN(random_sys_o), 142 OID_AUTO, "harvest", CTLFLAG_RW, 0, 143 "Entropy Sources"); 144 145 SYSCTL_ADD_PROC(&random_clist, --- 4 unchanged lines hidden (view full) --- 150 SYSCTL_ADD_PROC(&random_clist, 151 SYSCTL_CHILDREN(random_sys_harvest_o), 152 OID_AUTO, "point_to_point", CTLTYPE_INT | CTLFLAG_RW, 153 &harvest.point_to_point, 1, random_check_boolean, "I", 154 "Harvest serial net entropy"); 155 SYSCTL_ADD_PROC(&random_clist, 156 SYSCTL_CHILDREN(random_sys_harvest_o), 157 OID_AUTO, "interrupt", CTLTYPE_INT | CTLFLAG_RW, | 142 "Seeded State"); 143 144 random_sys_harvest_o = SYSCTL_ADD_NODE(&random_clist, 145 SYSCTL_CHILDREN(random_sys_o), 146 OID_AUTO, "harvest", CTLFLAG_RW, 0, 147 "Entropy Sources"); 148 149 SYSCTL_ADD_PROC(&random_clist, --- 4 unchanged lines hidden (view full) --- 154 SYSCTL_ADD_PROC(&random_clist, 155 SYSCTL_CHILDREN(random_sys_harvest_o), 156 OID_AUTO, "point_to_point", CTLTYPE_INT | CTLFLAG_RW, 157 &harvest.point_to_point, 1, random_check_boolean, "I", 158 "Harvest serial net entropy"); 159 SYSCTL_ADD_PROC(&random_clist, 160 SYSCTL_CHILDREN(random_sys_harvest_o), 161 OID_AUTO, "interrupt", CTLTYPE_INT | CTLFLAG_RW, |
158 &harvest.interrupt, 0, random_check_boolean, "I", | 162 &harvest.interrupt, 1, random_check_boolean, "I", |
159 "Harvest IRQ entropy"); 160 SYSCTL_ADD_PROC(&random_clist, 161 SYSCTL_CHILDREN(random_sys_harvest_o), 162 OID_AUTO, "swi", CTLTYPE_INT | CTLFLAG_RW, | 163 "Harvest IRQ entropy"); 164 SYSCTL_ADD_PROC(&random_clist, 165 SYSCTL_CHILDREN(random_sys_harvest_o), 166 OID_AUTO, "swi", CTLTYPE_INT | CTLFLAG_RW, |
163 &harvest.swi, 0, random_check_boolean, "I", | 167 &harvest.swi, 1, random_check_boolean, "I", |
164 "Harvest SWI entropy"); 165 166 random_harvestq_init(random_process_event); 167 168 /* Register the randomness harvesting routine */ 169 randomdev_init_harvester(random_harvestq_internal, 170 random_context.read); 171} --- 5 unchanged lines hidden (view full) --- 177 randomdev_deinit_harvester(); 178 179 /* 180 * Command the hash/reseed thread to end and wait for it to finish 181 */ 182 random_kthread_control = -1; 183 tsleep((void *)&random_kthread_control, 0, "term", 0); 184 | 168 "Harvest SWI entropy"); 169 170 random_harvestq_init(random_process_event); 171 172 /* Register the randomness harvesting routine */ 173 randomdev_init_harvester(random_harvestq_internal, 174 random_context.read); 175} --- 5 unchanged lines hidden (view full) --- 181 randomdev_deinit_harvester(); 182 183 /* 184 * Command the hash/reseed thread to end and wait for it to finish 185 */ 186 random_kthread_control = -1; 187 tsleep((void *)&random_kthread_control, 0, "term", 0); 188 |
185#if defined(YARROW_RNG) | 189#if defined(RANDOM_YARROW) |
186 random_yarrow_deinit_alg(); 187#endif | 190 random_yarrow_deinit_alg(); 191#endif |
188#if defined(FORTUNA_RNG) | 192#if defined(RANDOM_FORTUNA) |
189 random_fortuna_deinit_alg(); 190#endif 191 192 sysctl_ctx_free(&random_clist); 193} 194 195void | 193 random_fortuna_deinit_alg(); 194#endif 195 196 sysctl_ctx_free(&random_clist); 197} 198 199void |
196randomdev_write(void *buf, int count) 197{ 198 int i; 199 u_int chunk; 200 201 /* 202 * Break the input up into HARVESTSIZE chunks. The writer has too 203 * much control here, so "estimate" the entropy as zero. 204 */ 205 for (i = 0; i < count; i += HARVESTSIZE) { 206 chunk = HARVESTSIZE; 207 if (i + chunk >= count) 208 chunk = (u_int)(count - i); 209 random_harvestq_internal(get_cyclecount(), (char *)buf + i, 210 chunk, 0, 0, RANDOM_WRITE); 211 } 212} 213 214void | |
215randomdev_unblock(void) 216{ 217 if (!random_context.seeded) { | 200randomdev_unblock(void) 201{ 202 if (!random_context.seeded) { |
218 random_context.seeded = 1; | |
219 selwakeuppri(&random_context.rsel, PUSER); 220 wakeup(&random_context); | 203 selwakeuppri(&random_context.rsel, PUSER); 204 wakeup(&random_context); |
205 printf("random: unblocking device.\n"); 206 random_context.seeded = 1; |
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221 } | 207 } |
208 /* Do arc4random(9) a favour while we are about it. */ |
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222 (void)atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_NONE, 223 ARC4_ENTR_HAVE); 224} 225 226static int 227randomdev_poll(int events, struct thread *td) 228{ 229 int revents = 0; | 209 (void)atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_NONE, 210 ARC4_ENTR_HAVE); 211} 212 213static int 214randomdev_poll(int events, struct thread *td) 215{ 216 int revents = 0; |
217 |
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230 mtx_lock(&random_reseed_mtx); 231 232 if (random_context.seeded) 233 revents = events & (POLLIN | POLLRDNORM); 234 else 235 selrecord(td, &random_context.rsel); 236 237 mtx_unlock(&random_reseed_mtx); | 218 mtx_lock(&random_reseed_mtx); 219 220 if (random_context.seeded) 221 revents = events & (POLLIN | POLLRDNORM); 222 else 223 selrecord(td, &random_context.rsel); 224 225 mtx_unlock(&random_reseed_mtx); |
238 return revents; | 226 return (revents); |
239} 240 241static int 242randomdev_block(int flag) 243{ 244 int error = 0; 245 246 mtx_lock(&random_reseed_mtx); 247 248 /* Blocking logic */ 249 while (!random_context.seeded && !error) { 250 if (flag & O_NONBLOCK) 251 error = EWOULDBLOCK; 252 else { | 227} 228 229static int 230randomdev_block(int flag) 231{ 232 int error = 0; 233 234 mtx_lock(&random_reseed_mtx); 235 236 /* Blocking logic */ 237 while (!random_context.seeded && !error) { 238 if (flag & O_NONBLOCK) 239 error = EWOULDBLOCK; 240 else { |
253 printf("Entropy device is blocking.\n"); | 241 printf("random: blocking on read.\n"); |
254 error = msleep(&random_context, 255 &random_reseed_mtx, 256 PUSER | PCATCH, "block", 0); 257 } 258 } 259 mtx_unlock(&random_reseed_mtx); 260 | 242 error = msleep(&random_context, 243 &random_reseed_mtx, 244 PUSER | PCATCH, "block", 0); 245 } 246 } 247 mtx_unlock(&random_reseed_mtx); 248 |
261 return error; | 249 return (error); |
262} 263 264/* Helper routine to perform explicit reseeds */ 265static void 266randomdev_flush_reseed(void) 267{ 268 /* Command a entropy queue flush and wait for it to finish */ 269 random_kthread_control = 1; 270 while (random_kthread_control) 271 pause("-", hz / 10); 272 | 250} 251 252/* Helper routine to perform explicit reseeds */ 253static void 254randomdev_flush_reseed(void) 255{ 256 /* Command a entropy queue flush and wait for it to finish */ 257 random_kthread_control = 1; 258 while (random_kthread_control) 259 pause("-", hz / 10); 260 |
273#if defined(YARROW_RNG) | 261#if defined(RANDOM_YARROW) 262 /* This ultimately calls randomdev_unblock() */ |
274 random_yarrow_reseed(); 275#endif | 263 random_yarrow_reseed(); 264#endif |
276#if defined(FORTUNA_RNG) | 265#if defined(RANDOM_FORTUNA) 266 /* This ultimately calls randomdev_unblock() */ |
277 random_fortuna_reseed(); 278#endif 279} 280 281static int | 267 random_fortuna_reseed(); 268#endif 269} 270 271static int |
282randomdev_modevent(module_t mod, int type, void *unused) | 272randomdev_modevent(module_t mod __unused, int type, void *unused __unused) |
283{ 284 285 switch (type) { 286 case MOD_LOAD: 287 random_adaptor_register(RANDOM_CSPRNG_NAME, &random_context); 288 /* 289 * For statically built kernels that contain both device 290 * random and options PADLOCK_RNG/RDRAND_RNG/etc.., --- 17 unchanged lines hidden --- | 273{ 274 275 switch (type) { 276 case MOD_LOAD: 277 random_adaptor_register(RANDOM_CSPRNG_NAME, &random_context); 278 /* 279 * For statically built kernels that contain both device 280 * random and options PADLOCK_RNG/RDRAND_RNG/etc.., --- 17 unchanged lines hidden --- |