1 #include <u.h> 2 #include <libc.h> 3 #include <authsrv.h> 4 5 static long finddosfile(int, char*); 6 7 static int 8 check(void *x, int len, uchar sum, char *msg) 9 { 10 if(nvcsum(x, len) == sum) 11 return 0; 12 memset(x, 0, len); 13 fprint(2, "%s\n", msg); 14 return 1; 15 } 16 17 /* 18 * get key info out of nvram. since there isn't room in the PC's nvram use 19 * a disk partition there. 20 */ 21 static struct { 22 char *cputype; 23 char *file; 24 int off; 25 int len; 26 } nvtab[] = { 27 "sparc", "#r/nvram", 1024+850, sizeof(Nvrsafe), 28 "pc", "#S/sdC0/nvram", 0, sizeof(Nvrsafe), 29 "pc", "#S/sdC0/9fat", -1, sizeof(Nvrsafe), 30 "pc", "#S/sdC1/nvram", 0, sizeof(Nvrsafe), 31 "pc", "#S/sdC1/9fat", -1, sizeof(Nvrsafe), 32 "pc", "#S/sdD0/nvram", 0, sizeof(Nvrsafe), 33 "pc", "#S/sdD0/9fat", -1, sizeof(Nvrsafe), 34 "pc", "#S/sd00/nvram", 0, sizeof(Nvrsafe), 35 "pc", "#S/sd00/9fat", -1, sizeof(Nvrsafe), 36 "pc", "#S/sd01/nvram", 0, sizeof(Nvrsafe), 37 "pc", "#S/sd01/9fat", -1, sizeof(Nvrsafe), 38 "pc", "#f/fd0disk", -1, 512, /* 512: #f requires whole sector reads */ 39 "pc", "#f/fd1disk", -1, 512, 40 "mips", "#r/nvram", 1024+900, sizeof(Nvrsafe), 41 "power", "#F/flash/flash0", 0x440000, sizeof(Nvrsafe), 42 "power", "#r/nvram", 4352, sizeof(Nvrsafe), /* OK for MTX-604e */ 43 "power", "/nvram", 0, sizeof(Nvrsafe), /* OK for Ucu */ 44 "debug", "/tmp/nvram", 0, sizeof(Nvrsafe), 45 }; 46 47 static char* 48 readcons(char *prompt, char *def, int raw, char *buf, int nbuf) 49 { 50 int fdin, fdout, ctl, n, m; 51 char line[10]; 52 53 fdin = open("/dev/cons", OREAD); 54 if(fdin < 0) 55 fdin = 0; 56 fdout = open("/dev/cons", OWRITE); 57 if(fdout < 0) 58 fdout = 1; 59 if(def != nil) 60 fprint(fdout, "%s[%s]: ", prompt, def); 61 else 62 fprint(fdout, "%s: ", prompt); 63 if(raw){ 64 ctl = open("/dev/consctl", OWRITE); 65 if(ctl >= 0) 66 write(ctl, "rawon", 5); 67 } else 68 ctl = -1; 69 70 m = 0; 71 for(;;){ 72 n = read(fdin, line, 1); 73 if(n == 0){ 74 close(ctl); 75 werrstr("readcons: EOF"); 76 return nil; 77 } 78 if(n < 0){ 79 close(ctl); 80 werrstr("can't read cons"); 81 return nil; 82 } 83 if(line[0] == 0x7f) 84 exits(0); 85 if(n == 0 || line[0] == '\n' || line[0] == '\r'){ 86 if(raw){ 87 write(ctl, "rawoff", 6); 88 write(fdout, "\n", 1); 89 close(ctl); 90 } 91 buf[m] = '\0'; 92 if(buf[0]=='\0' && def) 93 strcpy(buf, def); 94 return buf; 95 } 96 if(line[0] == '\b'){ 97 if(m > 0) 98 m--; 99 }else if(line[0] == 0x15){ /* ^U: line kill */ 100 m = 0; 101 if(def != nil) 102 fprint(fdout, "%s[%s]: ", prompt, def); 103 else 104 fprint(fdout, "%s: ", prompt); 105 }else{ 106 if(m >= nbuf-1){ 107 fprint(fdout, "line too long\n"); 108 m = 0; 109 if(def != nil) 110 fprint(fdout, "%s[%s]: ", prompt, def); 111 else 112 fprint(fdout, "%s: ", prompt); 113 }else 114 buf[m++] = line[0]; 115 } 116 } 117 } 118 119 120 /* 121 * get key info out of nvram. since there isn't room in the PC's nvram use 122 * a disk partition there. 123 */ 124 int 125 readnvram(Nvrsafe *safep, int flag) 126 { 127 char buf[1024], in[128], *cputype, *nvrfile, *nvrlen, *nvroff, *v[2]; 128 int fd, err, i, safeoff, safelen; 129 Nvrsafe *safe; 130 131 err = 0; 132 memset(safep, 0, sizeof(*safep)); 133 134 nvrfile = getenv("nvram"); 135 cputype = getenv("cputype"); 136 if(cputype == nil) 137 cputype = "mips"; 138 if(strcmp(cputype, "386")==0 || strcmp(cputype, "alpha")==0) 139 cputype = "pc"; 140 141 safe = (Nvrsafe*)buf; 142 143 fd = -1; 144 safeoff = -1; 145 safelen = -1; 146 if(nvrfile != nil){ 147 /* accept device and device!file */ 148 i = gettokens(nvrfile, v, nelem(v), "!"); 149 fd = open(v[0], ORDWR); 150 safelen = sizeof(Nvrsafe); 151 if(strstr(v[0], "/9fat") == nil) 152 safeoff = 0; 153 nvrlen = getenv("nvrlen"); 154 if(nvrlen != nil) 155 safelen = atoi(nvrlen); 156 nvroff = getenv("nvroff"); 157 if(nvroff != nil){ 158 if(strcmp(nvroff, "dos") == 0) 159 safeoff = -1; 160 else 161 safeoff = atoi(nvroff); 162 } 163 if(safeoff < 0 && fd >= 0){ 164 safelen = 512; 165 safeoff = finddosfile(fd, i == 2 ? v[1] : "plan9.nvr"); 166 if(safeoff < 0){ 167 close(fd); 168 fd = -1; 169 } 170 } 171 free(nvrfile); 172 if(nvrlen != nil) 173 free(nvrlen); 174 if(nvroff != nil) 175 free(nvroff); 176 }else{ 177 for(i=0; i<nelem(nvtab); i++){ 178 if(strcmp(cputype, nvtab[i].cputype) != 0) 179 continue; 180 if((fd = open(nvtab[i].file, ORDWR)) < 0) 181 continue; 182 safeoff = nvtab[i].off; 183 safelen = nvtab[i].len; 184 if(safeoff == -1){ 185 safeoff = finddosfile(fd, "plan9.nvr"); 186 if(safeoff < 0){ 187 close(fd); 188 fd = -1; 189 continue; 190 } 191 } 192 break; 193 } 194 } 195 196 if(fd < 0 197 || seek(fd, safeoff, 0) < 0 198 || read(fd, buf, safelen) != safelen){ 199 err = 1; 200 if(flag&(NVwrite|NVwriteonerr)) 201 fprint(2, "can't read nvram: %r\n"); 202 memset(safep, 0, sizeof(*safep)); 203 safe = safep; 204 }else{ 205 *safep = *safe; 206 safe = safep; 207 208 err |= check(safe->machkey, DESKEYLEN, safe->machsum, "bad nvram key"); 209 // err |= check(safe->config, CONFIGLEN, safe->configsum, "bad secstore key"); 210 err |= check(safe->authid, ANAMELEN, safe->authidsum, "bad authentication id"); 211 err |= check(safe->authdom, DOMLEN, safe->authdomsum, "bad authentication domain"); 212 213 if(err == 0) 214 if(safe->authid[0]==0 || safe->authdom[0]==0){ 215 fprint(2, "empty nvram authid or authdom\n"); 216 err = 1; 217 } 218 } 219 220 if((flag&NVwrite) || (err && (flag&NVwriteonerr))){ 221 readcons("authid", nil, 0, safe->authid, sizeof(safe->authid)); 222 readcons("authdom", nil, 0, safe->authdom, sizeof(safe->authdom)); 223 readcons("secstore key", nil, 1, safe->config, sizeof(safe->config)); 224 for(;;){ 225 if(readcons("password", nil, 1, in, sizeof in) == nil) 226 goto Out; 227 if(passtokey(safe->machkey, in)) 228 break; 229 } 230 safe->machsum = nvcsum(safe->machkey, DESKEYLEN); 231 safe->configsum = nvcsum(safe->config, CONFIGLEN); 232 safe->authidsum = nvcsum(safe->authid, sizeof(safe->authid)); 233 safe->authdomsum = nvcsum(safe->authdom, sizeof(safe->authdom)); 234 *(Nvrsafe*)buf = *safe; 235 if(seek(fd, safeoff, 0) < 0 236 || write(fd, buf, safelen) != safelen){ 237 fprint(2, "can't write key to nvram: %r\n"); 238 err = 1; 239 }else 240 err = 0; 241 } 242 Out: 243 close(fd); 244 return err ? -1 : 0; 245 } 246 247 typedef struct Dosboot Dosboot; 248 struct Dosboot{ 249 uchar magic[3]; /* really an xx86 JMP instruction */ 250 uchar version[8]; 251 uchar sectsize[2]; 252 uchar clustsize; 253 uchar nresrv[2]; 254 uchar nfats; 255 uchar rootsize[2]; 256 uchar volsize[2]; 257 uchar mediadesc; 258 uchar fatsize[2]; 259 uchar trksize[2]; 260 uchar nheads[2]; 261 uchar nhidden[4]; 262 uchar bigvolsize[4]; 263 uchar driveno; 264 uchar reserved0; 265 uchar bootsig; 266 uchar volid[4]; 267 uchar label[11]; 268 uchar type[8]; 269 }; 270 #define GETSHORT(p) (((p)[1]<<8) | (p)[0]) 271 #define GETLONG(p) ((GETSHORT((p)+2) << 16) | GETSHORT((p))) 272 273 typedef struct Dosdir Dosdir; 274 struct Dosdir 275 { 276 char name[8]; 277 char ext[3]; 278 uchar attr; 279 uchar reserved[10]; 280 uchar time[2]; 281 uchar date[2]; 282 uchar start[2]; 283 uchar length[4]; 284 }; 285 286 static char* 287 dosparse(char *from, char *to, int len) 288 { 289 char c; 290 291 memset(to, ' ', len); 292 if(from == 0) 293 return 0; 294 while(len-- > 0){ 295 c = *from++; 296 if(c == '.') 297 return from; 298 if(c == 0) 299 break; 300 if(c >= 'a' && c <= 'z') 301 *to++ = c + 'A' - 'a'; 302 else 303 *to++ = c; 304 } 305 return 0; 306 } 307 308 /* 309 * return offset of first file block 310 * 311 * This is a very simplistic dos file system. It only 312 * works on floppies, only looks in the root, and only 313 * returns a pointer to the first block of a file. 314 * 315 * This exists for cpu servers that have no hard disk 316 * or nvram to store the key on. 317 * 318 * Please don't make this any smarter: it stays resident 319 * and I'ld prefer not to waste the space on something that 320 * runs only at boottime -- presotto. 321 */ 322 static long 323 finddosfile(int fd, char *file) 324 { 325 uchar secbuf[512]; 326 char name[8]; 327 char ext[3]; 328 Dosboot *b; 329 Dosdir *root, *dp; 330 int nroot, sectsize, rootoff, rootsects, n; 331 332 /* dos'ize file name */ 333 file = dosparse(file, name, 8); 334 dosparse(file, ext, 3); 335 336 /* read boot block, check for sanity */ 337 b = (Dosboot*)secbuf; 338 if(read(fd, secbuf, sizeof(secbuf)) != sizeof(secbuf)) 339 return -1; 340 if(b->magic[0] != 0xEB || b->magic[1] != 0x3C || b->magic[2] != 0x90) 341 return -1; 342 sectsize = GETSHORT(b->sectsize); 343 if(sectsize != 512) 344 return -1; 345 rootoff = (GETSHORT(b->nresrv) + b->nfats*GETSHORT(b->fatsize)) * sectsize; 346 if(seek(fd, rootoff, 0) < 0) 347 return -1; 348 nroot = GETSHORT(b->rootsize); 349 rootsects = (nroot*sizeof(Dosdir)+sectsize-1)/sectsize; 350 if(rootsects <= 0 || rootsects > 64) 351 return -1; 352 353 /* 354 * read root. it is contiguous to make stuff like 355 * this easier 356 */ 357 root = malloc(rootsects*sectsize); 358 if(read(fd, root, rootsects*sectsize) != rootsects*sectsize) 359 return -1; 360 n = -1; 361 for(dp = root; dp < &root[nroot]; dp++) 362 if(memcmp(name, dp->name, 8) == 0 && memcmp(ext, dp->ext, 3) == 0){ 363 n = GETSHORT(dp->start); 364 break; 365 } 366 free(root); 367 368 if(n < 0) 369 return -1; 370 371 /* 372 * dp->start is in cluster units, not sectors. The first 373 * cluster is cluster 2 which starts immediately after the 374 * root directory 375 */ 376 return rootoff + rootsects*sectsize + (n-2)*sectsize*b->clustsize; 377 } 378 379