mirror of https://github.com/0intro/conterm
369 lines
8.2 KiB
C
369 lines
8.2 KiB
C
#include <u.h>
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#include <libc.h>
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#include <authsrv.h>
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static long finddosfile(int, char*);
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static int
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check(void *x, int len, uchar sum, char *msg)
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{
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if(nvcsum(x, len) == sum)
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return 0;
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memset(x, 0, len);
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fprint(2, "%s\n", msg);
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return 1;
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}
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/*
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* get key info out of nvram. since there isn't room in the PC's nvram use
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* a disk partition there.
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*/
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static struct {
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char *cputype;
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char *file;
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int off;
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int len;
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} nvtab[] = {
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"sparc", "#r/nvram", 1024+850, sizeof(Nvrsafe),
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"pc", "#S/sdC0/nvram", 0, sizeof(Nvrsafe),
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"pc", "#S/sdC0/9fat", -1, sizeof(Nvrsafe),
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"pc", "#S/sd00/nvram", 0, sizeof(Nvrsafe),
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"pc", "#S/sd00/9fat", -1, sizeof(Nvrsafe),
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"pc", "#S/sd01/nvram", 0, sizeof(Nvrsafe),
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"pc", "#S/sd01/9fat", -1, sizeof(Nvrsafe),
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"pc", "#f/fd0disk", -1, 512, /* 512: #f requires whole sector reads */
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"pc", "#f/fd1disk", -1, 512,
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"mips", "#r/nvram", 1024+900, sizeof(Nvrsafe),
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"power", "#F/flash/flash0", 0x300000, sizeof(Nvrsafe),
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"power", "#r/nvram", 4352, sizeof(Nvrsafe), /* OK for MTX-604e */
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"debug", "/tmp/nvram", 0, sizeof(Nvrsafe),
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};
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static char*
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readcons(char *prompt, char *def, int raw, char *buf, int nbuf)
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{
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int fdin, fdout, ctl, n, m;
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char line[10];
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fdin = open("/dev/cons", OREAD);
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if(fdin < 0)
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fdin = 0;
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fdout = open("/dev/cons", OWRITE);
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if(fdout < 0)
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fdout = 1;
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if(def != nil)
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fprint(fdout, "%s[%s]: ", prompt, def);
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else
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fprint(fdout, "%s: ", prompt);
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if(raw){
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ctl = open("/dev/consctl", OWRITE);
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if(ctl >= 0)
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write(ctl, "rawon", 5);
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} else
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ctl = -1;
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m = 0;
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for(;;){
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n = read(fdin, line, 1);
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if(n == 0){
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close(ctl);
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werrstr("readcons: EOF");
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return nil;
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}
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if(n < 0){
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close(ctl);
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werrstr("can't read cons");
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return nil;
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}
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if(line[0] == 0x7f)
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exits(0);
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if(n == 0 || line[0] == '\n' || line[0] == '\r'){
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if(raw){
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write(ctl, "rawoff", 6);
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write(fdout, "\n", 1);
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close(ctl);
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}
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buf[m] = '\0';
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if(buf[0]=='\0' && def)
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strcpy(buf, def);
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return buf;
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}
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if(line[0] == '\b'){
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if(m > 0)
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m--;
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}else if(line[0] == 0x15){ /* ^U: line kill */
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m = 0;
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if(def != nil)
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fprint(fdout, "%s[%s]: ", prompt, def);
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else
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fprint(fdout, "%s: ", prompt);
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}else{
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if(m >= nbuf-1){
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fprint(fdout, "line too long\n");
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m = 0;
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if(def != nil)
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fprint(fdout, "%s[%s]: ", prompt, def);
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else
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fprint(fdout, "%s: ", prompt);
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}else
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buf[m++] = line[0];
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}
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}
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return buf; /* how does this happen */
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}
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/*
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* get key info out of nvram. since there isn't room in the PC's nvram use
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* a disk partition there.
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*/
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int
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readnvram(Nvrsafe *safep, int flag)
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{
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char buf[1024], in[128], *cputype, *nvrfile, *nvrlen, *nvroff, *v[2];
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int fd, err, i, safeoff, safelen;
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Nvrsafe *safe;
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err = 0;
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memset(safep, 0, sizeof(*safep));
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nvrfile = getenv("nvram");
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cputype = getenv("cputype");
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if(cputype == nil)
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cputype = "mips";
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if(strcmp(cputype, "386")==0 || strcmp(cputype, "alpha")==0)
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cputype = "pc";
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safe = (Nvrsafe*)buf;
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fd = -1;
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safeoff = -1;
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safelen = -1;
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if(nvrfile != nil){
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/* accept device and device!file */
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i = gettokens(nvrfile, v, nelem(v), "!");
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fd = open(v[0], ORDWR);
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safelen = sizeof(Nvrsafe);
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if(strstr(v[0], "/9fat") == nil)
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safeoff = 0;
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nvrlen = getenv("nvrlen");
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if(nvrlen != nil)
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safelen = atoi(nvrlen);
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nvroff = getenv("nvroff");
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if(nvroff != nil){
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if(strcmp(nvroff, "dos") == 0)
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safeoff = -1;
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else
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safeoff = atoi(nvroff);
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}
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if(safeoff < 0 && fd >= 0){
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safelen = 512;
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safeoff = finddosfile(fd, i == 2 ? v[1] : "plan9.nvr");
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if(safeoff < 0){
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close(fd);
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fd = -1;
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}
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}
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free(nvrfile);
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if(nvrlen != nil)
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free(nvrlen);
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if(nvroff != nil)
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free(nvroff);
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}else{
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for(i=0; i<nelem(nvtab); i++){
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if(strcmp(cputype, nvtab[i].cputype) != 0)
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continue;
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if((fd = open(nvtab[i].file, ORDWR)) < 0)
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continue;
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safeoff = nvtab[i].off;
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safelen = nvtab[i].len;
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if(safeoff == -1){
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safeoff = finddosfile(fd, "plan9.nvr");
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if(safeoff < 0){
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close(fd);
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fd = -1;
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continue;
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}
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}
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break;
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}
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}
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if(fd < 0
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|| seek(fd, safeoff, 0) < 0
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|| read(fd, buf, safelen) != safelen){
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err = 1;
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if(flag&(NVwrite|NVwriteonerr))
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fprint(2, "can't read nvram: %r\n");
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memset(safep, 0, sizeof(*safep));
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safe = safep;
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}else{
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*safep = *safe;
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safe = safep;
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err |= check(safe->machkey, DESKEYLEN, safe->machsum, "bad nvram key");
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// err |= check(safe->config, CONFIGLEN, safe->configsum, "bad secstore key");
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err |= check(safe->authid, ANAMELEN, safe->authidsum, "bad authentication id");
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err |= check(safe->authdom, DOMLEN, safe->authdomsum, "bad authentication domain");
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}
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if((flag&NVwrite) || (err && (flag&NVwriteonerr))){
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readcons("authid", nil, 0, safe->authid, sizeof(safe->authid));
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readcons("authdom", nil, 0, safe->authdom, sizeof(safe->authdom));
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readcons("secstore key", nil, 1, safe->config, sizeof(safe->config));
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for(;;){
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if(readcons("password", nil, 1, in, sizeof in) == nil)
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goto Out;
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if(passtokey(safe->machkey, in))
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break;
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}
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safe->machsum = nvcsum(safe->machkey, DESKEYLEN);
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safe->configsum = nvcsum(safe->config, CONFIGLEN);
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safe->authidsum = nvcsum(safe->authid, sizeof(safe->authid));
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safe->authdomsum = nvcsum(safe->authdom, sizeof(safe->authdom));
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*(Nvrsafe*)buf = *safe;
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if(seek(fd, safeoff, 0) < 0
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|| write(fd, buf, safelen) != safelen){
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fprint(2, "can't write key to nvram: %r\n");
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err = 1;
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}else
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err = 0;
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}
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Out:
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close(fd);
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return err ? -1 : 0;
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}
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typedef struct Dosboot Dosboot;
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struct Dosboot{
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uchar magic[3]; /* really an xx86 JMP instruction */
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uchar version[8];
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uchar sectsize[2];
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uchar clustsize;
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uchar nresrv[2];
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uchar nfats;
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uchar rootsize[2];
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uchar volsize[2];
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uchar mediadesc;
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uchar fatsize[2];
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uchar trksize[2];
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uchar nheads[2];
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uchar nhidden[4];
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uchar bigvolsize[4];
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uchar driveno;
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uchar reserved0;
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uchar bootsig;
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uchar volid[4];
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uchar label[11];
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uchar type[8];
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};
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#define GETSHORT(p) (((p)[1]<<8) | (p)[0])
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#define GETLONG(p) ((GETSHORT((p)+2) << 16) | GETSHORT((p)))
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typedef struct Dosdir Dosdir;
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struct Dosdir
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{
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char name[8];
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char ext[3];
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uchar attr;
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uchar reserved[10];
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uchar time[2];
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uchar date[2];
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uchar start[2];
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uchar length[4];
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};
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static char*
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dosparse(char *from, char *to, int len)
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{
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char c;
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memset(to, ' ', len);
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if(from == 0)
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return 0;
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while(len-- > 0){
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c = *from++;
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if(c == '.')
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return from;
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if(c == 0)
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break;
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if(c >= 'a' && c <= 'z')
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*to++ = c + 'A' - 'a';
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else
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*to++ = c;
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}
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return 0;
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}
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/*
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* return offset of first file block
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*
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* This is a very simplistic dos file system. It only
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* works on floppies, only looks in the root, and only
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* returns a pointer to the first block of a file.
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*
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* This exists for cpu servers that have no hard disk
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* or nvram to store the key on.
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*
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* Please don't make this any smarter: it stays resident
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* and I'ld prefer not to waste the space on something that
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* runs only at boottime -- presotto.
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*/
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static long
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finddosfile(int fd, char *file)
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{
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uchar secbuf[512];
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char name[8];
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char ext[3];
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Dosboot *b;
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Dosdir *root, *dp;
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int nroot, sectsize, rootoff, rootsects, n;
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/* dos'ize file name */
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file = dosparse(file, name, 8);
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dosparse(file, ext, 3);
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/* read boot block, check for sanity */
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b = (Dosboot*)secbuf;
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if(read(fd, secbuf, sizeof(secbuf)) != sizeof(secbuf))
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return -1;
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if(b->magic[0] != 0xEB || b->magic[1] != 0x3C || b->magic[2] != 0x90)
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return -1;
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sectsize = GETSHORT(b->sectsize);
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if(sectsize != 512)
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return -1;
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rootoff = (GETSHORT(b->nresrv) + b->nfats*GETSHORT(b->fatsize)) * sectsize;
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if(seek(fd, rootoff, 0) < 0)
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return -1;
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nroot = GETSHORT(b->rootsize);
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rootsects = (nroot*sizeof(Dosdir)+sectsize-1)/sectsize;
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if(rootsects <= 0 || rootsects > 64)
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return -1;
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/*
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* read root. it is contiguous to make stuff like
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* this easier
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*/
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root = malloc(rootsects*sectsize);
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if(read(fd, root, rootsects*sectsize) != rootsects*sectsize)
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return -1;
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n = -1;
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for(dp = root; dp < &root[nroot]; dp++)
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if(memcmp(name, dp->name, 8) == 0 && memcmp(ext, dp->ext, 3) == 0){
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n = GETSHORT(dp->start);
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break;
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}
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free(root);
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if(n < 0)
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return -1;
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/*
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* dp->start is in cluster units, not sectors. The first
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* cluster is cluster 2 which starts immediately after the
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* root directory
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*/
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return rootoff + rootsects*sectsize + (n-2)*sectsize*b->clustsize;
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}
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