ref: 3b7e03a30ed29ee0666c00568bf67b8179c28d12
dir: /sys/src/cmd/import.c/
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <libsec.h>
enum {
Encnone,
Encssl,
Enctls,
};
static char *encprotos[] = {
[Encnone] = "clear",
[Encssl] = "ssl",
[Enctls] = "tls",
nil,
};
char *keyspec = "";
char *filterp;
char *ealgs = "rc4_256 sha1";
int encproto = Encnone;
char *aan = "/bin/aan";
char *anstring = "tcp!*!0";
AuthInfo *ai;
int debug;
int doauth = 1;
int timedout;
int skiptree;
int connect(char*, char*);
int passive(void);
void catcher(void*, char*);
void sysfatal(char*, ...);
void usage(void);
int filter(int, char *, char *);
static void mksecret(char *, uchar *);
/*
* based on libthread's threadsetname, but drags in less library code.
* actually just sets the arguments displayed.
*/
void
procsetname(char *fmt, ...)
{
int fd;
char *cmdname;
char buf[128];
va_list arg;
va_start(arg, fmt);
cmdname = vsmprint(fmt, arg);
va_end(arg);
if (cmdname == nil)
return;
snprint(buf, sizeof buf, "#p/%d/args", getpid());
if((fd = open(buf, OWRITE)) >= 0){
write(fd, cmdname, strlen(cmdname)+1);
close(fd);
}
free(cmdname);
}
void
post(char *name, char *envname, int srvfd)
{
int fd;
char buf[32];
fd = create(name, OWRITE, 0600);
if(fd < 0)
return;
snprint(buf, sizeof(buf), "%d", srvfd);
if(write(fd, buf, strlen(buf)) != strlen(buf))
sysfatal("srv write: %r");
close(fd);
putenv(envname, name);
}
static int
lookup(char *s, char *l[])
{
int i;
for (i = 0; l[i] != 0; i++)
if (strcmp(l[i], s) == 0)
return i;
return -1;
}
void
main(int argc, char **argv)
{
char *mntpt, *srvpost, srvfile[64];
int backwards = 0, fd, mntflags;
quotefmtinstall();
srvpost = nil;
mntflags = MREPL;
ARGBEGIN{
case 'A':
doauth = 0;
break;
case 'a':
mntflags = MAFTER;
break;
case 'b':
mntflags = MBEFORE;
break;
case 'c':
mntflags |= MCREATE;
break;
case 'C':
mntflags |= MCACHE;
break;
case 'd':
debug++;
break;
case 'f':
/* ignored but allowed for compatibility */
break;
case 'E':
if ((encproto = lookup(EARGF(usage()), encprotos)) < 0)
usage();
break;
case 'e':
ealgs = EARGF(usage());
if(*ealgs == 0 || strcmp(ealgs, "clear") == 0)
ealgs = nil;
break;
case 'k':
keyspec = EARGF(usage());
break;
case 'p':
filterp = aan;
break;
case 'n':
anstring = EARGF(usage());
break;
case 's':
srvpost = EARGF(usage());
break;
case 'B':
backwards = 1;
break;
case 'z':
skiptree = 1;
break;
default:
usage();
}ARGEND;
mntpt = 0; /* to shut up compiler */
if(backwards){
switch(argc) {
default:
mntpt = argv[0];
break;
case 0:
usage();
}
} else {
switch(argc) {
case 2:
mntpt = argv[1];
break;
case 3:
mntpt = argv[2];
break;
default:
usage();
}
}
if (encproto == Enctls)
sysfatal("%s: tls has not yet been implemented", argv[0]);
notify(catcher);
alarm(60*1000);
if (backwards)
fd = passive();
else
fd = connect(argv[0], argv[1]);
fprint(fd, "impo %s %s\n", filterp? "aan": "nofilter", encprotos[encproto]);
if (encproto != Encnone && ealgs && ai) {
uchar key[16], digest[SHA1dlen];
char fromclientsecret[21];
char fromserversecret[21];
int i;
if(ai->nsecret < 8)
sysfatal("secret too small to ssl");
memmove(key+4, ai->secret, 8);
/* exchange random numbers */
srand(truerand());
for(i = 0; i < 4; i++)
key[i] = rand();
if(write(fd, key, 4) != 4)
sysfatal("can't write key part: %r");
if(readn(fd, key+12, 4) != 4)
sysfatal("can't read key part: %r");
/* scramble into two secrets */
sha1(key, sizeof(key), digest, nil);
mksecret(fromclientsecret, digest);
mksecret(fromserversecret, digest+10);
if (filterp)
fd = filter(fd, filterp, backwards ? nil : argv[0]);
/* set up encryption */
procsetname("pushssl");
fd = pushssl(fd, ealgs, fromclientsecret, fromserversecret, nil);
if(fd < 0)
sysfatal("can't establish ssl connection: %r");
}
else if (filterp)
fd = filter(fd, filterp, backwards ? nil : argv[0]);
if(ai)
auth_freeAI(ai);
if(srvpost){
snprint(srvfile, sizeof(srvfile), "/srv/%s", srvpost);
remove(srvfile);
post(srvfile, srvpost, fd);
}
procsetname("mount on %s", mntpt);
if(mount(fd, -1, mntpt, mntflags, "") < 0)
sysfatal("can't mount %s: %r", argv[1]);
alarm(0);
if(backwards && argc > 1){
exec(argv[1], &argv[1]);
sysfatal("exec: %r");
}
exits(0);
}
void
catcher(void*, char *msg)
{
timedout = 1;
if(strcmp(msg, "alarm") == 0)
noted(NCONT);
noted(NDFLT);
}
int
connect(char *system, char *tree)
{
char buf[ERRMAX], dir[128], *na;
int fd, n;
na = netmkaddr(system, 0, "exportfs");
procsetname("dial %s", na);
if((fd = dial(na, 0, dir, 0)) < 0)
sysfatal("can't dial %s: %r", system);
if(doauth){
procsetname("auth_proxy auth_getkey proto=p9any role=client %s", keyspec);
ai = auth_proxy(fd, auth_getkey, "proto=p9any role=client %s", keyspec);
if(ai == nil)
sysfatal("%r: %s", system);
}
if(!skiptree){
procsetname("writing tree name %s", tree);
n = write(fd, tree, strlen(tree));
if(n < 0)
sysfatal("can't write tree: %r");
strcpy(buf, "can't read tree");
procsetname("awaiting OK for %s", tree);
n = read(fd, buf, sizeof buf - 1);
if(n!=2 || buf[0]!='O' || buf[1]!='K'){
if (timedout)
sysfatal("timed out connecting to %s", na);
buf[sizeof buf - 1] = '\0';
sysfatal("bad remote tree: %s", buf);
}
}
return fd;
}
int
passive(void)
{
int fd;
/*
* Ignore doauth==0 on purpose. Is it useful here?
*/
procsetname("auth_proxy auth_getkey proto=p9any role=server");
ai = auth_proxy(0, auth_getkey, "proto=p9any role=server");
if(ai == nil)
sysfatal("auth_proxy: %r");
if(auth_chuid(ai, nil) < 0)
sysfatal("auth_chuid: %r");
putenv("service", "import");
fd = dup(0, -1);
close(0);
open("/dev/null", ORDWR);
close(1);
open("/dev/null", ORDWR);
return fd;
}
void
usage(void)
{
fprint(2, "usage: import [-abcC] [-A] [-E clear|ssl|tls] "
"[-e 'crypt auth'|clear] [-k keypattern] [-p] [-n address ] [-z] host remotefs [mountpoint]\n");
exits("usage");
}
int
filter(int fd, char *cmd, char *host)
{
char addr[128], buf[256], *s, *file, *argv[16];
int lfd, p[2], len, argc;
if(host == nil){
/* Get a free port and post it to the client. */
if (announce(anstring, addr) < 0)
sysfatal("filter: Cannot announce %s: %r", anstring);
snprint(buf, sizeof(buf), "%s/local", addr);
if ((lfd = open(buf, OREAD)) < 0)
sysfatal("filter: Cannot open %s: %r", buf);
if ((len = read(lfd, buf, sizeof buf - 1)) < 0)
sysfatal("filter: Cannot read %s: %r", buf);
close(lfd);
buf[len] = '\0';
if ((s = strchr(buf, '\n')) != nil)
len = s - buf;
if (write(fd, buf, len) != len)
sysfatal("filter: cannot write port; %r");
} else {
/* Read address string from connection */
if ((len = read(fd, buf, sizeof buf - 1)) < 0)
sysfatal("filter: cannot write port; %r");
buf[len] = '\0';
if ((s = strrchr(buf, '!')) == nil)
sysfatal("filter: illegally formatted port %s", buf);
strecpy(addr, addr+sizeof(addr), netmkaddr(host, "tcp", s+1));
strecpy(strrchr(addr, '!'), addr+sizeof(addr), s);
}
if(debug)
fprint(2, "filter: %s\n", addr);
snprint(buf, sizeof(buf), "%s", cmd);
argc = tokenize(buf, argv, nelem(argv)-3);
if (argc == 0)
sysfatal("filter: empty command");
if(host != nil)
argv[argc++] = "-c";
argv[argc++] = addr;
argv[argc] = nil;
file = argv[0];
if((s = strrchr(argv[0], '/')) != nil)
argv[0] = s+1;
if(pipe(p) < 0)
sysfatal("pipe: %r");
switch(rfork(RFNOWAIT|RFPROC|RFMEM|RFFDG|RFREND)) {
case -1:
sysfatal("filter: rfork; %r\n");
case 0:
close(fd);
if (dup(p[0], 1) < 0)
sysfatal("filter: Cannot dup to 1; %r");
if (dup(p[0], 0) < 0)
sysfatal("filter: Cannot dup to 0; %r");
close(p[0]);
close(p[1]);
exec(file, argv);
sysfatal("filter: exec; %r");
default:
dup(p[1], fd);
close(p[0]);
close(p[1]);
}
return fd;
}
static void
mksecret(char *t, uchar *f)
{
sprint(t, "%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux",
f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], f[9]);
}