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dom0/qrexec: implement default user handling in qrexec_daemon

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This will simplify using qrexec from utilities which doen't load qubes.xml
normally (like qrexec_policy, gui daemon).
This commit is contained in:
Marek Marczykowski 2012-08-30 17:44:52 +02:00
parent 4e2f47d95c
commit 46fd664ba3
2 changed files with 19 additions and 4 deletions
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2
dom0/qvm-core/qubes.py
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@ -1441,7 +1441,7 @@ class QubesVm(object):
if verbose:
print >> sys.stderr, "--> Starting the qrexec daemon..."
xid = self.get_xid()
retcode = subprocess.call ([qrexec_daemon_path, str(xid)])
retcode = subprocess.call ([qrexec_daemon_path, str(xid), self.default_user])
if (retcode != 0) :
self.force_shutdown()
raise OSError ("ERROR: Cannot execute qrexec_daemon!")

21
qrexec/qrexec_daemon.c
View File

@ -59,6 +59,9 @@ struct _client clients[MAX_CLIENTS]; // data on all qrexec_client connections
int max_client_fd = -1; // current max fd of all clients; so that we need not to scan all the "clients" table
int qrexec_daemon_unix_socket_fd; // /var/run/qubes/qrexec.xid descriptor
char *default_user = "user";
char default_user_keyword[] = "DEFAULT:";
#define default_user_keyword_len_without_colon (sizeof(default_user_keyword)-2)
void sigusr1_handler(int x)
{
@ -193,12 +196,22 @@ int get_cmdline_body_from_client_and_pass_to_agent(int fd, struct server_header
{
int len = s_hdr->len;
char buf[len];
int use_default_user = 0;
if (!read_all(fd, buf, len)) {
terminate_client_and_flush_data(fd);
return 0;
}
if (!strncmp(buf, default_user_keyword, default_user_keyword_len_without_colon+1)) {
use_default_user = 1;
s_hdr->len -= default_user_keyword_len_without_colon; // -1 because of colon
s_hdr->len += strlen(default_user);
}
write_all_vchan_ext(s_hdr, sizeof(*s_hdr));
write_all_vchan_ext(buf, len);
if (use_default_user) {
write_all_vchan_ext(default_user, strlen(default_user));
write_all_vchan_ext(buf+default_user_keyword_len_without_colon, len-default_user_keyword_len_without_colon);
} else
write_all_vchan_ext(buf, len);
return 1;
}
@ -580,10 +593,12 @@ int main(int argc, char **argv)
int max;
sigset_t chld_set;
if (argc != 2) {
fprintf(stderr, "usage: %s domainid\n", argv[0]);
if (argc != 2 && argc != 3) {
fprintf(stderr, "usage: %s domainid [default user]\n", argv[0]);
exit(1);
}
if (argc == 3)
default_user = argv[2];
init(atoi(argv[1]));
sigemptyset(&chld_set);
sigaddset(&chld_set, SIGCHLD);