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vm: support for magic QUBESRPC command

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Previously dom0 had to know full path of qubes_rpc_multiplexer in VM, which can
differ between VMs (eg totally different on Windows). This commit enables dom0
to magic keyword instead of full path.
This commit is contained in:
Marek Marczykowski 2012-06-22 21:17:50 +02:00
parent 36f6a2c42c
commit 28ca836e14
2 changed files with 16 additions and 4 deletions
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3
qrexec/qrexec.h
View File

@ -30,6 +30,9 @@
#define QREXEC_AGENT_TRIGGER_PATH "/var/run/qubes/qrexec_agent"
#define QREXEC_AGENT_FDPASS_PATH "/var/run/qubes/qrexec_agent_fdpass"
#define MEMINFO_WRITER_PIDFILE "/var/run/meminfo-writer.pid"
#define QUBES_RPC_MULTIPLEXER_PATH "/usr/lib/qubes/qubes_rpc_multiplexer"
#define QUBES_RPC_MAGIC_CMD "QUBESRPC"
enum {
/* messages from qrexec_client to qrexec_daemon (both in dom0) */

17
qrexec/qrexec_agent.c
View File

@ -115,14 +115,23 @@ void no_colon_in_cmd()
void do_exec(char *cmd)
{
char *sep = index(cmd, ':');
if (!sep)
char buf[strlen(QUBES_RPC_MULTIPLEXER_PATH) + strlen(cmd) - strlen(QUBES_RPC_MAGIC_CMD) + 1];
char *realcmd = index(cmd, ':');
if (!realcmd)
no_colon_in_cmd();
*sep = 0;
/* mark end of username and move to command */
*realcmd = 0;
realcmd++;
/* replace magic RPC cmd with RPC multiplexer path */
if (strncmp(realcmd, QUBES_RPC_MAGIC_CMD " ", strlen(QUBES_RPC_MAGIC_CMD)+1)==0) {
strcpy(buf, QUBES_RPC_MULTIPLEXER_PATH);
strcpy(buf + strlen(QUBES_RPC_MULTIPLEXER_PATH), realcmd + strlen(QUBES_RPC_MAGIC_CMD));
realcmd = buf;
}
signal(SIGCHLD, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
execl("/bin/su", "su", "-", cmd, "-c", sep + 1, NULL);
execl("/bin/su", "su", "-", cmd, "-c", realcmd, NULL);
perror("execl");
exit(1);
}