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nix-daemon: Get peer credentials on Mac OS X

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This makes allowed-users and trusted-users work on Mac OS X.
This commit is contained in:
Eelco Dolstra 2014-10-31 10:08:59 +01:00
parent e389f4ea55
commit 526811c87a
1 changed files with 52 additions and 19 deletions
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71
src/nix-daemon/nix-daemon.cc
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@ -22,6 +22,10 @@
#include <pwd.h> #include <pwd.h>
#include <grp.h> #include <grp.h>
#if __APPLE__ || __FreeBSD__
#include <sys/ucred.h>
#endif
using namespace nix; using namespace nix;
@ -649,6 +653,44 @@ bool matchUser(const string & user, const string & group, const Strings & users)
} }
struct PeerInfo
{
bool pidKnown;
pid_t pid;
bool uidKnown;
uid_t uid;
bool gidKnown;
gid_t gid;
};
/* Get the identity of the caller, if possible. */
static PeerInfo getPeerInfo(int remote)
{
PeerInfo peer = { false, 0, false, 0, false, 0 };
#if defined(SO_PEERCRED)
ucred cred;
socklen_t credLen = sizeof(cred);
if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) == -1)
throw SysError("getting peer credentials");
peer = { true, cred.pid, true, cred.uid, true, cred.gid };
#elif defined(LOCAL_PEERCRED)
xucred cred;
socklen_t credLen = sizeof(cred);
if (getsockopt(remote, SOL_LOCAL, LOCAL_PEERCRED, &cred, &credLen) == -1)
throw SysError("getting peer credentials");
peer = { false, 0, true, cred.cr_uid, false, 0 };
#endif
return peer;
}
#define SD_LISTEN_FDS_START 3 #define SD_LISTEN_FDS_START 3
@ -735,22 +777,13 @@ static void daemonLoop(char * * argv)
closeOnExec(remote); closeOnExec(remote);
bool trusted = false; bool trusted = false;
pid_t clientPid = -1; PeerInfo peer = getPeerInfo(remote);
#if defined(SO_PEERCRED) struct passwd * pw = peer.uidKnown ? getpwuid(peer.uid) : 0;
/* Get the identity of the caller, if possible. */ string user = pw ? pw->pw_name : int2String(peer.uid);
ucred cred;
socklen_t credLen = sizeof(cred);
if (getsockopt(remote, SOL_SOCKET, SO_PEERCRED, &cred, &credLen) == -1)
throw SysError("getting peer credentials");
clientPid = cred.pid; struct group * gr = peer.gidKnown ? getgrgid(peer.gid) : 0;
string group = gr ? gr->gr_name : int2String(peer.gid);
struct passwd * pw = getpwuid(cred.uid);
string user = pw ? pw->pw_name : int2String(cred.uid);
struct group * gr = getgrgid(cred.gid);
string group = gr ? gr->gr_name : int2String(cred.gid);
Strings trustedUsers = settings.get("trusted-users", Strings({"root"})); Strings trustedUsers = settings.get("trusted-users", Strings({"root"}));
Strings allowedUsers = settings.get("allowed-users", Strings({"*"})); Strings allowedUsers = settings.get("allowed-users", Strings({"*"}));
@ -761,9 +794,9 @@ static void daemonLoop(char * * argv)
if (!trusted && !matchUser(user, group, allowedUsers)) if (!trusted && !matchUser(user, group, allowedUsers))
throw Error(format("user ‘%1%’ is not allowed to connect to the Nix daemon") % user); throw Error(format("user ‘%1%’ is not allowed to connect to the Nix daemon") % user);
printMsg(lvlInfo, format((string) "accepted connection from pid %1%, user %2%" printMsg(lvlInfo, format((string) "accepted connection from pid %1%, user %2%" + (trusted ? " (trusted)" : ""))
+ (trusted ? " (trusted)" : "")) % clientPid % user); % (peer.pidKnown ? int2String(peer.pid) : "<unknown>")
#endif % (peer.uidKnown ? user : "<unknown>"));
/* Fork a child to handle the connection. */ /* Fork a child to handle the connection. */
startProcess([&]() { startProcess([&]() {
@ -777,8 +810,8 @@ static void daemonLoop(char * * argv)
setSigChldAction(false); setSigChldAction(false);
/* For debugging, stuff the pid into argv[1]. */ /* For debugging, stuff the pid into argv[1]. */
if (clientPid != -1 && argv[1]) { if (peer.pidKnown && argv[1]) {
string processName = int2String(clientPid); string processName = int2String(peer.pid);
strncpy(argv[1], processName.c_str(), strlen(argv[1])); strncpy(argv[1], processName.c_str(), strlen(argv[1]));
} }