upstream commit

move subprocess() so scp/sftp do not need uidswap.o; ok
djm@

OpenBSD-Commit-ID: 6601b8360388542c2e5fef0f4085f8e54750bea8

1 files changed, 1 insertions, 153 deletions

diff --git a/misc.c b/misc.c
index 50988cef..f6fbb5e4 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.c,v 1.122 2017/12/08 02:14:33 djm Exp $ */
+/* $OpenBSD: misc.c,v 1.123 2018/01/08 15:21:49 markus Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  * Copyright (c) 2005,2006 Damien Miller.  All rights reserved.
@@ -1740,158 +1740,6 @@ argv_assemble(int argc, char **argv)
 	return ret;
 }
 
-/*
- * Runs command in a subprocess wuth a minimal environment.
- * Returns pid on success, 0 on failure.
- * The child stdout and stderr maybe captured, left attached or sent to
- * /dev/null depending on the contents of flags.
- * "tag" is prepended to log messages.
- * NB. "command" is only used for logging; the actual command executed is
- * av[0].
- */
-pid_t
-subprocess(const char *tag, struct passwd *pw, const char *command,
-    int ac, char **av, FILE **child, u_int flags)
-{
-	FILE *f = NULL;
-	struct stat st;
-	int fd, devnull, p[2], i;
-	pid_t pid;
-	char *cp, errmsg[512];
-	u_int envsize;
-	char **child_env;
-
-	if (child != NULL)
-		*child = NULL;
-
-	debug3("%s: %s command \"%s\" running as %s (flags 0x%x)", __func__,
-	    tag, command, pw->pw_name, flags);
-
-	/* Check consistency */
-	if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
-	    (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) {
-		error("%s: inconsistent flags", __func__);
-		return 0;
-	}
-	if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) {
-		error("%s: inconsistent flags/output", __func__);
-		return 0;
-	}
-
-	/*
-	 * If executing an explicit binary, then verify the it exists
-	 * and appears safe-ish to execute
-	 */
-	if (*av[0] != '/') {
-		error("%s path is not absolute", tag);
-		return 0;
-	}
-	temporarily_use_uid(pw);
-	if (stat(av[0], &st) < 0) {
-		error("Could not stat %s \"%s\": %s", tag,
-		    av[0], strerror(errno));
-		restore_uid();
-		return 0;
-	}
-	if (safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) {
-		error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
-		restore_uid();
-		return 0;
-	}
-	/* Prepare to keep the child's stdout if requested */
-	if (pipe(p) != 0) {
-		error("%s: pipe: %s", tag, strerror(errno));
-		restore_uid();
-		return 0;
-	}
-	restore_uid();
-
-	switch ((pid = fork())) {
-	case -1: /* error */
-		error("%s: fork: %s", tag, strerror(errno));
-		close(p[0]);
-		close(p[1]);
-		return 0;
-	case 0: /* child */
-		/* Prepare a minimal environment for the child. */
-		envsize = 5;
-		child_env = xcalloc(sizeof(*child_env), envsize);
-		child_set_env(&child_env, &envsize, "PATH", _PATH_STDPATH);
-		child_set_env(&child_env, &envsize, "USER", pw->pw_name);
-		child_set_env(&child_env, &envsize, "LOGNAME", pw->pw_name);
-		child_set_env(&child_env, &envsize, "HOME", pw->pw_dir);
-		if ((cp = getenv("LANG")) != NULL)
-			child_set_env(&child_env, &envsize, "LANG", cp);
-
-		for (i = 0; i < NSIG; i++)
-			signal(i, SIG_DFL);
-
-		if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
-			error("%s: open %s: %s", tag, _PATH_DEVNULL,
-			    strerror(errno));
-			_exit(1);
-		}
-		if (dup2(devnull, STDIN_FILENO) == -1) {
-			error("%s: dup2: %s", tag, strerror(errno));
-			_exit(1);
-		}
-
-		/* Set up stdout as requested; leave stderr in place for now. */
-		fd = -1;
-		if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0)
-			fd = p[1];
-		else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0)
-			fd = devnull;
-		if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) {
-			error("%s: dup2: %s", tag, strerror(errno));
-			_exit(1);
-		}
-		closefrom(STDERR_FILENO + 1);
-
-		/* Don't use permanently_set_uid() here to avoid fatal() */
-		if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
-			error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
-			    strerror(errno));
-			_exit(1);
-		}
-		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) {
-			error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
-			    strerror(errno));
-			_exit(1);
-		}
-		/* stdin is pointed to /dev/null at this point */
-		if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
-		    dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
-			error("%s: dup2: %s", tag, strerror(errno));
-			_exit(1);
-		}
-
-		execve(av[0], av, child_env);
-		error("%s exec \"%s\": %s", tag, command, strerror(errno));
-		_exit(127);
-	default: /* parent */
-		break;
-	}
-
-	close(p[1]);
-	if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0)
-		close(p[0]);
-	else if ((f = fdopen(p[0], "r")) == NULL) {
-		error("%s: fdopen: %s", tag, strerror(errno));
-		close(p[0]);
-		/* Don't leave zombie child */
-		kill(pid, SIGTERM);
-		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
-			;
-		return 0;
-	}
-	/* Success */
-	debug3("%s: %s pid %ld", __func__, tag, (long)pid);
-	if (child != NULL)
-		*child = f;
-	return pid;
-}
-
 /* Returns 0 if pid exited cleanly, non-zero otherwise */
 int
 exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)