Adding debian version 2:2.6.1-4~deb12u2.debian/2%2.6.1-4_deb12u2debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 573 insertions, 0 deletions

diff --git a/debian/askpass.c b/debian/askpass.c
new file mode 100644
index 0000000..07826de
--- /dev/null
+++ b/debian/askpass.c
@@ -0,0 +1,573 @@
+/*
+ * askpass.c - prompts a user for a passphrase using any suitable method
+ *             and prints the result to stdout.
+ *
+ * Copyright (C) 2008   David Härdeman <david@hardeman.nu>
+ *
+ * This package is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This package is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this package; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+
+#define _GNU_SOURCE
+#define _DEFAULT_SOURCE
+#define _POSIX_C_SOURCE 1
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+#include <termios.h>
+#include <sys/klog.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <signal.h>
+#include <sys/un.h>
+
+#define DEBUG 0
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
+static bool disable_method(const char *method);
+
+/*****************************************************************************
+ * Utility functions                                                         *
+ *****************************************************************************/
+static void
+debug(const char *fmt, ...)
+{
+	va_list ap;
+	static bool first = true;
+	static FILE *dbgfile;
+
+	if (!DEBUG)
+		return;
+
+	if (first) {
+		first = false;
+		dbgfile = fopen("/tmp/askpass.debug", "a");
+	}
+
+	if (!dbgfile)
+		return;
+
+	va_start(ap, fmt);
+	vfprintf(dbgfile, fmt, ap);
+	va_end(ap);
+}
+
+static void
+usage(const char *arg0, const char *errmsg)
+{
+	if (errmsg)
+		fprintf(stderr, "Error: %s\nUsage: %s PROMPT\n", errmsg, arg0);
+	else
+		fprintf(stderr, "Usage: %s PROMPT\n", arg0);
+	exit(EXIT_FAILURE);
+}
+
+static void
+fifo_common_finish(int fd, char **buf, size_t *used, size_t *size)
+{
+	if (fd >= 0)
+		close(fd);
+
+	if (!*buf)
+		return;
+
+	memset(*buf, '\0', *size);
+	free(*buf);
+	*buf = NULL;
+	*used = 0;
+	*size = 0;
+}
+
+static bool
+fifo_common_read(int fd, char **buf, size_t *used, size_t *size)
+{
+	ssize_t result;
+
+again:
+	if ((*size - *used) == 0) {
+		*size += 4096;
+		*buf = realloc(*buf, *size);
+		if (!*buf) {
+			*size = 0;
+			*used = 0;
+			debug("Failed to allocate memory for passphrase\n");
+			return false;
+		}
+	}
+
+reread:
+	result = read(fd, *buf + *used, *size - *used);
+
+	if (result < 0) {
+		if (errno == EAGAIN)
+			return false;
+		if (errno == EINTR)
+			goto reread;
+		debug("Error when reading from fifo\n");
+		return false;
+	}
+
+	debug("Read %i bytes from fifo\n", (int)result);
+	*used += result;
+
+	if (result == 0)
+		return true;
+
+	goto again;
+}
+
+/*****************************************************************************
+ * systemd functions                                                         *
+ *****************************************************************************/
+
+#define SYSTEMD_ASKPASS "/bin/systemd-ask-password"
+static pid_t systemdpid;
+static size_t systemdused = 0;
+static size_t systemdsize = 0;
+static char *systemdbuf = NULL;
+
+static int
+systemd_prepare(const char *prompt)
+{
+	struct stat a, b;
+	int pipefds[2];
+
+	/* is systemd running? */
+	if (lstat("/sys/fs/cgroup", &a) < 0)
+		return -1;
+	if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
+		return -1;
+	if (a.st_dev == b.st_dev)
+		return -1;
+
+	if (access(SYSTEMD_ASKPASS, X_OK))
+		return -1;
+
+	if (pipe(pipefds))
+		return -1;
+
+	systemdpid = fork();
+	if (systemdpid < 0) {
+		close(pipefds[0]);
+		close(pipefds[1]);
+		return -1;
+	}
+
+	if (systemdpid == 0) {
+		close(pipefds[0]);
+		if (dup2(pipefds[1], STDOUT_FILENO) < 0)
+			exit(EXIT_FAILURE);
+		execl(SYSTEMD_ASKPASS, SYSTEMD_ASKPASS,
+		      "--timeout=0", prompt, (char*)NULL);
+		exit(EXIT_FAILURE);
+	}
+
+	close(pipefds[1]);
+	return pipefds[0];
+}
+
+static bool
+systemd_read(int fd, char **buf, size_t *size)
+{
+	debug("In systemd_read\n");
+	if (fifo_common_read(fd, &systemdbuf, &systemdused, &systemdsize)) {
+		/* systemd likes to include the terminating newline */
+		if (systemdused >= 1 && systemdbuf[systemdused - 1] == '\n') {
+			systemdbuf[systemdused - 1] = '\0';
+			systemdused--;
+		}
+		*buf = systemdbuf;
+		*size = systemdused;
+		return true;
+	}
+
+	return false;
+}
+
+static void
+systemd_finish(int fd)
+{
+	kill(systemdpid, SIGTERM);
+	fifo_common_finish(fd, &systemdbuf, &systemdused, &systemdsize);
+}
+
+/*****************************************************************************
+ * plymouth functions                                                        *
+ *****************************************************************************/
+
+#define PLYMOUTH_PATH "/bin/plymouth"
+static pid_t plymouthpid;
+static size_t plymouthused = 0;
+static size_t plymouthsize = 0;
+static char *plymouthbuf = NULL;
+
+static int
+plymouth_prepare(const char *prompt)
+{
+	int pipefds[2];
+
+	if (access(PLYMOUTH_PATH, X_OK))
+		return -1;
+
+	if (system(PLYMOUTH_PATH" --ping"))
+		return -1;
+
+	/* Plymouth will add a ':' if it is a non-graphical prompt */
+	char *prompt2 = strdup(prompt);
+	int len = strlen(prompt2);
+	if (len > 1 && prompt2[len-2] == ':' && prompt2[len - 1] == ' ')
+		prompt2[len - 2] = '\0';
+	else if (len > 0 && prompt2[len - 1] == ':')
+		prompt2[len - 1] = '\0';
+
+	if (pipe(pipefds))
+		return -1;
+
+	plymouthpid = fork();
+	if (plymouthpid < 0) {
+		close(pipefds[0]);
+		close(pipefds[1]);
+		return -1;
+	}
+
+	if (plymouthpid == 0) {
+		close(pipefds[0]);
+		if (dup2(pipefds[1], STDOUT_FILENO) < 0)
+			exit(EXIT_FAILURE);
+		execl(PLYMOUTH_PATH, PLYMOUTH_PATH,
+		      "ask-for-password", "--prompt", prompt2, (char*)NULL);
+		exit(EXIT_FAILURE);
+	}
+	free(prompt2);
+
+	close(pipefds[1]);
+	return pipefds[0];
+}
+
+static bool
+plymouth_read(int fd, char **buf, size_t *size)
+{
+	debug("In plymouth_read\n");
+	if (fifo_common_read(fd, &plymouthbuf, &plymouthused, &plymouthsize)) {
+		*buf = plymouthbuf;
+		*size = plymouthused;
+		return true;
+	}
+
+	return false;
+}
+
+static void
+plymouth_finish(int fd)
+{
+	kill(plymouthpid, SIGKILL);
+	fifo_common_finish(fd, &plymouthbuf, &plymouthused, &plymouthsize);
+}
+
+/*****************************************************************************
+ * fifo functions                                                            *
+ *****************************************************************************/
+#define FIFO_PATH "/lib/cryptsetup/passfifo"
+static size_t fifoused = 0;
+static size_t fifosize = 0;
+static char *fifobuf = NULL;
+
+static void
+fifo_finish(int fd)
+{
+	fifo_common_finish(fd, &fifobuf, &fifoused, &fifosize);
+}
+
+static bool
+fifo_read(int fd, char **buf, size_t *size)
+{
+	debug("In fifo_read\n");
+	if (fifo_common_read(fd, &fifobuf, &fifoused, &fifosize)) {
+		*buf = fifobuf;
+		*size = fifoused;
+		return true;
+	}
+
+	return false;
+}
+
+static int
+fifo_prepare(const char *prompt)
+{
+	int ret;
+
+	ret = mkfifo(FIFO_PATH, 0600);
+	if (ret && errno != EEXIST)
+		return -1;
+
+	return open(FIFO_PATH, O_RDONLY | O_NONBLOCK);
+}
+
+/*****************************************************************************
+ * console functions                                                         *
+ *****************************************************************************/
+#define CONSOLE_PATH "/dev/console"
+static struct termios term_old;
+static bool term_set = false;
+static char *consolebuf = NULL;
+static size_t consolebuflen = 0;
+
+static void
+console_finish(int fd)
+{
+	if (consolebuf) {
+		memset(consolebuf, '\0', consolebuflen);
+		free(consolebuf);
+		consolebuf = NULL;
+		consolebuflen = 0;
+	}
+
+	if (!term_set || fd < 0)
+		return;
+
+	term_set = false;
+	tcsetattr(fd, TCSAFLUSH, &term_old);
+	fprintf(stderr, "\n");
+	klogctl(7, NULL, 0);
+}
+
+bool
+console_read(int fd, char **buf, size_t *size)
+{
+	ssize_t nread;
+
+	/* Console is in ICANON mode so we'll get entire lines */
+	nread = getline(&consolebuf, &consolebuflen, stdin);
+
+	if (nread < 0) {
+		clearerr(stdin);
+		return false;
+	}
+
+	/* Strip trailing newline, if any */
+	if (nread > 0 && consolebuf[nread - 1] == '\n') {
+		nread--;
+		consolebuf[nread] = '\0';
+	}
+
+	*size = nread;
+	*buf = consolebuf;
+
+	return true;
+}
+
+static int
+console_prepare(const char *prompt)
+{
+	struct termios term_new;
+	const char *prompt_ptr = prompt;
+	char *newline = NULL;
+
+	if (!isatty(STDIN_FILENO)) {
+		if (access(CONSOLE_PATH, R_OK | W_OK)) {
+			debug("No access to console device " CONSOLE_PATH "\n");
+			return -1;
+		}
+
+		if (!freopen(CONSOLE_PATH, "r", stdin)  ||
+		    !freopen(CONSOLE_PATH, "a", stdout) ||
+		    !freopen(CONSOLE_PATH, "a", stderr) ||
+		    !isatty(STDIN_FILENO)) {
+			debug("Failed to open console\n");
+			return -1;
+		}
+	}
+
+	if (tcgetattr(STDIN_FILENO, &term_old)) {
+		debug("Failed to get terminal settings\n");
+		return -1;
+	}
+
+	term_new = term_old;
+	term_new.c_lflag &= ~ECHO;
+	term_new.c_lflag |= ICANON;
+
+	if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_new)) {
+		debug("Failed to disable echoing\n");
+		return -1;
+	}
+
+	/* handle any non-literal embedded newlines in prompt */
+	while ( (newline = strstr(prompt_ptr,"\\n")) != NULL ) {
+		/* Calculate length of string leading up to newline. */
+		int line_len = newline - prompt_ptr;
+
+		/* Force trimming of prompt to location of newline. */
+		if (fwrite(prompt_ptr, line_len, 1, stderr) < 1 ||
+		    fwrite("\n", 1, 1, stderr) < 1) {
+			debug("Failed to print prompt\n");
+			tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_old);
+			return -1;
+		}
+
+		/* Skip over newline. */
+		prompt_ptr = newline + 2;
+	}
+	if (fputs(prompt_ptr, stderr) < 0) {
+		debug("Failed to print prompt\n");
+		tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_old);
+		return -1;
+	}
+
+	/* Disable printk to console */
+	klogctl(6, NULL, 0);
+	term_set = true;
+	return STDIN_FILENO;
+}
+
+/*****************************************************************************
+ * main functions                                                            *
+ *****************************************************************************/
+
+struct method {
+	const char *name;
+	int (*prepare)(const char *prompt);
+	bool (*read)(int fd, char **buf, size_t *size);
+	void (*finish)(int fd);
+	bool no_more;
+	bool active;
+	bool enabled;
+	int fd;
+};
+
+static struct method methods[] = {
+	{ "systemd", systemd_prepare, systemd_read, systemd_finish, true, false, true, -1 },
+	{ "fifo", fifo_prepare, fifo_read, fifo_finish, false, false, true, -1 },
+	{ "plymouth", plymouth_prepare, plymouth_read, plymouth_finish, true, false, true, -1 },
+	{ "console", console_prepare, console_read, console_finish, false, false, true, -1 }
+};
+
+static bool
+disable_method(const char *method)
+{
+	int i;
+	bool result = false;
+
+	debug("Disabling method %s\n", method ? method : "ALL");
+
+	for (i = 0; i < ARRAY_SIZE(methods); i++) {
+		/* A NULL method means all methods should be disabled */
+		if (method && strcmp(methods[i].name, method))
+			continue;
+		if (!methods[i].enabled)
+			continue;
+		if (methods[i].active)
+			methods[i].finish(methods[i].fd);
+
+		methods[i].active = false;
+		methods[i].fd = -1;
+		methods[i].enabled = false;
+		result = true;
+	}
+
+	return result;
+}
+
+int
+main(int argc, char **argv, char **envp)
+{
+	char *pass = NULL;
+	size_t passlen = 0;
+	int i;
+	int nfds;
+	fd_set fds;
+	int ret;
+	bool done = false;
+	sigset_t sigset;
+
+	if (argc != 2)
+		usage(argv[0], "incorrect number of arguments");
+
+	sigfillset(&sigset);
+	sigprocmask(SIG_BLOCK, &sigset, NULL);
+
+	for (i = 0; i < ARRAY_SIZE(methods); i++) {
+		if (!methods[i].enabled)
+			continue;
+		debug("Enabling method %s\n", methods[i].name);
+		methods[i].fd = methods[i].prepare(argv[1]);
+		if (methods[i].fd < 0) {
+			methods[i].active = false;
+			methods[i].enabled = false;
+		} else {
+			methods[i].active = true;
+			methods[i].enabled = true;
+			if (methods[i].no_more)
+				break;
+		}
+	}
+
+	while (!done) {
+		nfds = 0;
+		FD_ZERO(&fds);
+		for (i = 0; i < ARRAY_SIZE(methods); i++) {
+			if (!methods[i].enabled || methods[i].fd < 0)
+				continue;
+			debug("method %i has fd %i and name %s\n", i, methods[i].fd, methods[i].name);
+			FD_SET(methods[i].fd, &fds);
+			if (methods[i].fd + 1 > nfds)
+				nfds = methods[i].fd + 1;
+		}
+
+		if (nfds == 0) {
+			debug("All methods disabled\n");
+			exit(EXIT_FAILURE);
+		}
+
+		debug("Starting select with nfds %i\n", nfds);
+		ret = select(nfds, &fds, NULL, NULL, NULL);
+
+		if (ret <= 0) {
+			if (ret == 0 || errno == EINTR)
+				continue;
+			debug("Select failed\n");
+			disable_method(NULL);
+			exit(EXIT_FAILURE);
+		}
+
+		for (i = 0; i < ARRAY_SIZE(methods); i++) {
+			if (!methods[i].enabled || methods[i].fd < 0)
+				continue;
+			if (!FD_ISSET(methods[i].fd, &fds))
+				continue;
+			if (methods[i].read(methods[i].fd, &pass, &passlen) && pass) {
+				done = true;
+				break;
+			}
+		}
+	}
+
+	debug("Writing %i bytes to stdout\n", (int)passlen);
+	if (write(STDOUT_FILENO, pass, passlen) == -1) {
+		disable_method(NULL);
+		exit(EXIT_FAILURE);
+	}
+	disable_method(NULL);
+	exit(EXIT_SUCCESS);
+}
+