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-rw-r--r--src/conversation.c213
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diff --git a/src/conversation.c b/src/conversation.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1999-2005, 2007-2012 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "sudo.h"
+#include "sudo_plugin.h"
+#include "sudo_plugin_int.h"
+
+extern int tgetpass_flags; /* XXX */
+
+/*
+ * Sudo conversation function.
+ */
+int
+sudo_conversation(int num_msgs, const struct sudo_conv_message msgs[],
+ struct sudo_conv_reply replies[], struct sudo_conv_callback *callback)
+{
+ char *pass;
+ int n;
+ const int conv_debug_instance = sudo_debug_get_active_instance();
+
+ sudo_debug_set_active_instance(sudo_debug_instance);
+
+ for (n = 0; n < num_msgs; n++) {
+ const struct sudo_conv_message *msg = &msgs[n];
+ int flags = tgetpass_flags;
+ FILE *fp = stdout;
+
+ switch (msg->msg_type & 0xff) {
+ case SUDO_CONV_PROMPT_ECHO_ON:
+ SET(flags, TGP_ECHO);
+ goto read_pass;
+ case SUDO_CONV_PROMPT_MASK:
+ SET(flags, TGP_MASK);
+ FALLTHROUGH;
+ case SUDO_CONV_PROMPT_ECHO_OFF:
+ if (ISSET(msg->msg_type, SUDO_CONV_PROMPT_ECHO_OK))
+ SET(flags, TGP_NOECHO_TRY);
+ read_pass:
+ /* Read the password unless interrupted. */
+ if (replies == NULL)
+ goto err;
+ pass = tgetpass(msg->msg, msg->timeout, flags, callback);
+ if (pass == NULL)
+ goto err;
+ replies[n].reply = strdup(pass);
+ if (replies[n].reply == NULL) {
+ sudo_fatalx_nodebug(U_("%s: %s"), "sudo_conversation",
+ U_("unable to allocate memory"));
+ }
+ explicit_bzero(pass, strlen(pass));
+ break;
+ case SUDO_CONV_ERROR_MSG:
+ fp = stderr;
+ FALLTHROUGH;
+ case SUDO_CONV_INFO_MSG:
+ if (msg->msg != NULL) {
+ size_t len = strlen(msg->msg);
+ const char *crnl = NULL;
+ bool written = false;
+ int ttyfd = -1;
+ bool raw_tty = false;
+
+ if (ISSET(msg->msg_type, SUDO_CONV_PREFER_TTY) &&
+ !ISSET(tgetpass_flags, TGP_STDIN)) {
+ ttyfd = open(_PATH_TTY, O_WRONLY);
+ raw_tty = sudo_term_is_raw(ttyfd);
+ } else {
+ raw_tty = sudo_term_is_raw(fileno(fp));
+ }
+ if (len != 0 && raw_tty) {
+ /* Convert nl -> cr nl in case tty is in raw mode. */
+ if (msg->msg[len - 1] == '\n') {
+ if (len == 1 || msg->msg[len - 2] != '\r') {
+ len--;
+ crnl = "\r\n";
+ }
+ }
+ }
+ if (ttyfd != -1) {
+ /* Try writing to tty but fall back to fp on error. */
+ if ((len == 0 || write(ttyfd, msg->msg, len) != -1) &&
+ (crnl == NULL || write(ttyfd, crnl, 2) != -1)) {
+ written = true;
+ }
+ close(ttyfd);
+ }
+ if (!written) {
+ if (len != 0 && fwrite(msg->msg, 1, len, fp) == 0)
+ goto err;
+ if (crnl != NULL && fwrite(crnl, 1, 2, fp) == 0)
+ goto err;
+ }
+ }
+ break;
+ default:
+ goto err;
+ }
+ }
+
+ sudo_debug_set_active_instance(conv_debug_instance);
+ return 0;
+
+err:
+ /* Zero and free allocated memory and return an error. */
+ if (replies != NULL) {
+ do {
+ struct sudo_conv_reply *repl = &replies[n];
+ if (repl->reply == NULL)
+ continue;
+ freezero(repl->reply, strlen(repl->reply));
+ repl->reply = NULL;
+ } while (n--);
+ }
+
+ sudo_debug_set_active_instance(conv_debug_instance);
+ return -1;
+}
+
+int
+sudo_conversation_1_7(int num_msgs, const struct sudo_conv_message msgs[],
+ struct sudo_conv_reply replies[])
+{
+ return sudo_conversation(num_msgs, msgs, replies, NULL);
+}
+
+int
+sudo_conversation_printf(int msg_type, const char *fmt, ...)
+{
+ const char *crnl = NULL;
+ FILE *ttyfp = NULL;
+ FILE *fp = stdout;
+ char fmt2[1024];
+ va_list ap;
+ int len;
+ const int conv_debug_instance = sudo_debug_get_active_instance();
+
+ sudo_debug_set_active_instance(sudo_debug_instance);
+
+ if (ISSET(msg_type, SUDO_CONV_PREFER_TTY) &&
+ !ISSET(tgetpass_flags, TGP_STDIN)) {
+ /* Try writing to /dev/tty first. */
+ ttyfp = fopen(_PATH_TTY, "w");
+ }
+
+ switch (msg_type & 0xff) {
+ case SUDO_CONV_ERROR_MSG:
+ fp = stderr;
+ FALLTHROUGH;
+ case SUDO_CONV_INFO_MSG:
+ /* Convert nl -> cr nl in case tty is in raw mode. */
+ len = strlen(fmt);
+ if (sudo_term_is_raw(fileno(ttyfp ? ttyfp : fp))) {
+ if (len < ssizeof(fmt2) && len > 0 && fmt[len - 1] == '\n') {
+ if (len == 1 || fmt[len - 2] != '\r') {
+ memcpy(fmt2, fmt, len - 1);
+ fmt2[len - 1] = '\0';
+ fmt = fmt2;
+ crnl = "\r\n";
+ }
+ }
+ }
+ va_start(ap, fmt);
+ len = vfprintf(ttyfp ? ttyfp : fp, fmt, ap);
+ va_end(ap);
+ if (len >= 0 && crnl != NULL) {
+ len += fwrite(crnl, 1, 2, ttyfp ? ttyfp : fp);
+ }
+ break;
+ default:
+ len = -1;
+ errno = EINVAL;
+ break;
+ }
+
+ if (ttyfp != NULL)
+ fclose(ttyfp);
+
+ sudo_debug_set_active_instance(conv_debug_instance);
+ return len;
+}