Adding upstream version 1.9.15p5.upstream/1.9.15p5upstream

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

1 files changed, 314 insertions, 0 deletions

diff --git a/plugins/sudoers/auth/aix_auth.c b/plugins/sudoers/auth/aix_auth.c
new file mode 100644
index 0000000..74a3bc9
--- /dev/null
+++ b/plugins/sudoers/auth/aix_auth.c
@@ -0,0 +1,314 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1999-2005, 2007-2018 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>
+
+#ifdef HAVE_AIXAUTH
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+#include <signal.h>
+#include <usersec.h>
+
+#include <sudoers.h>
+#include "sudo_auth.h"
+
+/*
+ * For a description of the AIX authentication API, see
+ * http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/basetrf1/authenticate.htm
+ */
+
+#ifdef HAVE_PAM
+# define AIX_AUTH_UNKNOWN	0
+# define AIX_AUTH_STD		1
+# define AIX_AUTH_PAM		2
+
+static int
+sudo_aix_authtype(void)
+{
+    size_t linesize = 0;
+    ssize_t len;
+    char *cp, *line = NULL;
+    bool in_stanza = false;
+    int authtype = AIX_AUTH_UNKNOWN;
+    FILE *fp;
+    debug_decl(sudo_aix_authtype, SUDOERS_DEBUG_AUTH);
+
+    if ((fp = fopen("/etc/security/login.cfg", "r")) == NULL)
+	debug_return_int(AIX_AUTH_UNKNOWN);
+
+    while ((len = getdelim(&line, &linesize, '\n', fp)) != -1) {
+	/* First remove comments. */
+	if ((cp = strchr(line, '#')) != NULL) {
+	    *cp = '\0';
+	    len = (ssize_t)(cp - line);
+	}
+
+	/* Next remove trailing newlines and whitespace. */
+	while (len > 0 && isspace((unsigned char)line[len - 1]))
+	    line[--len] = '\0';
+
+	/* Skip blank lines. */
+	if (len == 0)
+	    continue;
+
+	/* Match start of the usw stanza. */
+	if (!in_stanza) {
+	    if (strncmp(line, "usw:", 4) == 0)
+		in_stanza = true;
+	    continue;
+	}
+
+	/* Check for end of the usw stanza. */
+	if (!isblank((unsigned char)line[0])) {
+	    in_stanza = false;
+	    break;
+	}
+
+	/* Skip leading blanks. */
+	cp = line;
+	do {
+	    cp++;
+	} while (isblank((unsigned char)*cp));
+
+	/* Match "auth_type = (PAM_AUTH|STD_AUTH)". */
+	if (strncmp(cp, "auth_type", 9) != 0)
+	    continue;
+	cp += 9;
+	while (isblank((unsigned char)*cp))
+	    cp++;
+	if (*cp++ != '=')
+	    continue;
+	while (isblank((unsigned char)*cp))
+	    cp++;
+	if (strcmp(cp, "PAM_AUTH") == 0) {
+	    authtype = AIX_AUTH_PAM;
+	    break;
+	}
+	if (strcmp(cp, "STD_AUTH") == 0) {
+	    authtype = AIX_AUTH_STD;
+	    break;
+	}
+    }
+    free(line);
+    fclose(fp);
+
+    debug_return_int(authtype);
+}
+#endif /* HAVE_PAM */
+
+int
+sudo_aix_init(const struct sudoers_context *ctx, struct passwd *pw,
+    sudo_auth *auth)
+{
+    debug_decl(sudo_aix_init, SUDOERS_DEBUG_AUTH);
+
+#ifdef HAVE_PAM
+    /* Check auth_type in /etc/security/login.cfg. */
+    if (sudo_aix_authtype() == AIX_AUTH_PAM) {
+	if (sudo_pam_init_quiet(ctx, pw, auth) == AUTH_SUCCESS) {
+	    /* Fail AIX authentication so we can use PAM instead. */
+	    debug_return_int(AUTH_FAILURE);
+	}
+    }
+#endif
+    debug_return_int(AUTH_SUCCESS);
+}
+
+/* Ignore AIX password incorrect message */
+static bool
+sudo_aix_valid_message(const char *message)
+{
+    const char *cp;
+    const char badpass_msgid[] = "3004-300";
+    debug_decl(sudo_aix_valid_message, SUDOERS_DEBUG_AUTH);
+
+    if (message == NULL || message[0] == '\0')
+	debug_return_bool(false);
+
+    /* Match "3004-300: You entered an invalid login name or password" */
+    for (cp = message; *cp != '\0'; cp++) {
+	if (isdigit((unsigned char)*cp)) {
+	    if (strncmp(cp, badpass_msgid, strlen(badpass_msgid)) == 0)
+		debug_return_bool(false);
+	    break;
+	}
+    }
+    debug_return_bool(true);
+}
+
+/* 
+ * Change the user's password.  If root changes the user's password
+ * the ADMCHG flag is set on the account (and the user must change
+ * it again) so we run passwd(1) as the user.  This does mean that
+ * the user will need to re-enter their original password again,
+ * unlike with su(1).  We may consider using pwdadm(1) as root to
+ * change the password and then clear the flag in the future.
+ */
+static bool
+sudo_aix_change_password(const struct sudoers_context *ctx, const char *user)
+{
+    struct sigaction sa, savechld;
+    pid_t child, pid;
+    bool ret = false;
+    sigset_t mask;
+    int status;
+    debug_decl(sudo_aix_change_password, SUDOERS_DEBUG_AUTH);
+
+    /* Set SIGCHLD handler to default since we call waitpid() below. */
+    memset(&sa, 0, sizeof(sa));                
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_RESTART;     
+    sa.sa_handler = SIG_DFL;
+    (void) sigaction(SIGCHLD, &sa, &savechld);
+
+    switch (child = sudo_debug_fork()) {
+    case -1:
+	/* error */
+	sudo_warn("%s", U_("unable to fork"));
+	break;
+    case 0:
+	/* child, run passwd(1) */
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGINT);
+	sigaddset(&mask, SIGQUIT);
+	(void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
+	set_perms(ctx, PERM_USER);
+	execl("/usr/bin/passwd", "passwd", user, (char *)NULL);
+	sudo_warn("passwd");
+	_exit(127);
+	/* NOTREACHED */
+    default:
+	/* parent */
+	break;
+    }
+
+    /* Wait for passwd(1) to complete. */
+    do {
+	pid = waitpid(child, &status, 0);
+    } while (pid == -1 && errno == EINTR);
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"child (%d) exit value %d", (int)child, status);
+    if (pid != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
+	ret = true;
+
+    /* Restore saved SIGCHLD handler. */
+    (void) sigaction(SIGCHLD, &savechld, NULL);
+
+    debug_return_bool(ret);
+}
+
+int
+sudo_aix_verify(const struct sudoers_context *ctx, struct passwd *pw,
+    const char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+    char *pass, *message = NULL;
+    int result = 1, reenter = 0;
+    int ret = AUTH_SUCCESS;
+    debug_decl(sudo_aix_verify, SUDOERS_DEBUG_AUTH);
+
+    if (IS_NONINTERACTIVE(auth))
+        debug_return_int(AUTH_NONINTERACTIVE);
+
+    do {
+	pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	if (pass == NULL)
+	    break;
+	free(message);
+	message = NULL;
+	result = authenticate(pw->pw_name, pass, &reenter, &message);
+	freezero(pass, strlen(pass));
+	prompt = message;
+    } while (reenter);
+
+    if (result != 0) {
+	/* Display error message, if any. */
+	if (sudo_aix_valid_message(message))
+	    sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY,
+		"%s", message);
+	ret = pass ? AUTH_FAILURE : AUTH_INTR;
+    }
+    free(message);
+    message = NULL;
+
+    /* Check if password expired and allow user to change it if possible. */
+    if (ret == AUTH_SUCCESS) {
+	result = passwdexpired(pw->pw_name, &message);
+	if (message != NULL && message[0] != '\0') {
+	    int msg_type = SUDO_CONV_PREFER_TTY;
+	    msg_type |= result ? SUDO_CONV_ERROR_MSG : SUDO_CONV_INFO_MSG,
+	    sudo_printf(msg_type, "%s", message);
+	    free(message);
+	    message = NULL;
+	}
+	switch (result) {
+	case 0:
+	    /* password not expired. */
+	    break;
+	case 1:
+	    /* password expired, user must change it */
+	    if (!sudo_aix_change_password(ctx, pw->pw_name)) {
+		sudo_warnx(U_("unable to change password for %s"), pw->pw_name);
+		ret = AUTH_ERROR;
+	    }
+	    break;
+	case 2:
+	    /* password expired, only admin can change it */
+	    ret = AUTH_ERROR;
+	    break;
+	default:
+	    /* error (-1) */
+	    sudo_warn("passwdexpired");
+	    ret = AUTH_ERROR;
+	    break;
+	}
+    }
+
+    debug_return_int(ret);
+}
+
+int
+sudo_aix_cleanup(const struct sudoers_context *ctx, struct passwd *pw,
+    sudo_auth *auth, bool force)
+{
+    debug_decl(sudo_aix_cleanup, SUDOERS_DEBUG_AUTH);
+
+    /* Unset AUTHSTATE as it may not be correct for the runas user. */
+    if (sudo_unsetenv("AUTHSTATE") == -1)
+	debug_return_int(AUTH_FAILURE);
+
+    debug_return_int(AUTH_SUCCESS);
+}
+
+#endif /* HAVE_AIXAUTH */