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//
// login.c
//
// Sign on user
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#include <os.h>
#include <string.h>
#define NAMESIZE 32
int main(int argc, char *argv[]) {
struct utsname sys;
char username[NAMESIZE];
char password[NAMESIZE];
char *p;
char ch;
int rc;
char enter;
struct passwd *pwd;
char *shell;
// Get system information
memset(&sys, 0, sizeof(struct utsname));
uname(&sys);
// Determine console newline character
enter = (gettib()->proc->term->type == TERM_CONSOLE) ? '\r' : '\n';
// Print banner
write(fdout, sys.sysname, strlen(sys.sysname));
write(fdout, " version ", 9);
write(fdout, sys.release, strlen(sys.release));
write(fdout, " (", 2);
write(fdout, sys.version, strlen(sys.version));
write(fdout, ")\r\n", 3);
for (;;) {
// Clear credentials
memset(username, 0, NAMESIZE);
memset(password, 0, NAMESIZE);
// Get user name
if (argc > 1) {
strncpy(username, argv[1], NAMESIZE);
} else {
while (!*username) {
if (*sys.nodename) {
write(fdout, sys.nodename, strlen(sys.nodename));
write(fdout, " ", 1);
}
write(fdout, "login: ", 7);
p = username;
for (;;) {
rc = read(fdin, &ch, 1);
if (rc < 0) return 0;
if (ch == 0x03) return 0;
if (ch == '\r' || ch == '\n') {
if (ch == enter) {
break;
} else {
continue;
}
}
if (ch > ' ') {
write(fdout, &ch, 1);
if (p < username + NAMESIZE - 1) *p++ = ch;
}
}
*p = 0;
write(fdout, "\r\n", 2);
}
}
// Lookup user in user database
pwd = getpwnam(username);
if (pwd && !*pwd->pw_passwd) break;
// Get password
write(fdout, "Password: ", 10);
p = password;
for (;;) {
rc = read(fdin, &ch, 1);
if (rc < 0) return 0;
if (ch == 0x03) return 0;
if (ch == '\r' || ch == '\n') {
if (ch == enter) {
break;
} else {
continue;
}
}
if (p < password + NAMESIZE - 1) *p++ = ch;
}
*p = 0;
write(fdout, "\r\n", 2);
// Check password
if (pwd) {
p = crypt(password, pwd->pw_passwd);
if (p && strcmp(p, pwd->pw_passwd) == 0) {
memset(password, 0, NAMESIZE);
break;
}
}
// Login failed
sleep(2);
write(fdout, "Login incorrect\r\n", 17);
}
// Switch user and group id
if (initgroups(pwd->pw_name, pwd->pw_gid) < 0 || setgid(pwd->pw_gid) < 0 || setuid(pwd->pw_uid) < 0) {
write(fdout, "Permission denied\r\n", 19);
return 0;
}
// Launch shell
shell = pwd->pw_shell;
if (!shell || !*shell) shell = "/bin/sh";
if (spawn(P_WAIT, NULL, shell, NULL, NULL) < 0) {
write(fdout, "No shell\r\n", 10);
sleep(2);
}
return 0;
}