/* * Copyright (c) 2000-2004 Todd C. Miller * * 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. */ #include "config.h" #include #include #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # include #else # ifdef HAVE_STRINGS_H # include # endif #endif /* HAVE_STRING_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #include #include #include #include #include #include "sudo.h" #include "sudo_auth.h" #ifndef lint static const char rcsid[] = "$Sudo: bsdauth.c,v 1.16 2004/06/07 00:02:56 millert Exp $"; #endif /* lint */ extern char *login_style; /* from sudo.c */ int bsdauth_init(pw, promptp, auth) struct passwd *pw; char **promptp; sudo_auth *auth; { static auth_session_t *as; extern login_cap_t *lc; /* from sudo.c */ if ((as = auth_open()) == NULL) { log_error(USE_ERRNO|NO_EXIT|NO_MAIL, "unable to begin bsd authentication"); return(AUTH_FATAL); } /* XXX - maybe sanity check the auth style earlier? */ login_style = login_getstyle(lc, login_style, "auth-sudo"); if (login_style == NULL) { log_error(NO_EXIT|NO_MAIL, "invalid authentication type"); auth_close(as); return(AUTH_FATAL); } if (auth_setitem(as, AUTHV_STYLE, login_style) < 0 || auth_setitem(as, AUTHV_NAME, pw->pw_name) < 0 || auth_setitem(as, AUTHV_CLASS, login_class) < 0) { log_error(NO_EXIT|NO_MAIL, "unable to setup authentication"); auth_close(as); return(AUTH_FATAL); } auth->data = (VOID *) as; return(AUTH_SUCCESS); } int bsdauth_verify(pw, prompt, auth) struct passwd *pw; char *prompt; sudo_auth *auth; { char *pass; char *s; size_t len; int authok = 0; sigaction_t sa, osa; auth_session_t *as = (auth_session_t *) auth->data; extern int nil_pw; /* save old signal handler */ sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; sa.sa_handler = SIG_DFL; (void) sigaction(SIGCHLD, &sa, &osa); /* * If there is a challenge then print that instead of the normal * prompt. If the user just hits return we prompt again with echo * turned on, which is useful for challenge/response things like * S/Key. */ if ((s = auth_challenge(as)) == NULL) { pass = tgetpass(prompt, def_passwd_timeout * 60, tgetpass_flags); } else { pass = tgetpass(s, def_passwd_timeout * 60, tgetpass_flags); if (pass && *pass == '\0') { if ((prompt = strrchr(s, '\n'))) prompt++; else prompt = s; /* * Append '[echo on]' to the last line of the challenge and * reprompt with echo turned on. */ len = strlen(prompt) - 1; while (isspace(prompt[len]) || prompt[len] == ':') prompt[len--] = '\0'; easprintf(&s, "%s [echo on]: ", prompt); pass = tgetpass(s, def_passwd_timeout * 60, tgetpass_flags | TGP_ECHO); free(s); } } if (!pass || *pass == '\0') /* ^C or empty password */ nil_pw = 1; if (pass) { authok = auth_userresponse(as, (char *)pass, 1); zero_bytes(pass, strlen(pass)); } /* restore old signal handler */ (void) sigaction(SIGCHLD, &osa, NULL); if (authok) return(AUTH_SUCCESS); if ((s = auth_getvalue(as, "errormsg")) != NULL) log_error(NO_EXIT|NO_MAIL, "%s", s); return(AUTH_FAILURE); } int bsdauth_cleanup(pw, auth) struct passwd *pw; sudo_auth *auth; { auth_session_t *as = (auth_session_t *) auth->data; auth_close(as); return(AUTH_SUCCESS); }