Annotation of embedaddon/sudo/plugins/sudoers/auth/bsdauth.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (c) 2000-2005, 2007-2008, 2010-2011
! 3: * Todd C. Miller <Todd.Miller@courtesan.com>
! 4: *
! 5: * Permission to use, copy, modify, and distribute this software for any
! 6: * purpose with or without fee is hereby granted, provided that the above
! 7: * copyright notice and this permission notice appear in all copies.
! 8: *
! 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 16: *
! 17: * Sponsored in part by the Defense Advanced Research Projects
! 18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
! 19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
! 20: */
! 21:
! 22: #include <config.h>
! 23:
! 24: #include <sys/types.h>
! 25: #include <sys/param.h>
! 26: #include <stdio.h>
! 27: #ifdef STDC_HEADERS
! 28: # include <stdlib.h>
! 29: # include <stddef.h>
! 30: #else
! 31: # ifdef HAVE_STDLIB_H
! 32: # include <stdlib.h>
! 33: # endif
! 34: #endif /* STDC_HEADERS */
! 35: #ifdef HAVE_STRING_H
! 36: # include <string.h>
! 37: #endif /* HAVE_STRING_H */
! 38: #ifdef HAVE_STRINGS_H
! 39: # include <strings.h>
! 40: #endif /* HAVE_STRING_H */
! 41: #ifdef HAVE_UNISTD_H
! 42: # include <unistd.h>
! 43: #endif /* HAVE_UNISTD_H */
! 44: #include <ctype.h>
! 45: #include <pwd.h>
! 46: #include <signal.h>
! 47:
! 48: #include <login_cap.h>
! 49: #include <bsd_auth.h>
! 50:
! 51: #include "sudoers.h"
! 52: #include "sudo_auth.h"
! 53:
! 54: extern char *login_style; /* from sudo.c */
! 55:
! 56: int
! 57: bsdauth_init(struct passwd *pw, sudo_auth *auth)
! 58: {
! 59: static auth_session_t *as;
! 60: extern login_cap_t *lc; /* from sudo.c */
! 61:
! 62: if ((as = auth_open()) == NULL) {
! 63: log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
! 64: _("unable to begin bsd authentication"));
! 65: return AUTH_FATAL;
! 66: }
! 67:
! 68: /* XXX - maybe sanity check the auth style earlier? */
! 69: login_style = login_getstyle(lc, login_style, "auth-sudo");
! 70: if (login_style == NULL) {
! 71: log_error(NO_EXIT|NO_MAIL, _("invalid authentication type"));
! 72: auth_close(as);
! 73: return AUTH_FATAL;
! 74: }
! 75:
! 76: if (auth_setitem(as, AUTHV_STYLE, login_style) < 0 ||
! 77: auth_setitem(as, AUTHV_NAME, pw->pw_name) < 0 ||
! 78: auth_setitem(as, AUTHV_CLASS, login_class) < 0) {
! 79: log_error(NO_EXIT|NO_MAIL, _("unable to setup authentication"));
! 80: auth_close(as);
! 81: return AUTH_FATAL;
! 82: }
! 83:
! 84: auth->data = (void *) as;
! 85: return AUTH_SUCCESS;
! 86: }
! 87:
! 88: int
! 89: bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
! 90: {
! 91: char *pass;
! 92: char *s;
! 93: size_t len;
! 94: int authok = 0;
! 95: sigaction_t sa, osa;
! 96: auth_session_t *as = (auth_session_t *) auth->data;
! 97:
! 98: /* save old signal handler */
! 99: sigemptyset(&sa.sa_mask);
! 100: sa.sa_flags = SA_RESTART;
! 101: sa.sa_handler = SIG_DFL;
! 102: (void) sigaction(SIGCHLD, &sa, &osa);
! 103:
! 104: /*
! 105: * If there is a challenge then print that instead of the normal
! 106: * prompt. If the user just hits return we prompt again with echo
! 107: * turned on, which is useful for challenge/response things like
! 108: * S/Key.
! 109: */
! 110: if ((s = auth_challenge(as)) == NULL) {
! 111: pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
! 112: } else {
! 113: pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
! 114: if (pass && *pass == '\0') {
! 115: if ((prompt = strrchr(s, '\n')))
! 116: prompt++;
! 117: else
! 118: prompt = s;
! 119:
! 120: /*
! 121: * Append '[echo on]' to the last line of the challenge and
! 122: * reprompt with echo turned on.
! 123: */
! 124: len = strlen(prompt) - 1;
! 125: while (isspace(prompt[len]) || prompt[len] == ':')
! 126: prompt[len--] = '\0';
! 127: easprintf(&s, "%s [echo on]: ", prompt);
! 128: pass = auth_getpass(prompt, def_passwd_timeout * 60,
! 129: SUDO_CONV_PROMPT_ECHO_ON);
! 130: free(s);
! 131: }
! 132: }
! 133:
! 134: if (pass) {
! 135: authok = auth_userresponse(as, pass, 1);
! 136: zero_bytes(pass, strlen(pass));
! 137: }
! 138:
! 139: /* restore old signal handler */
! 140: (void) sigaction(SIGCHLD, &osa, NULL);
! 141:
! 142: if (authok)
! 143: return AUTH_SUCCESS;
! 144:
! 145: if (!pass)
! 146: return AUTH_INTR;
! 147:
! 148: if ((s = auth_getvalue(as, "errormsg")) != NULL)
! 149: log_error(NO_EXIT|NO_MAIL, "%s", s);
! 150: return AUTH_FAILURE;
! 151: }
! 152:
! 153: int
! 154: bsdauth_cleanup(struct passwd *pw, sudo_auth *auth)
! 155: {
! 156: auth_session_t *as = (auth_session_t *) auth->data;
! 157:
! 158: auth_close(as);
! 159:
! 160: return AUTH_SUCCESS;
! 161: }
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