diff options
Diffstat (limited to 'plugins/sudoers/auth/rfc1938.c')
| -rw-r--r-- | plugins/sudoers/auth/rfc1938.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/rfc1938.c b/plugins/sudoers/auth/rfc1938.c new file mode 100644 index 0000000..bde9e33 --- /dev/null +++ b/plugins/sudoers/auth/rfc1938.c @@ -0,0 +1,141 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1994-1996, 1998-2005, 2010-2012, 2014-2015 + * 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> + +#if defined(HAVE_SKEY) || defined(HAVE_OPIE) + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <pwd.h> + +#if defined(HAVE_SKEY) +# include <skey.h> +# define RFC1938 skey +# ifdef HAVE_RFC1938_SKEYCHALLENGE +# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c),(d)) +# else +# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c)) +# endif +# define rfc1938verify(a,b) skeyverify((a),(b)) +#elif defined(HAVE_OPIE) +# include <opie.h> +# define RFC1938 opie +# define rfc1938challenge(a,b,c,d) opiechallenge((a),(b),(c)) +# define rfc1938verify(a,b) opieverify((a),(b)) +#endif + +#include <sudoers.h> +#include "sudo_auth.h" + +int +sudo_rfc1938_setup(const struct sudoers_context *ctx, struct passwd *pw, + char **promptp, sudo_auth *auth) +{ + char challenge[256]; + size_t challenge_len; + static char *orig_prompt = NULL, *new_prompt = NULL; + static size_t op_len, np_size; + static struct RFC1938 rfc1938; + debug_decl(sudo_rfc1938_setup, SUDOERS_DEBUG_AUTH); + + /* Stash a pointer to the rfc1938 struct if we have not initialized */ + if (!auth->data) + auth->data = &rfc1938; + + /* Save the original prompt */ + if (orig_prompt == NULL) { + orig_prompt = *promptp; + op_len = strlen(orig_prompt); + + /* Ignore trailing colon (we will add our own) */ + if (orig_prompt[op_len - 1] == ':') + op_len--; + else if (op_len >= 2 && orig_prompt[op_len - 1] == ' ' + && orig_prompt[op_len - 2] == ':') + op_len -= 2; + } + +#ifdef HAVE_SKEY + /* Close old stream */ + if (rfc1938.keyfile) + (void) fclose(rfc1938.keyfile); +#endif + + /* + * Look up the user and get the rfc1938 challenge. + * If the user is not in the OTP db, only post a fatal error if + * we are running alone (since they may just use a normal passwd). + */ + if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) { + if (IS_ONEANDONLY(auth)) { + sudo_warnx(U_("you do not exist in the %s database"), auth->name); + debug_return_int(AUTH_ERROR); + } else { + debug_return_int(AUTH_FAILURE); + } + } + + /* Get space for new prompt with embedded challenge */ + challenge_len = strlen(challenge); + if (np_size < op_len + challenge_len + 7) { + char *p = realloc(new_prompt, op_len + challenge_len + 7); + if (p == NULL) { + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + debug_return_int(AUTH_ERROR); + } + np_size = op_len + challenge_len + 7; + new_prompt = p; + } + + if (def_long_otp_prompt) + (void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt); + else + (void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", (int)op_len, + orig_prompt, challenge); + + *promptp = new_prompt; + debug_return_int(AUTH_SUCCESS); +} + +int +sudo_rfc1938_verify(const struct sudoers_context *ctx, struct passwd *pw, + const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback) +{ + debug_decl(sudo_rfc1938_verify, SUDOERS_DEBUG_AUTH); + + if (rfc1938verify((struct RFC1938 *) auth->data, (char *)pass) == 0) + debug_return_int(AUTH_SUCCESS); + else + debug_return_int(AUTH_FAILURE); +} + +#endif /* HAVE_SKEY || HAVE_OPIE */ |