diff options
Diffstat (limited to 'lib/pam_get_authtok.c')
| -rw-r--r-- | lib/pam_get_authtok.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/lib/pam_get_authtok.c b/lib/pam_get_authtok.c new file mode 100644 index 0000000..2a974c9 --- /dev/null +++ b/lib/pam_get_authtok.c @@ -0,0 +1,171 @@ +/*- + * Copyright (c) 2002-2003 Networks Associates Technology, Inc. + * Copyright (c) 2004-2007 Dag-Erling Smørgrav + * All rights reserved. + * + * This software was developed for the FreeBSD Project by ThinkSec AS and + * Network Associates Laboratories, the Security Research Division of + * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 + * ("CBOSS"), as part of the DARPA CHATS research program. + * + * 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. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $Id: pam_get_authtok.c 408 2007-12-21 11:36:24Z des $ + */ + +#include <sys/param.h> + +#include <stdlib.h> +#include <string.h> + +#include <security/pam_appl.h> +#include <security/openpam.h> + +#include "openpam_impl.h" + +static const char authtok_prompt[] = "Password:"; +static const char oldauthtok_prompt[] = "Old Password:"; +static const char newauthtok_prompt[] = "New Password:"; + +/* + * OpenPAM extension + * + * Retrieve authentication token + */ + +int +pam_get_authtok(pam_handle_t *pamh, + int item, + const char **authtok, + const char *prompt) +{ + const void *oldauthtok, *prevauthtok, *promptp; + const char *default_prompt; + char *resp, *resp2; + int pitem, r, style, twice; + + ENTER(); + if (pamh == NULL || authtok == NULL) + RETURNC(PAM_SYSTEM_ERR); + *authtok = NULL; + twice = 0; + switch (item) { + case PAM_AUTHTOK: + pitem = PAM_AUTHTOK_PROMPT; + default_prompt = authtok_prompt; + r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok); + if (r == PAM_SUCCESS && oldauthtok != NULL) { + default_prompt = newauthtok_prompt; + twice = 1; + } + break; + case PAM_OLDAUTHTOK: + pitem = PAM_OLDAUTHTOK_PROMPT; + default_prompt = oldauthtok_prompt; + twice = 0; + break; + default: + RETURNC(PAM_SYMBOL_ERR); + } + if (openpam_get_option(pamh, "try_first_pass") || + openpam_get_option(pamh, "use_first_pass")) { + r = pam_get_item(pamh, item, &prevauthtok); + if (r == PAM_SUCCESS && prevauthtok != NULL) { + *authtok = prevauthtok; + RETURNC(PAM_SUCCESS); + } + else if (openpam_get_option(pamh, "use_first_pass")) + RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r); + } + if (prompt == NULL) { + r = pam_get_item(pamh, pitem, &promptp); + if (r != PAM_SUCCESS || promptp == NULL) + prompt = default_prompt; + else + prompt = promptp; + } + style = openpam_get_option(pamh, "echo_pass") ? + PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF; + r = pam_prompt(pamh, style, &resp, "%s", prompt); + if (r != PAM_SUCCESS) + RETURNC(r); + if (twice) { + r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt); + if (r != PAM_SUCCESS) { + FREE(resp); + RETURNC(r); + } + if (strcmp(resp, resp2) != 0) + FREE(resp); + FREE(resp2); + } + if (resp == NULL) + RETURNC(PAM_TRY_AGAIN); + r = pam_set_item(pamh, item, resp); + FREE(resp); + if (r != PAM_SUCCESS) + RETURNC(r); + r = pam_get_item(pamh, item, (const void **)authtok); + RETURNC(r); +} + +/* + * Error codes: + * + * =pam_get_item + * =pam_prompt + * =pam_set_item + * !PAM_SYMBOL_ERR + * PAM_TRY_AGAIN + */ + +/** + * The =pam_get_authtok function returns the cached authentication token, + * or prompts the user if no token is currently cached. + * Either way, a pointer to the authentication token is stored in the + * location pointed to by the =authtok argument. + * + * The =item argument must have one of the following values: + * + * =PAM_AUTHTOK: + * Returns the current authentication token, or the new token + * when changing authentication tokens. + * =PAM_OLDAUTHTOK: + * Returns the previous authentication token when changing + * authentication tokens. + * + * The =prompt argument specifies a prompt to use if no token is cached. + * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item, + * as appropriate, will be used. + * If that item is also =NULL, a hardcoded default prompt will be used. + * + * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK + * item, =pam_get_authtok will ask the user to confirm the new token by + * retyping it. + * If there is a mismatch, =pam_get_authtok will return =PAM_TRY_AGAIN. + * + * >pam_get_item + * >pam_get_user + */ |
