diff options
Diffstat (limited to 'contrib/openpam/lib/libpam/pam_get_authtok.c')
| -rw-r--r-- | contrib/openpam/lib/libpam/pam_get_authtok.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/contrib/openpam/lib/libpam/pam_get_authtok.c b/contrib/openpam/lib/libpam/pam_get_authtok.c new file mode 100644 index 0000000..a062934 --- /dev/null +++ b/contrib/openpam/lib/libpam/pam_get_authtok.c @@ -0,0 +1,234 @@ +/*- + * Copyright (c) 2002-2003 Networks Associates Technology, Inc. + * Copyright (c) 2004-2011 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 670 2013-03-17 19:26:07Z des $ + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#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 authtok_prompt_remote[] = "Password for %u@%h:"; +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) +{ + char prompt_buf[1024]; + size_t prompt_size; + const void *oldauthtok, *prevauthtok, *promptp; + const char *prompt_option, *default_prompt; + const void *lhost, *rhost; + 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; + prompt_option = "authtok_prompt"; + default_prompt = authtok_prompt; + r = pam_get_item(pamh, PAM_RHOST, &rhost); + if (r == PAM_SUCCESS && rhost != NULL) { + r = pam_get_item(pamh, PAM_HOST, &lhost); + if (r == PAM_SUCCESS && lhost != NULL) { + if (strcmp(rhost, lhost) != 0) + default_prompt = authtok_prompt_remote; + } + } + 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; + prompt_option = "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); + } + } + /* pam policy overrides the module's choice */ + if ((promptp = openpam_get_option(pamh, prompt_option)) != NULL) + prompt = promptp; + /* no prompt provided, see if there is one tucked away somewhere */ + if (prompt == NULL) + if (pam_get_item(pamh, pitem, &promptp) && promptp != NULL) + prompt = promptp; + /* fall back to hardcoded default */ + if (prompt == NULL) + prompt = default_prompt; + /* expand */ + prompt_size = sizeof prompt_buf; + r = openpam_subst(pamh, prompt_buf, &prompt_size, prompt); + if (r == PAM_SUCCESS && prompt_size <= sizeof prompt_buf) + prompt = prompt_buf; + 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 either prompts the user for an + * authentication token or retrieves a cached authentication token, + * depending on circumstances. + * Either way, a pointer to the authentication token is stored in the + * location pointed to by the =authtok argument, and the corresponding PAM + * item is updated. + * + * 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. + * Additionally, when =pam_get_authtok is called from a service module, + * the prompt may be affected by module options as described below. + * The prompt is then expanded using =openpam_subst before it is passed to + * the conversation function. + * + * 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. + * + * MODULE OPTIONS + * + * When called by a service module, =pam_get_authtok will recognize the + * following module options: + * + * ;authtok_prompt: + * Prompt to use when =item is set to =PAM_AUTHTOK. + * This option overrides both the =prompt argument and the + * =PAM_AUTHTOK_PROMPT item. + * ;echo_pass: + * If the application's conversation function allows it, this + * lets the user see what they are typing. + * This should only be used for non-reusable authentication + * tokens. + * ;oldauthtok_prompt: + * Prompt to use when =item is set to =PAM_OLDAUTHTOK. + * This option overrides both the =prompt argument and the + * =PAM_OLDAUTHTOK_PROMPT item. + * ;try_first_pass: + * If the requested item is non-null, return it without + * prompting the user. + * Typically, the service module will verify the token, and + * if it does not match, clear the item before calling + * =pam_get_authtok a second time. + * ;use_first_pass: + * Do not prompt the user at all; just return the cached + * value, or =PAM_AUTH_ERR if there is none. + * + * >pam_conv + * >pam_get_item + * >pam_get_user + * >openpam_get_option + * >openpam_subst + */ |
