diff options
Diffstat (limited to 'contrib/openpam/lib/libpam/pam_get_user.c')
| -rw-r--r-- | contrib/openpam/lib/libpam/pam_get_user.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/contrib/openpam/lib/libpam/pam_get_user.c b/contrib/openpam/lib/libpam/pam_get_user.c new file mode 100644 index 0000000..2e22e0e --- /dev/null +++ b/contrib/openpam/lib/libpam/pam_get_user.c @@ -0,0 +1,146 @@ +/*- + * 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_user.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 <security/pam_appl.h> +#include <security/openpam.h> + +#include "openpam_impl.h" + +static const char user_prompt[] = "Login:"; + +/* + * XSSO 4.2.1 + * XSSO 6 page 52 + * + * Retrieve user name + */ + +int +pam_get_user(pam_handle_t *pamh, + const char **user, + const char *prompt) +{ + char prompt_buf[1024]; + size_t prompt_size; + const void *promptp; + char *resp; + int r; + + ENTER(); + if (pamh == NULL || user == NULL) + RETURNC(PAM_SYSTEM_ERR); + r = pam_get_item(pamh, PAM_USER, (const void **)user); + if (r == PAM_SUCCESS && *user != NULL) + RETURNC(PAM_SUCCESS); + /* pam policy overrides the module's choice */ + if ((promptp = openpam_get_option(pamh, "user_prompt")) != NULL) + prompt = promptp; + /* no prompt provided, see if there is one tucked away somewhere */ + if (prompt == NULL) + if (pam_get_item(pamh, PAM_USER_PROMPT, &promptp) && + promptp != NULL) + prompt = promptp; + /* fall back to hardcoded default */ + if (prompt == NULL) + prompt = user_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; + r = pam_prompt(pamh, PAM_PROMPT_ECHO_ON, &resp, "%s", prompt); + if (r != PAM_SUCCESS) + RETURNC(r); + r = pam_set_item(pamh, PAM_USER, resp); + FREE(resp); + if (r != PAM_SUCCESS) + RETURNC(r); + r = pam_get_item(pamh, PAM_USER, (const void **)user); + RETURNC(r); +} + +/* + * Error codes: + * + * =pam_get_item + * =pam_prompt + * =pam_set_item + * !PAM_SYMBOL_ERR + */ + +/** + * The =pam_get_user function returns the name of the target user, as + * specified to =pam_start. + * If no user was specified, nor set using =pam_set_item, =pam_get_user + * will prompt for a user name. + * Either way, a pointer to the user name is stored in the location + * pointed to by the =user argument, and the corresponding PAM item is + * updated. + * + * The =prompt argument specifies a prompt to use if no user name is + * cached. + * If it is =NULL, the =PAM_USER_PROMPT item will be used. + * If that item is also =NULL, a hardcoded default prompt will be used. + * Additionally, when =pam_get_user 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. + * + * MODULE OPTIONS + * + * When called by a service module, =pam_get_user will recognize the + * following module options: + * + * ;user_prompt: + * Prompt to use when asking for the user name. + * This option overrides both the =prompt argument and the + * =PAM_USER_PROMPT item. + * + * >pam_conv + * >pam_get_item + * >pam_get_authtok + * >openpam_get_option + * >openpam_subst + */ |
