contrib/openpam/lib/pam_vprompt.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by ThinkSec AS and
   6  * Network Associates Laboratories, the Security Research Division of
   7  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   8  * ("CBOSS"), as part of the DARPA CHATS research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $P4: //depot/projects/openpam/lib/pam_vprompt.c#13 $
  35  */
  36
  37 #include <stdarg.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40
  41 #include <security/pam_appl.h>
  42
  43 #include "openpam_impl.h"
  44
  45 /*
  46  * OpenPAM extension
  47  *
  48  * Call the conversation function
  49  */
  50
  51 int
  52 pam_vprompt(pam_handle_t *pamh,
  53         int style,
  54         char **resp,
  55         const char *fmt,
  56         va_list ap)
  57 {
  58         char msgbuf[PAM_MAX_MSG_SIZE];
  59         struct pam_message msg;
  60         const struct pam_message *msgp;
  61         struct pam_response *rsp;
  62         const struct pam_conv *conv;
  63         const void *convp;
  64         int r;
  65
  66         ENTER();
  67         r = pam_get_item(pamh, PAM_CONV, &convp);
  68         if (r != PAM_SUCCESS)
  69                 RETURNC(r);
  70         conv = convp;
  71         if (conv == NULL || conv->conv == NULL) {
  72                 openpam_log(PAM_LOG_ERROR, "no conversation function");
  73                 RETURNC(PAM_SYSTEM_ERR);
  74         }
  75         vsnprintf(msgbuf, PAM_MAX_MSG_SIZE, fmt, ap);
  76         msg.msg_style = style;
  77         msg.msg = msgbuf;
  78         msgp = &msg;
  79         rsp = NULL;
  80         r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr);
  81         *resp = rsp == NULL ? NULL : rsp->resp;
  82         FREE(rsp);
  83         RETURNC(r);
  84 }
  85
  86 /*
  87  * Error codes:
  88  *
  89  *     !PAM_SYMBOL_ERR
  90  *      PAM_SYSTEM_ERR
  91  *      PAM_BUF_ERR
  92  *      PAM_CONV_ERR
  93  */
  94
  95 /**
  96  * The =pam_vprompt function constructs a string from the =fmt and =ap
  97  * arguments using =vsnprintf, and passes it to the given PAM context's
  98  * conversation function.
  99  *
 100  * The =style argument specifies the type of interaction requested, and
 101  * must be one of the following:
 102  *
 103  *      =PAM_PROMPT_ECHO_OFF:
 104  *              Display the message and obtain the user's response without
 105  *              displaying it.
 106  *      =PAM_PROMPT_ECHO_ON:
 107  *              Display the message and obtain the user's response.
 108  *      =PAM_ERROR_MSG:
 109  *              Display the message as an error message, and do not wait
 110  *              for a response.
 111  *      =PAM_TEXT_INFO:
 112  *              Display the message as an informational message, and do
 113  *              not wait for a response.
 114  *
 115  * A pointer to the response, or =NULL if the conversation function did
 116  * not return one, is stored in the location pointed to by the =resp
 117  * argument.
 118  *
 119  * The message and response should not exceed =PAM_MAX_MSG_SIZE or
 120  * =PAM_MAX_RESP_SIZE, respectively.
 121  * If they do, they may be truncated.
 122  *
 123  * >pam_error
 124  * >pam_info
 125  * >pam_prompt
 126  * >pam_verror
 127  * >pam_vinfo
 128  */