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sudo

    1: /*
    2:  * Copyright (c) 1999-2005, 2007-2010 Todd C. Miller <Todd.Miller@courtesan.com>
    3:  *
    4:  * Permission to use, copy, modify, and distribute this software for any
    5:  * purpose with or without fee is hereby granted, provided that the above
    6:  * copyright notice and this permission notice appear in all copies.
    7:  *
    8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15:  *
   16:  * Sponsored in part by the Defense Advanced Research Projects
   17:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
   18:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
   19:  */
   20: 
   21: #include <config.h>
   22: 
   23: #include <sys/types.h>
   24: #include <sys/param.h>
   25: #include <stdio.h>
   26: #ifdef STDC_HEADERS
   27: # include <stdlib.h>
   28: # include <stddef.h>
   29: #else
   30: # ifdef HAVE_STDLIB_H
   31: #  include <stdlib.h>
   32: # endif
   33: #endif /* STDC_HEADERS */
   34: #ifdef HAVE_STRING_H
   35: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
   36: #  include <memory.h>
   37: # endif
   38: # include <string.h>
   39: #endif /* HAVE_STRING_H */
   40: #ifdef HAVE_STRINGS_H
   41: # include <strings.h>
   42: #endif /* HAVE_STRINGS_H */
   43: #ifdef HAVE_UNISTD_H
   44: # include <unistd.h>
   45: #endif /* HAVE_UNISTD_H */
   46: #include <errno.h>
   47: 
   48: #include "sudo.h"
   49: #include "sudo_plugin.h"
   50: 
   51: extern int tgetpass_flags; /* XXX */
   52: 
   53: /*
   54:  * Sudo conversation function.
   55:  */
   56: int
   57: sudo_conversation(int num_msgs, const struct sudo_conv_message msgs[],
   58:     struct sudo_conv_reply replies[])
   59: {
   60:     struct sudo_conv_reply *repl;
   61:     const struct sudo_conv_message *msg;
   62:     char *pass;
   63:     int n, flags = tgetpass_flags;
   64: 
   65:     for (n = 0; n < num_msgs; n++) {
   66: 	msg = &msgs[n];
   67: 	repl = &replies[n];
   68: 	switch (msg->msg_type & 0xff) {
   69: 	    case SUDO_CONV_PROMPT_ECHO_ON:
   70: 	    case SUDO_CONV_PROMPT_MASK:
   71: 		if (msg->msg_type == SUDO_CONV_PROMPT_ECHO_ON)
   72: 		    SET(flags, TGP_ECHO);
   73: 		else
   74: 		    SET(flags, TGP_MASK);
   75: 		/* FALLTHROUGH */
   76: 	    case SUDO_CONV_PROMPT_ECHO_OFF:
   77: 		if (ISSET(msg->msg_type, SUDO_CONV_PROMPT_ECHO_OK))
   78: 		    SET(flags, TGP_NOECHO_TRY);
   79: 		/* Read the password unless interrupted. */
   80: 		pass = tgetpass(msg->msg, msg->timeout, flags);
   81: 		if (pass == NULL)
   82: 		    goto err;
   83: 		repl->reply = estrdup(pass);
   84: 		zero_bytes(pass, strlen(pass));
   85: 		break;
   86: 	    case SUDO_CONV_INFO_MSG:
   87: 		if (msg->msg)
   88: 		    (void) fputs(msg->msg, stdout);
   89: 		break;
   90: 	    case SUDO_CONV_ERROR_MSG:
   91: 		if (msg->msg)
   92: 		    (void) fputs(msg->msg, stderr);
   93: 		break;
   94: 	    default:
   95: 		goto err;
   96: 	}
   97:     }
   98: 
   99:     return 0;
  100: 
  101: err:
  102:     /* Zero and free allocated memory and return an error. */
  103:     do {
  104: 	repl = &replies[n];
  105: 	if (repl->reply != NULL) {
  106: 	    zero_bytes(repl->reply, strlen(repl->reply));
  107: 	    free(repl->reply);
  108: 	    repl->reply = NULL;
  109: 	}
  110:     } while (n--);
  111: 
  112:     return -1;
  113: }
  114: 
  115: int
  116: _sudo_printf(int msg_type, const char *fmt, ...)
  117: {
  118:     va_list ap;
  119:     FILE *fp;
  120:     int len;
  121: 
  122:     switch (msg_type) {
  123:     case SUDO_CONV_INFO_MSG:
  124: 	fp = stdout;
  125: 	break;
  126:     case SUDO_CONV_ERROR_MSG:
  127: 	fp = stderr;
  128: 	break;
  129:     default:
  130: 	errno = EINVAL;
  131: 	return -1;
  132:     }
  133: 
  134:     va_start(ap, fmt);
  135:     len = vfprintf(fp, fmt, ap);
  136:     va_end(ap);
  137: 
  138:     return len;
  139: }