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sudo 1.8.5p1

    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: #include "sudo_plugin_int.h"
   51: 
   52: extern int tgetpass_flags; /* XXX */
   53: 
   54: #if defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)
   55: sudo_conv_t sudo_conv;	/* NULL in sudo front-end */
   56: #endif
   57: 
   58: /*
   59:  * Sudo conversation function.
   60:  */
   61: int
   62: sudo_conversation(int num_msgs, const struct sudo_conv_message msgs[],
   63:     struct sudo_conv_reply replies[])
   64: {
   65:     struct sudo_conv_reply *repl;
   66:     const struct sudo_conv_message *msg;
   67:     char *pass;
   68:     int n, flags = tgetpass_flags;
   69: 
   70:     for (n = 0; n < num_msgs; n++) {
   71: 	msg = &msgs[n];
   72: 	repl = &replies[n];
   73: 	switch (msg->msg_type & 0xff) {
   74: 	    case SUDO_CONV_PROMPT_ECHO_ON:
   75: 	    case SUDO_CONV_PROMPT_MASK:
   76: 		if (msg->msg_type == SUDO_CONV_PROMPT_ECHO_ON)
   77: 		    SET(flags, TGP_ECHO);
   78: 		else
   79: 		    SET(flags, TGP_MASK);
   80: 		/* FALLTHROUGH */
   81: 	    case SUDO_CONV_PROMPT_ECHO_OFF:
   82: 		if (ISSET(msg->msg_type, SUDO_CONV_PROMPT_ECHO_OK))
   83: 		    SET(flags, TGP_NOECHO_TRY);
   84: 		/* Read the password unless interrupted. */
   85: 		pass = tgetpass(msg->msg, msg->timeout, flags);
   86: 		if (pass == NULL)
   87: 		    goto err;
   88: 		repl->reply = estrdup(pass);
   89: 		zero_bytes(pass, strlen(pass));
   90: 		break;
   91: 	    case SUDO_CONV_INFO_MSG:
   92: 		if (msg->msg)
   93: 		    (void) fputs(msg->msg, stdout);
   94: 		break;
   95: 	    case SUDO_CONV_ERROR_MSG:
   96: 		if (msg->msg)
   97: 		    (void) fputs(msg->msg, stderr);
   98: 		break;
   99: 	    case SUDO_CONV_DEBUG_MSG:
  100: 		if (msg->msg)
  101: 		    sudo_debug_write(msg->msg, strlen(msg->msg), 0);
  102: 		break;
  103: 	    default:
  104: 		goto err;
  105: 	}
  106:     }
  107: 
  108:     return 0;
  109: 
  110: err:
  111:     /* Zero and free allocated memory and return an error. */
  112:     do {
  113: 	repl = &replies[n];
  114: 	if (repl->reply != NULL) {
  115: 	    zero_bytes(repl->reply, strlen(repl->reply));
  116: 	    free(repl->reply);
  117: 	    repl->reply = NULL;
  118: 	}
  119:     } while (n--);
  120: 
  121:     return -1;
  122: }
  123: 
  124: int
  125: _sudo_printf(int msg_type, const char *fmt, ...)
  126: {
  127:     va_list ap;
  128:     FILE *fp;
  129:     int len;
  130: 
  131:     switch (msg_type) {
  132:     case SUDO_CONV_INFO_MSG:
  133: 	fp = stdout;
  134: 	break;
  135:     case SUDO_CONV_ERROR_MSG:
  136: 	fp = stderr;
  137: 	break;
  138:     default:
  139: 	errno = EINVAL;
  140: 	return -1;
  141:     }
  142: 
  143:     va_start(ap, fmt);
  144:     len = vfprintf(fp, fmt, ap);
  145:     va_end(ap);
  146: 
  147:     return len;
  148: }