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/* trustlist.c - Maintain the list of trusted keys
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* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "agent.h"
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#include "../assuan/assuan.h" /* fixme: need a way to avoid assuan
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calls here */
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static const char headerblurb[] =
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"# This is the list of trusted keys. Comments like this one and empty\n"
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"# lines are allowed but keep in mind that the entire file is integrity\n"
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"# protected by the use of a MAC, so changing the file does not make\n"
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"# much sense without the knowledge of the MAC key. Lines do have a\n"
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"# length limit but this is not serious limitation as the format of the\n"
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"# entries is fixed and checked by gpg-agent: A non-comment line starts\n"
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"# with optional white spaces, followed by exactly 40 hex character,\n"
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"# optioanlly followed by a flag character which my either be 'P', 'S'\n"
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"# or '*'. Additional data delimited with by a white space is ignored.\n"
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"\n";
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static FILE *trustfp;
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static int
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open_list (int append)
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{
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char *fname;
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fname = make_filename (opt.homedir, "trustlist.txt", NULL);
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trustfp = fopen (fname, append? "a+":"r");
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if (!trustfp && errno == ENOENT)
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{
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trustfp = fopen (fname, "wx");
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if (!trustfp)
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{
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log_error ("can't create `%s': %s\n", fname, strerror (errno));
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xfree (fname);
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return seterr (File_Create_Error);
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}
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fputs (headerblurb, trustfp);
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fclose (trustfp);
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trustfp = fopen (fname, append? "a+":"r");
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}
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if (!trustfp)
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{
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log_error ("can't open `%s': %s\n", fname, strerror (errno));
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xfree (fname);
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return seterr (File_Open_Error);
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}
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/*FIXME: check the MAC */
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return 0;
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}
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/* Read the trustlist and return entry by entry. KEY must point to a
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buffer of at least 41 characters. KEYFLAG does return either 'P',
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'S' or '*'.
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Reading a valid entry return 0, EOF returns -1 any other error
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returns the appropriate error code. */
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static int
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read_list (char *key, int *keyflag)
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{
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int rc;
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int c, i;
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char *p, line[256];
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if (!trustfp)
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{
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rc = open_list (0);
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if (rc)
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return rc;
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}
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do
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{
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if (!fgets (line, DIM(line)-1, trustfp) )
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{
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if (feof (trustfp))
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return -1;
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return GNUPG_Read_Error;
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}
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if (!*line || line[strlen(line)-1] != '\n')
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{
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/* eat until end of line */
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while ( (c=getc (trustfp)) != EOF && c != '\n')
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;
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return *line? GNUPG_Line_Too_Long: GNUPG_Incomplete_Line;
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}
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/* Allow for emty lines and spaces */
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for (p=line; spacep (p); p++)
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;
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}
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while (!*p || *p == '\n' || *p == '#');
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for (i=0; hexdigitp (p+i) && i < 40; i++)
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key[i] = p[i] >= 'a'? (p[i] & 0xdf): p[i];
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key[i] = 0;
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if (i!=40 || !(spacep (p+i) || p[i] == '\n'))
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{
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log_error ("invalid formatted fingerprint in trustlist\n");
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return GNUPG_Bad_Data;
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}
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assert (p[i]);
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if (p[i] == '\n')
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*keyflag = '*';
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else
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{
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i++;
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if ( p[i] == 'P' || p[i] == 'p')
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*keyflag = 'P';
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else if ( p[i] == 'S' || p[i] == 's')
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*keyflag = 'S';
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else if ( p[i] == '*')
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*keyflag = '*';
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else
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{
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log_error ("invalid keyflag in trustlist\n");
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return GNUPG_Bad_Data;
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}
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i++;
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if ( !(spacep (p+i) || p[i] == '\n'))
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{
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log_error ("invalid keyflag in trustlist\n");
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return GNUPG_Bad_Data;
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}
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}
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return 0;
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}
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/* check whether the given fpr is in our trustdb. We expect FPR to be
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an all uppercase hexstring of 40 characters. */
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int
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agent_istrusted (const char *fpr)
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{
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int rc;
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static char key[41];
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int keyflag;
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if (trustfp)
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rewind (trustfp);
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while (!(rc=read_list (key, &keyflag)))
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{
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if (!strcmp (key, fpr))
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return 0;
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}
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if (rc != -1)
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{
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/* error in the trustdb - close it to give the user a chance for
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correction */
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fclose (trustfp);
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trustfp = NULL;
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}
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return rc;
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}
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/* write all trust entries to FP */
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int
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agent_listtrusted (void *assuan_context)
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{
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int rc;
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static char key[51];
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int keyflag;
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if (trustfp)
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rewind (trustfp);
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while (!(rc=read_list (key, &keyflag)))
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{
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key[40] = ' ';
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key[41] = keyflag;
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key[42] = '\n';
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assuan_send_data (assuan_context, key, 43);
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assuan_send_data (assuan_context, NULL, 0); /* flush */
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}
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if (rc == -1)
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rc = 0;
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if (rc)
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{
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/* error in the trustdb - close it to give the user a chance for
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correction */
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fclose (trustfp);
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trustfp = NULL;
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}
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return rc;
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}
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/* Insert the given fpr into our trustdb. We expect FPR to be an all
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uppercase hexstring of 40 characters. FLAG is either 'P' or 'C'.
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This function does first check whether that key has alreay ben put
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into the trustdb and returns success in this case. Before a FPR
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actually gets inserted, the user is asked by means of the pin-entry
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whether this is actual wants he want to do.
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*/
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int
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agent_marktrusted (const char *name, const char *fpr, int flag)
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{
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int rc;
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static char key[41];
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int keyflag;
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char *desc;
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if (trustfp)
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rewind (trustfp);
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while (!(rc=read_list (key, &keyflag)))
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{
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if (!strcmp (key, fpr))
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return 0;
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}
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fclose (trustfp);
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trustfp = NULL;
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if (rc != -1)
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return rc; /* error in the trustdb */
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/* insert a new one */
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if (asprintf (&desc,
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"Please verify that the certificate identified as:%%0A"
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" \"%s\"%%0A"
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"has the fingerprint:%%0A"
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" %s", name, fpr) < 0 )
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return GNUPG_Out_Of_Core;
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rc = agent_get_confirmation (desc, "Correct", "No");
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free (desc);
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if (rc)
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return rc;
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if (asprintf (&desc,
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"Do you ultimately trust%%0A"
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" \"%s\"%%0A"
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"to correctly certify user certificates?",
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name) < 0 )
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return GNUPG_Out_Of_Core;
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rc = agent_get_confirmation (desc, "Yes", "No");
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free (desc);
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if (rc)
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return rc;
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/* now check again to avoid duplicates. Also open in append mode now */
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rc = open_list (1);
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if (rc)
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return rc;
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rewind (trustfp);
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while (!(rc=read_list (key, &keyflag)))
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{
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if (!strcmp (key, fpr))
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return 0;
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}
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if (rc != -1)
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{
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fclose (trustfp);
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trustfp = NULL;
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return rc; /* error in the trustdb */
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}
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rc = 0;
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/* append the key */
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fflush (trustfp);
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fputs ("\n# ", trustfp);
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print_sanitized_string (trustfp, name, 0);
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fprintf (trustfp, "\n%s %c\n", fpr, flag);
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if (ferror (trustfp))
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rc = GNUPG_Write_Error;
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/* close because we are in append mode */
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if (fclose (trustfp))
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rc = GNUPG_File_Error;
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trustfp = NULL;
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return rc;
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}
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