mirror of
git://git.gnupg.org/gnupg.git
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527 lines
12 KiB
C
527 lines
12 KiB
C
/* ksutil.c - general keyserver utility functions
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* Copyright (C) 2004, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include <config.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef HAVE_LIBCURL
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#include <curl/curl.h>
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#else
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#ifdef FAKE_CURL
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#include "curl-shim.h"
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#endif
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#endif
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#include "keyserver.h"
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#include "ksutil.h"
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#ifdef HAVE_DOSISH_SYSTEM
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unsigned int set_timeout(unsigned int seconds) {return 0;}
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int register_timeout(void) {return 0;}
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#else
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static void
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catch_alarm(int foo)
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{
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(void)foo;
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_exit(KEYSERVER_TIMEOUT);
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}
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unsigned int
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set_timeout(unsigned int seconds)
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{
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return alarm(seconds);
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}
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int
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register_timeout(void)
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{
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#if defined(HAVE_SIGACTION) && defined(HAVE_STRUCT_SIGACTION)
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struct sigaction act;
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act.sa_handler=catch_alarm;
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sigemptyset(&act.sa_mask);
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act.sa_flags=0;
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return sigaction(SIGALRM,&act,NULL);
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#else
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if(signal(SIGALRM,catch_alarm)==SIG_ERR)
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return -1;
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else
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return 0;
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#endif
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}
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#endif /* !HAVE_DOSISH_SYSTEM */
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struct ks_options *
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init_ks_options(void)
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{
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struct ks_options *opt;
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opt=calloc(1,sizeof(struct ks_options));
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if(opt)
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{
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opt->action=KS_UNKNOWN;
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opt->flags.include_revoked=1;
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opt->flags.include_subkeys=1;
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opt->flags.check_cert=1;
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opt->timeout=DEFAULT_KEYSERVER_TIMEOUT;
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opt->path=strdup("/");
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if(!opt->path)
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{
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free(opt);
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opt=NULL;
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}
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}
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return opt;
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}
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void
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free_ks_options(struct ks_options *opt)
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{
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if(opt)
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{
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free(opt->host);
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free(opt->port);
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free(opt->scheme);
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free(opt->auth);
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free(opt->path);
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free(opt->opaque);
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free(opt->ca_cert_file);
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free(opt);
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}
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}
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/* Returns 0 if we "ate" the line. Returns >0, a KEYSERVER_ error
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code if that error applies. Returns -1 if we did not match the
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line at all. */
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int
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parse_ks_options(char *line,struct ks_options *opt)
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{
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int version;
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char command[MAX_COMMAND+1];
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char host[MAX_HOST+1];
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char port[MAX_PORT+1];
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char scheme[MAX_SCHEME+1];
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char auth[MAX_AUTH+1];
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char path[URLMAX_PATH+1];
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char opaque[MAX_OPAQUE+1];
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char option[MAX_OPTION+1];
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if(line[0]=='#')
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return 0;
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if(sscanf(line,"COMMAND %" MKSTRING(MAX_COMMAND) "s\n",command)==1)
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{
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command[MAX_COMMAND]='\0';
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if(strcasecmp(command,"get")==0)
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opt->action=KS_GET;
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else if(strcasecmp(command,"getname")==0)
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opt->action=KS_GETNAME;
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else if(strcasecmp(command,"send")==0)
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opt->action=KS_SEND;
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else if(strcasecmp(command,"search")==0)
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opt->action=KS_SEARCH;
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return 0;
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}
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if(sscanf(line,"HOST %" MKSTRING(MAX_HOST) "s\n",host)==1)
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{
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host[MAX_HOST]='\0';
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free(opt->host);
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opt->host=strdup(host);
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if(!opt->host)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"PORT %" MKSTRING(MAX_PORT) "s\n",port)==1)
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{
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port[MAX_PORT]='\0';
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free(opt->port);
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opt->port=strdup(port);
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if(!opt->port)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"SCHEME %" MKSTRING(MAX_SCHEME) "s\n",scheme)==1)
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{
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scheme[MAX_SCHEME]='\0';
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free(opt->scheme);
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opt->scheme=strdup(scheme);
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if(!opt->scheme)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"AUTH %" MKSTRING(MAX_AUTH) "s\n",auth)==1)
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{
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auth[MAX_AUTH]='\0';
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free(opt->auth);
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opt->auth=strdup(auth);
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if(!opt->auth)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"PATH %" MKSTRING(URLMAX_PATH) "s\n",path)==1)
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{
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path[URLMAX_PATH]='\0';
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free(opt->path);
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opt->path=strdup(path);
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if(!opt->path)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"OPAQUE %" MKSTRING(MAX_OPAQUE) "s\n",opaque)==1)
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{
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opaque[MAX_OPAQUE]='\0';
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free(opt->opaque);
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opt->opaque=strdup(opaque);
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if(!opt->opaque)
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return KEYSERVER_NO_MEMORY;
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return 0;
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}
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if(sscanf(line,"VERSION %d\n",&version)==1)
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{
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if(version!=KEYSERVER_PROTO_VERSION)
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return KEYSERVER_VERSION_ERROR;
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return 0;
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}
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if(sscanf(line,"OPTION %" MKSTRING(MAX_OPTION) "[^\n]\n",option)==1)
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{
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int no=0;
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char *start=&option[0];
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option[MAX_OPTION]='\0';
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if(strncasecmp(option,"no-",3)==0)
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{
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no=1;
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start=&option[3];
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}
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if(strncasecmp(start,"verbose",7)==0)
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{
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if(no)
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opt->verbose=0;
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else if(start[7]=='=')
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opt->verbose=atoi(&start[8]);
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else
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opt->verbose++;
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}
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else if(strcasecmp(start,"include-disabled")==0)
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{
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if(no)
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opt->flags.include_disabled=0;
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else
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opt->flags.include_disabled=1;
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}
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else if(strcasecmp(start,"include-revoked")==0)
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{
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if(no)
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opt->flags.include_revoked=0;
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else
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opt->flags.include_revoked=1;
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}
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else if(strcasecmp(start,"include-subkeys")==0)
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{
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if(no)
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opt->flags.include_subkeys=0;
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else
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opt->flags.include_subkeys=1;
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}
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else if(strcasecmp(start,"check-cert")==0)
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{
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if(no)
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opt->flags.check_cert=0;
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else
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opt->flags.check_cert=1;
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}
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else if(strncasecmp(start,"debug",5)==0)
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{
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if(no)
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opt->debug=0;
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else if(start[5]=='=')
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opt->debug=atoi(&start[6]);
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else if(start[5]=='\0')
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opt->debug=1;
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}
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else if(strncasecmp(start,"timeout",7)==0)
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{
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if(no)
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opt->timeout=0;
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else if(start[7]=='=')
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opt->timeout=atoi(&start[8]);
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else if(start[7]=='\0')
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opt->timeout=DEFAULT_KEYSERVER_TIMEOUT;
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}
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else if(strncasecmp(start,"ca-cert-file",12)==0)
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{
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if(no)
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{
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free(opt->ca_cert_file);
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opt->ca_cert_file=NULL;
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}
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else if(start[12]=='=')
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{
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free(opt->ca_cert_file);
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opt->ca_cert_file=strdup(&start[13]);
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if(!opt->ca_cert_file)
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return KEYSERVER_NO_MEMORY;
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}
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}
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}
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return -1;
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}
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const char *
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ks_action_to_string(enum ks_action action)
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{
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switch(action)
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{
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case KS_UNKNOWN: return "UNKNOWN";
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case KS_GET: return "GET";
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case KS_GETNAME: return "GETNAME";
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case KS_SEND: return "SEND";
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case KS_SEARCH: return "SEARCH";
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}
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return "?";
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}
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/* Canonicalize CRLF to just LF by stripping CRs. This actually makes
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sense, since on Unix-like machines LF is correct, and on win32-like
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machines, our output buffer is opened in textmode and will
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re-canonicalize line endings back to CRLF. Since we only need to
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handle armored keys, we don't have to worry about odd cases like
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CRCRCR and the like. */
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void
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print_nocr(FILE *stream,const char *str)
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{
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while(*str)
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{
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if(*str!='\r')
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fputc(*str,stream);
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str++;
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}
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}
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enum ks_search_type
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classify_ks_search(const char **search)
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{
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switch(**search)
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{
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default:
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return KS_SEARCH_SUBSTR;
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case '*':
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(*search)++;
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return KS_SEARCH_SUBSTR;
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case '=':
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(*search)++;
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return KS_SEARCH_EXACT;
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case '<':
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return KS_SEARCH_MAIL;
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case '@':
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(*search)++;
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return KS_SEARCH_MAILSUB;
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}
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}
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#if defined (HAVE_LIBCURL) || defined (FAKE_CURL)
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int
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curl_err_to_gpg_err(CURLcode error)
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{
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switch(error)
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{
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case CURLE_OK: return KEYSERVER_OK;
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case CURLE_UNSUPPORTED_PROTOCOL: return KEYSERVER_SCHEME_NOT_FOUND;
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case CURLE_COULDNT_CONNECT: return KEYSERVER_UNREACHABLE;
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case CURLE_FTP_COULDNT_RETR_FILE: return KEYSERVER_KEY_NOT_FOUND;
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default: return KEYSERVER_INTERNAL_ERROR;
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}
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}
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#define B64 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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static void
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curl_armor_writer(const unsigned char *buf,size_t size,void *cw_ctx)
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{
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struct curl_writer_ctx *ctx=cw_ctx;
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size_t idx=0;
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while(idx<size)
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{
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for(;ctx->armor_remaining<3 && idx<size;ctx->armor_remaining++,idx++)
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ctx->armor_ctx[ctx->armor_remaining]=buf[idx];
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if(ctx->armor_remaining==3)
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{
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/* Top 6 bytes of ctx->armor_ctx[0] */
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fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
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/* Bottom 2 bytes of ctx->armor_ctx[0] and top 4 bytes of
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ctx->armor_ctx[1] */
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fputc(B64[(((ctx->armor_ctx[0]<<4)&0x30)
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|((ctx->armor_ctx[1]>>4)&0x0F))&0x3F],ctx->stream);
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/* Bottom 4 bytes of ctx->armor_ctx[1] and top 2 bytes of
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ctx->armor_ctx[2] */
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fputc(B64[(((ctx->armor_ctx[1]<<2)&0x3C)
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|((ctx->armor_ctx[2]>>6)&0x03))&0x3F],ctx->stream);
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/* Bottom 6 bytes of ctx->armor_ctx[2] */
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fputc(B64[(ctx->armor_ctx[2]&0x3F)],ctx->stream);
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ctx->linelen+=4;
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if(ctx->linelen>=70)
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{
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fputc('\n',ctx->stream);
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ctx->linelen=0;
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}
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ctx->armor_remaining=0;
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}
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}
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}
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size_t
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curl_writer(const void *ptr,size_t size,size_t nmemb,void *cw_ctx)
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{
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struct curl_writer_ctx *ctx=cw_ctx;
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const char *buf=ptr;
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size_t i;
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if(!ctx->flags.initialized)
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{
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if(size*nmemb==0)
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return 0;
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/* The object we're fetching is in binary form */
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if(*buf&0x80)
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{
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ctx->flags.armor=1;
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fprintf(ctx->stream,BEGIN"\n\n");
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}
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else
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ctx->marker=BEGIN;
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ctx->flags.initialized=1;
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}
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if(ctx->flags.armor)
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curl_armor_writer(ptr,size*nmemb,cw_ctx);
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else
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{
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/* scan the incoming data for our marker */
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for(i=0;!ctx->flags.done && i<(size*nmemb);i++)
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{
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if(buf[i]==ctx->marker[ctx->markeridx])
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{
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ctx->markeridx++;
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if(ctx->marker[ctx->markeridx]=='\0')
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{
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if(ctx->flags.begun)
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ctx->flags.done=1;
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else
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{
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/* We've found the BEGIN marker, so now we're
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looking for the END marker. */
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ctx->flags.begun=1;
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ctx->marker=END;
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ctx->markeridx=0;
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fprintf(ctx->stream,BEGIN);
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continue;
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}
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}
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}
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else
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ctx->markeridx=0;
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if(ctx->flags.begun)
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{
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/* Canonicalize CRLF to just LF by stripping CRs. This
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actually makes sense, since on Unix-like machines LF
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is correct, and on win32-like machines, our output
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buffer is opened in textmode and will re-canonicalize
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line endings back to CRLF. Since this code is just
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for handling armored keys, we don't have to worry
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about odd cases like CRCRCR and the like. */
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if(buf[i]!='\r')
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fputc(buf[i],ctx->stream);
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}
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}
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}
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return size*nmemb;
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}
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void
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curl_writer_finalize(struct curl_writer_ctx *ctx)
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{
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if(ctx->flags.armor)
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{
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if(ctx->armor_remaining==2)
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{
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/* Top 6 bytes of ctx->armorctx[0] */
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fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
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/* Bottom 2 bytes of ctx->armor_ctx[0] and top 4 bytes of
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ctx->armor_ctx[1] */
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fputc(B64[(((ctx->armor_ctx[0]<<4)&0x30)
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|((ctx->armor_ctx[1]>>4)&0x0F))&0x3F],ctx->stream);
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/* Bottom 4 bytes of ctx->armor_ctx[1] */
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fputc(B64[((ctx->armor_ctx[1]<<2)&0x3C)],ctx->stream);
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/* Pad */
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fputc('=',ctx->stream);
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}
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else if(ctx->armor_remaining==1)
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{
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/* Top 6 bytes of ctx->armor_ctx[0] */
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fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
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/* Bottom 2 bytes of ctx->armor_ctx[0] */
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fputc(B64[((ctx->armor_ctx[0]<<4)&0x30)],ctx->stream);
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/* Pad */
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fputc('=',ctx->stream);
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/* Pad */
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fputc('=',ctx->stream);
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}
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fprintf(ctx->stream,"\n"END);
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ctx->flags.done=1;
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}
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}
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#endif
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