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gnupg/keyserver/ksutil.c

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/* ksutil.c - general keyserver utility functions
* Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#else
#include "curl-shim.h"
#endif
#include "keyserver.h"
#include "ksutil.h"
#ifdef HAVE_DOSISH_SYSTEM
unsigned int set_timeout(unsigned int seconds) {return 0;}
int register_timeout(void) {return 0;}
#else
static void
catch_alarm(int foo)
{
(void)foo;
_exit(KEYSERVER_TIMEOUT);
}
unsigned int
set_timeout(unsigned int seconds)
{
return alarm(seconds);
}
int
register_timeout(void)
{
#if defined(HAVE_SIGACTION) && defined(HAVE_STRUCT_SIGACTION)
struct sigaction act;
act.sa_handler=catch_alarm;
sigemptyset(&act.sa_mask);
act.sa_flags=0;
return sigaction(SIGALRM,&act,NULL);
#else
if(signal(SIGALRM,catch_alarm)==SIG_ERR)
return -1;
else
return 0;
#endif
}
#endif /* !HAVE_DOSISH_SYSTEM */
struct ks_options *
init_ks_options(void)
{
struct ks_options *opt;
opt=calloc(1,sizeof(struct ks_options));
if(opt)
{
opt->action=KS_UNKNOWN;
opt->flags.include_revoked=1;
opt->flags.include_subkeys=1;
opt->flags.check_cert=1;
opt->timeout=DEFAULT_KEYSERVER_TIMEOUT;
opt->path=strdup("/");
if(!opt->path)
{
free(opt);
opt=NULL;
}
}
return opt;
}
void
free_ks_options(struct ks_options *opt)
{
if(opt)
{
free(opt->host);
free(opt->port);
free(opt->scheme);
free(opt->auth);
free(opt->path);
free(opt->opaque);
free(opt->ca_cert_file);
free(opt);
}
}
/* Returns 0 if we "ate" the line. Returns >0, a KEYSERVER_ error
code if that error applies. Returns -1 if we did not match the
line at all. */
int
parse_ks_options(char *line,struct ks_options *opt)
{
int version;
char command[MAX_COMMAND+1];
char host[MAX_HOST+1];
char port[MAX_PORT+1];
char scheme[MAX_SCHEME+1];
char auth[MAX_AUTH+1];
char path[URLMAX_PATH+1];
char opaque[MAX_OPAQUE+1];
char option[MAX_OPTION+1];
if(line[0]=='#')
return 0;
if(sscanf(line,"COMMAND %" MKSTRING(MAX_COMMAND) "s\n",command)==1)
{
command[MAX_COMMAND]='\0';
if(strcasecmp(command,"get")==0)
opt->action=KS_GET;
else if(strcasecmp(command,"getname")==0)
opt->action=KS_GETNAME;
else if(strcasecmp(command,"send")==0)
opt->action=KS_SEND;
else if(strcasecmp(command,"search")==0)
opt->action=KS_SEARCH;
return 0;
}
if(sscanf(line,"HOST %" MKSTRING(MAX_HOST) "s\n",host)==1)
{
host[MAX_HOST]='\0';
free(opt->host);
opt->host=strdup(host);
if(!opt->host)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"PORT %" MKSTRING(MAX_PORT) "s\n",port)==1)
{
port[MAX_PORT]='\0';
free(opt->port);
opt->port=strdup(port);
if(!opt->port)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"SCHEME %" MKSTRING(MAX_SCHEME) "s\n",scheme)==1)
{
scheme[MAX_SCHEME]='\0';
free(opt->scheme);
opt->scheme=strdup(scheme);
if(!opt->scheme)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"AUTH %" MKSTRING(MAX_AUTH) "s\n",auth)==1)
{
auth[MAX_AUTH]='\0';
free(opt->auth);
opt->auth=strdup(auth);
if(!opt->auth)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"PATH %" MKSTRING(URLMAX_PATH) "s\n",path)==1)
{
path[URLMAX_PATH]='\0';
free(opt->path);
opt->path=strdup(path);
if(!opt->path)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"OPAQUE %" MKSTRING(MAX_OPAQUE) "s\n",opaque)==1)
{
opaque[MAX_OPAQUE]='\0';
free(opt->opaque);
opt->opaque=strdup(opaque);
if(!opt->opaque)
return KEYSERVER_NO_MEMORY;
return 0;
}
if(sscanf(line,"VERSION %d\n",&version)==1)
{
if(version!=KEYSERVER_PROTO_VERSION)
return KEYSERVER_VERSION_ERROR;
return 0;
}
if(sscanf(line,"OPTION %" MKSTRING(MAX_OPTION) "[^\n]\n",option)==1)
{
int no=0;
char *start=&option[0];
option[MAX_OPTION]='\0';
if(strncasecmp(option,"no-",3)==0)
{
no=1;
start=&option[3];
}
if(strncasecmp(start,"verbose",7)==0)
{
if(no)
opt->verbose=0;
else if(start[7]=='=')
opt->verbose=atoi(&start[8]);
else
opt->verbose++;
}
else if(strcasecmp(start,"include-disabled")==0)
{
if(no)
opt->flags.include_disabled=0;
else
opt->flags.include_disabled=1;
}
else if(strcasecmp(start,"include-revoked")==0)
{
if(no)
opt->flags.include_revoked=0;
else
opt->flags.include_revoked=1;
}
else if(strcasecmp(start,"include-subkeys")==0)
{
if(no)
opt->flags.include_subkeys=0;
else
opt->flags.include_subkeys=1;
}
else if(strcasecmp(start,"check-cert")==0)
{
if(no)
opt->flags.check_cert=0;
else
opt->flags.check_cert=1;
}
else if(strncasecmp(start,"debug",5)==0)
{
if(no)
opt->debug=0;
else if(start[5]=='=')
opt->debug=atoi(&start[6]);
else if(start[5]=='\0')
opt->debug=1;
}
else if(strncasecmp(start,"timeout",7)==0)
{
if(no)
opt->timeout=0;
else if(start[7]=='=')
opt->timeout=atoi(&start[8]);
else if(start[7]=='\0')
opt->timeout=DEFAULT_KEYSERVER_TIMEOUT;
}
else if(strncasecmp(start,"ca-cert-file",12)==0)
{
if(no)
{
free(opt->ca_cert_file);
opt->ca_cert_file=NULL;
}
else if(start[12]=='=')
{
free(opt->ca_cert_file);
opt->ca_cert_file=strdup(&start[13]);
if(!opt->ca_cert_file)
return KEYSERVER_NO_MEMORY;
}
}
}
return -1;
}
const char *
ks_action_to_string(enum ks_action action)
{
switch(action)
{
case KS_UNKNOWN: return "UNKNOWN";
case KS_GET: return "GET";
case KS_GETNAME: return "GETNAME";
case KS_SEND: return "SEND";
case KS_SEARCH: return "SEARCH";
}
return "?";
}
/* Canonicalize CRLF to just LF by stripping CRs. This actually makes
sense, since on Unix-like machines LF is correct, and on win32-like
machines, our output buffer is opened in textmode and will
re-canonicalize line endings back to CRLF. Since we only need to
handle armored keys, we don't have to worry about odd cases like
CRCRCR and the like. */
void
print_nocr(FILE *stream,const char *str)
{
while(*str)
{
if(*str!='\r')
fputc(*str,stream);
str++;
}
}
enum ks_search_type
classify_ks_search(const char **search)
{
switch(**search)
{
case '*':
(*search)++;
return KS_SEARCH_SUBSTR;
case '=':
(*search)++;
return KS_SEARCH_EXACT;
case '<':
(*search)++;
return KS_SEARCH_MAIL;
case '@':
(*search)++;
return KS_SEARCH_MAILSUB;
case '0':
if((*search)[1]=='x')
{
if(strlen(*search)==10
&& strspn(*search,"abcdefABCDEF1234567890x")==10)
{
(*search)+=2;
return KS_SEARCH_KEYID_SHORT;
}
else if(strlen(*search)==18
&& strspn(*search,"abcdefABCDEF1234567890x")==18)
{
(*search)+=2;
return KS_SEARCH_KEYID_LONG;
}
}
/* fall through */
default:
return KS_SEARCH_SUBSTR;
}
}
int
curl_err_to_gpg_err(CURLcode error)
{
switch(error)
{
case CURLE_OK: return KEYSERVER_OK;
case CURLE_UNSUPPORTED_PROTOCOL: return KEYSERVER_SCHEME_NOT_FOUND;
case CURLE_COULDNT_CONNECT: return KEYSERVER_UNREACHABLE;
case CURLE_FTP_COULDNT_RETR_FILE: return KEYSERVER_KEY_NOT_FOUND;
default: return KEYSERVER_INTERNAL_ERROR;
}
}
#define B64 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
static void
curl_armor_writer(const unsigned char *buf,size_t size,void *cw_ctx)
{
struct curl_writer_ctx *ctx=cw_ctx;
size_t idx=0;
while(idx<size)
{
for(;ctx->armor_remaining<3 && idx<size;ctx->armor_remaining++,idx++)
ctx->armor_ctx[ctx->armor_remaining]=buf[idx];
if(ctx->armor_remaining==3)
{
/* Top 6 bytes of ctx->armor_ctx[0] */
fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
/* Bottom 2 bytes of ctx->armor_ctx[0] and top 4 bytes of
ctx->armor_ctx[1] */
fputc(B64[(((ctx->armor_ctx[0]<<4)&0x30)
|((ctx->armor_ctx[1]>>4)&0x0F))&0x3F],ctx->stream);
/* Bottom 4 bytes of ctx->armor_ctx[1] and top 2 bytes of
ctx->armor_ctx[2] */
fputc(B64[(((ctx->armor_ctx[1]<<2)&0x3C)
|((ctx->armor_ctx[2]>>6)&0x03))&0x3F],ctx->stream);
/* Bottom 6 bytes of ctx->armor_ctx[2] */
fputc(B64[(ctx->armor_ctx[2]&0x3F)],ctx->stream);
ctx->linelen+=4;
if(ctx->linelen>=70)
{
fputc('\n',ctx->stream);
ctx->linelen=0;
}
ctx->armor_remaining=0;
}
}
}
size_t
curl_writer(const void *ptr,size_t size,size_t nmemb,void *cw_ctx)
{
struct curl_writer_ctx *ctx=cw_ctx;
const char *buf=ptr;
size_t i;
if(!ctx->flags.initialized)
{
if(size*nmemb==0)
return 0;
/* The object we're fetching is in binary form */
if(*buf&0x80)
{
ctx->flags.armor=1;
fprintf(ctx->stream,BEGIN"\n\n");
}
else
ctx->marker=BEGIN;
ctx->flags.initialized=1;
}
if(ctx->flags.armor)
curl_armor_writer(ptr,size*nmemb,cw_ctx);
else
{
/* scan the incoming data for our marker */
for(i=0;!ctx->flags.done && i<(size*nmemb);i++)
{
if(buf[i]==ctx->marker[ctx->markeridx])
{
ctx->markeridx++;
if(ctx->marker[ctx->markeridx]=='\0')
{
if(ctx->flags.begun)
ctx->flags.done=1;
else
{
/* We've found the BEGIN marker, so now we're
looking for the END marker. */
ctx->flags.begun=1;
ctx->marker=END;
ctx->markeridx=0;
fprintf(ctx->stream,BEGIN);
continue;
}
}
}
else
ctx->markeridx=0;
if(ctx->flags.begun)
{
/* Canonicalize CRLF to just LF by stripping CRs. This
actually makes sense, since on Unix-like machines LF
is correct, and on win32-like machines, our output
buffer is opened in textmode and will re-canonicalize
line endings back to CRLF. Since this code is just
for handling armored keys, we don't have to worry
about odd cases like CRCRCR and the like. */
if(buf[i]!='\r')
fputc(buf[i],ctx->stream);
}
}
}
return size*nmemb;
}
void
curl_writer_finalize(struct curl_writer_ctx *ctx)
{
if(ctx->flags.armor)
{
if(ctx->armor_remaining==2)
{
/* Top 6 bytes of ctx->armorctx[0] */
fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
/* Bottom 2 bytes of ctx->armor_ctx[0] and top 4 bytes of
ctx->armor_ctx[1] */
fputc(B64[(((ctx->armor_ctx[0]<<4)&0x30)
|((ctx->armor_ctx[1]>>4)&0x0F))&0x3F],ctx->stream);
/* Bottom 4 bytes of ctx->armor_ctx[1] */
fputc(B64[((ctx->armor_ctx[1]<<2)&0x3C)],ctx->stream);
/* Pad */
fputc('=',ctx->stream);
}
else if(ctx->armor_remaining==1)
{
/* Top 6 bytes of ctx->armor_ctx[0] */
fputc(B64[(ctx->armor_ctx[0]>>2)&0x3F],ctx->stream);
/* Bottom 2 bytes of ctx->armor_ctx[0] */
fputc(B64[((ctx->armor_ctx[0]<<4)&0x30)],ctx->stream);
/* Pad */
fputc('=',ctx->stream);
/* Pad */
fputc('=',ctx->stream);
}
fprintf(ctx->stream,"\n"END);
ctx->flags.done=1;
}
}
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