mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
Rewritten
This commit is contained in:
Werner Koch
parent
b113394658
commit
57caafa433
552
g10/armor.c
552
g10/armor.c
@ -49,24 +49,29 @@ static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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static byte asctobin[256]; /* runtime initialized */
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static int is_initialized;
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typedef enum {
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fhdrINIT=0,
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fhdrLF,
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fhdrWAIT,
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fhdrWAITINFO,
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fhdrWAITCLEARSIG,
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fhdrDASH,
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fhdrHEAD,
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fhdrDASH2,
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fhdrINFO
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} fhdr_state_t;
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struct fhdr_struct {
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fhdr_state_t state;
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int count;
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int hdr_line; /* number of the header line */
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char buf[256];
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};
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typedef enum {
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fhdrHASArmor,
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fhdrNOArmor,
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fhdrINIT,
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fhdrINITCont,
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fhdrINITSkip,
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fhdrCHECKBegin,
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fhdrWAITHeader,
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fhdrWAITClearsig,
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fhdrSKIPHeader,
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fhdrCLEARSIG,
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fhdrREADClearsig,
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fhdrEMPTYClearsig,
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fhdrCHECKClearsig,
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fhdrCHECKClearsig2,
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fhdrREADClearsigNext,
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fhdrENDClearsig,
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fhdrTEXT,
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fhdrERROR,
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fhdrERRORShow,
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fhdrEOF
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} fhdr_state_t;
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/* if we encounter this armor string with this index, go
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@ -87,6 +92,10 @@ static char *tail_strings[] = {
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};
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static fhdr_state_t find_header( fhdr_state_t state,
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byte *buf, size_t *r_buflen, IOBUF a, size_t n);
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static void
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initialize(void)
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{
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@ -124,18 +133,14 @@ initialize(void)
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* Returns: True if it seems to be armored
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*/
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static int
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is_armored( byte *buf, size_t len )
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is_armored( byte *buf )
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{
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int ctb, pkttype;
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if( len < 28 )
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return 0; /* not even enough space for the "---BEGIN"... */
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ctb = *buf;
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if( !(ctb & 0x80) )
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return 1; /* invalid packet: assume it is armored */
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pkttype = ctb & 0x40 ? (ctb & 0x3f) : ((ctb>>2)&0xf);
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/*lenbytes = (ctb & 0x40) || ((ctb&3)==3)? 0 : (1<<(ctb & 3));*/
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switch( pkttype ) {
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case PKT_PUBLIC_CERT:
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case PKT_SECRET_CERT:
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@ -152,120 +157,246 @@ is_armored( byte *buf, size_t len )
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}
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static int
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find_header( struct fhdr_struct *fhdr, int c )
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/****************
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* parse an ascii armor.
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* Returns: the state,
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* the remaining bytes in BUF are returned in RBUFLEN.
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*/
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static fhdr_state_t
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find_header( fhdr_state_t state, byte *buf, size_t *r_buflen, IOBUF a, size_t n)
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{
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int i;
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int c, i;
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const char *s;
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char *p;
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size_t buflen;
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int cont;
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int clearsig=0;
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int hdr_line=0;
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if( c == '\n' ) {
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switch( fhdr->state ) {
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case fhdrINFO:
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if( !fhdr->count )
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return 1; /* blank line: data starts with the next line */
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fhdr->buf[fhdr->count] = 0;
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log_debug("armor line: '%s'\n", fhdr->buf );
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/* fall through */
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case fhdrWAITINFO:
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fhdr->state = fhdrINFO;
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fhdr->count = 0;
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break;
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case fhdrWAITCLEARSIG:
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if( fhdr->count++ == 1 ) /* skip the empty line */
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return 1; /* clear signed text follows */
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else if( fhdr->count > 1 )
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fhdr->state = fhdrWAIT; /* was not valid */
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break;
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default:
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fhdr->state = fhdrLF;
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break;
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}
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}
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else {
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switch( fhdr->state ) {
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case fhdrINIT:
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case fhdrLF:
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if( c == '-' ) {
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fhdr->state = fhdrDASH;
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fhdr->count = 1;
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}
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buflen = *r_buflen;
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assert(buflen >= 100 );
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buflen--;
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do {
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switch( state ) {
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case fhdrHASArmor:
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/* read 28 bytes, which is the bare minimum for a BEGIN...
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* and check wether this has a Armor. */
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c = 0;
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for(n=0; n < 28 && (c=iobuf_get(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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if( n < 28 || c == -1 )
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state = fhdrNOArmor; /* too short */
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else if( !is_armored( buf ) )
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state = fhdrNOArmor;
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else
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fhdr->state = fhdrWAIT;
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state = fhdrINITCont;
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break;
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case fhdrWAIT:
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case fhdrWAITINFO:
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case fhdrWAITCLEARSIG:
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case fhdrINIT: /* read some stuff into buffer */
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n = 0;
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case fhdrINITCont: /* read more stuff into buffer */
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c = 0;
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for(; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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state = c == '\n' ? fhdrCHECKBegin :
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c == -1 ? fhdrEOF : fhdrINITSkip;
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break;
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case fhdrDASH:
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if( c == '-' ) {
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if( ++fhdr->count == 5 ) {
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fhdr->state = fhdrHEAD;
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fhdr->count = 0;
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case fhdrINITSkip:
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while( (c=iobuf_get(a)) != -1 && c != '\n' )
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;
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state = c == -1? fhdrEOF : fhdrINIT;
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break;
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case fhdrSKIPHeader:
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while( (c=iobuf_get(a)) != -1 && c != '\n' )
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;
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state = c == -1? fhdrEOF : fhdrWAITHeader;
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break;
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case fhdrWAITHeader: /* wait for Header lines */
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c = 0;
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for(n=0; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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buf[n] = 0;
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if( n < buflen || c == '\n' ) {
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if( n && buf[0] != '\r') { /* maybe a header */
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if( strchr( buf, ':') ) { /* yes */
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log_debug("armor header: ");
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print_string( stderr, buf, n );
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putc('\n', stderr);
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state = fhdrWAITHeader;
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}
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else
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state = fhdrTEXT;
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}
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else if( !n || (buf[0] == '\r' && !buf[1]) ) { /* empty line */
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if( clearsig )
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state = fhdrWAITClearsig;
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else {
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/* this is not really correct: if we do not have
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* a clearsig and not armor lines we are not allowed
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* to have an empty line */
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n = 0;
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state = fhdrTEXT;
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}
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}
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else {
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log_debug("invalid armor header: ");
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print_string( stderr, buf, n );
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putc('\n', stderr);
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state = fhdrERROR;
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}
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}
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else if( c != -1 ) {
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if( strchr( buf, ':') ) { /* buffer to short, but this is okay*/
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log_debug("armor header: ");
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print_string( stderr, buf, n );
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fputs("[...]\n", stderr); /* indicate it is truncated */
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state = fhdrSKIPHeader; /* skip rest of line */
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}
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else /* line too long */
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state = fhdrERROR;
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}
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else
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fhdr->state = fhdrWAIT;
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state = fhdrEOF;
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break;
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case fhdrHEAD:
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if( c != '-' ) {
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if( fhdr->count < DIM(fhdr->buf)-1 )
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fhdr->buf[fhdr->count++] = c;
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case fhdrWAITClearsig: /* skip all empty lines (for clearsig) */
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c = 0;
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for(n=0; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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if( n < buflen || c == '\n' ) {
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buf[n] = 0;
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if( !n || (buf[0]=='\r' && !buf[1]) ) /* empty line */
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;
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else
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state = fhdrTEXT;
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}
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else
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state = fhdrEOF;
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break;
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case fhdrENDClearsig:
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case fhdrCHECKBegin:
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state = state == fhdrCHECKBegin ? fhdrINITSkip : fhdrERRORShow;
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if( n < 15 )
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break; /* too short */
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if( memcmp( buf, "-----", 5 ) )
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break;
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buf[n] = 0;
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p = strstr(buf+5, "-----");
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if( !p )
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break;
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*p = 0;
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p += 5;
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if( *p == '\r' )
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p++;
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if( *p )
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break; /* garbage after dashes */
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p = buf+5;
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for(i=0; (s=head_strings[i]); i++ )
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if( !strcmp(s, p) )
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break;
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if( !s )
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break; /* unknown begin line */
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/* found the begin line */
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hdr_line = i;
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state = fhdrWAITHeader;
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if( hdr_line == BEGIN_SIGNED_MSG_IDX )
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clearsig = 1;
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log_debug("armor: %s\n", head_strings[hdr_line]);
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break;
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case fhdrCLEARSIG:
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case fhdrEMPTYClearsig:
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case fhdrREADClearsig:
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/* we are at the start of a line: read a clearsig into the buffer
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* we have to look for a the header line or dashd escaped text*/
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n = 0;
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c = 0;
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for(; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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buf[n] = 0;
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if( c == -1 )
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state = fhdrEOF;
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else if( !n || ( buf[0]=='\r' && !buf[1] ) ) {
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state = fhdrEMPTYClearsig;
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/* FIXME: handle it */
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}
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else if( c == '\n' )
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state = fhdrCHECKClearsig2;
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else
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state = fhdrCHECKClearsig;
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break;
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case fhdrCHECKClearsig:
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case fhdrCHECKClearsig2:
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/* check the clearsig line */
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if( n > 15 && !memcmp(buf, "-----", 5 ) )
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state = fhdrENDClearsig;
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else if( buf[0] == '-' && buf[1] == ' ' ) {
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/* dash escaped line */
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if( buf[2] == '-' || ( n > 6 && !memcmp(buf+2, "From ", 5))) {
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for(i=2; i < n; i++ )
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buf[i-2] = buf[i];
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n -= 2;
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buf[n] = 0; /* not really needed */
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state = state == fhdrCHECKClearsig2 ?
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fhdrREADClearsig : fhdrREADClearsigNext;
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/* FIXME: add the lf to the buffer */
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}
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else {
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log_debug("invalid dash escaped line: ");
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print_string( stderr, buf, n );
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putc('\n', stderr);
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state = fhdrERROR;
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}
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}
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else {
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fhdr->buf[fhdr->count] = 0;
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for(i=0; (s=head_strings[i]); i++ )
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if( !strcmp(s,fhdr->buf) )
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break;
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if( s ) { /* found string; wait for trailing dashes */
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fhdr->hdr_line = i;
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fhdr->state = fhdrDASH2;
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fhdr->count = 1;
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}
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else
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fhdr->state = fhdrWAIT;
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state = state == fhdrCHECKClearsig2 ?
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fhdrREADClearsig : fhdrREADClearsigNext;
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/* FIXME: add the lf to the buffer */
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}
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break;
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case fhdrDASH2:
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if( c == '-' ) {
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if( ++fhdr->count == 5 ) {
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fhdr->state = fhdrWAITINFO;
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log_debug("armor head: '%s'\n",
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head_strings[fhdr->hdr_line]);
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fhdr->state = fhdr->hdr_line == BEGIN_SIGNED_MSG_IDX
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? fhdrWAITCLEARSIG : fhdrWAITINFO;
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if( fhdr->state == fhdrWAITCLEARSIG )
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fhdr->count = 0;
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}
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}
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else
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fhdr->state = fhdrWAIT;
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case fhdrREADClearsigNext:
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/* Read to the end of the line, do not care about checking
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* for dashed escaped text of headers */
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break;
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case fhdrINFO:
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if( fhdr->count < DIM(fhdr->buf)-1 )
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fhdr->buf[fhdr->count++] = c;
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case fhdrERRORShow:
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log_debug("invalid clear text header: ");
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print_string( stderr, buf, n );
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putc('\n', stderr);
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state = fhdrERROR;
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break;
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default: abort();
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default: BUG();
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}
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}
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return 0;
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}
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switch( state ) {
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case fhdrINIT:
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case fhdrINITCont:
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case fhdrINITSkip:
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case fhdrCHECKBegin:
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case fhdrWAITHeader:
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case fhdrWAITClearsig:
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case fhdrSKIPHeader:
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case fhdrEMPTYClearsig:
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case fhdrCHECKClearsig:
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case fhdrCHECKClearsig2:
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case fhdrERRORShow:
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cont = 1;
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break;
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default: cont = 0;
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}
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} while( cont );
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/****************
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* check wether the trailer is okay.
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* Returns: 0 := still in trailer
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* -1 := Okay
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* 1 := Error in trailer
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*/
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static int
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check_trailer( struct fhdr_struct *fhdr, int c )
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{
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return -1;
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/* FIXME: implement this ! */
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if( clearsig && state == fhdrTEXT )
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state = fhdrCLEARSIG;
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*r_buflen = n;
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return state;
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}
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@ -274,59 +405,45 @@ static int
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check_input( armor_filter_context_t *afx, IOBUF a )
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{
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int rc = 0;
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int c;
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size_t n = 0, nn=0;
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struct fhdr_struct fhdr;
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size_t n;
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fhdr_state_t state = afx->parse_state;
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assert( DIM(afx->helpbuf) >= 50 );
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memset( &fhdr, 0, sizeof(fhdr) );
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if( state != fhdrENDClearsig )
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state = fhdrHASArmor;
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/* read a couple of bytes */
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for( n=0; n < DIM(afx->helpbuf); n++ ) {
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if( (c=iobuf_get(a)) == -1 )
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break;
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afx->helpbuf[n] = c & 0xff;
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}
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if( !n )
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rc = -1;
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else if( is_armored( afx->helpbuf, n ) ) {
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for(nn=0; nn < n; nn++ )
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if( find_header( &fhdr, afx->helpbuf[nn] ) )
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break;
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if( nn == n ) { /* continue read */
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while( (c=iobuf_get(a)) != -1 )
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if( find_header( &fhdr, c ) )
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break;
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if( c == -1 )
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rc = -1; /* eof */
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}
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if( !rc && fhdr.hdr_line == BEGIN_SIGNED_MSG_IDX ) {
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/* start fake package mode (for clear signatures) */
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nn++;
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afx->helplen = n;
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afx->helpidx = nn;
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afx->templen = 0;
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afx->tempidx = 0;
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afx->fake = m_alloc_clear( sizeof(struct fhdr_struct) );
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}
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else if( !rc ) {
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/* next byte to read or helpbuf[nn+1]
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* is the first rad64 byte */
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nn++;
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afx->inp_checked = 1;
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afx->crc = CRCINIT;
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afx->idx = 0;
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afx->radbuf[0] = 0;
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afx->helplen = n;
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afx->helpidx = nn;
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}
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}
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else {
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n = DIM(afx->helpbuf);
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state = find_header( state, afx->helpbuf, &n, a, afx->helplen );
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switch( state ) {
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case fhdrNOArmor:
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afx->inp_checked = 1;
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afx->inp_bypass = 1;
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afx->helplen = n;
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break;
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case fhdrERROR:
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case fhdrEOF:
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rc = -1;
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break;
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|
||||
case fhdrCLEARSIG: /* start fake package mode (for clear signatures) */
|
||||
afx->helplen = n;
|
||||
afx->helpidx = 0;
|
||||
afx->faked = 1;
|
||||
break;
|
||||
|
||||
case fhdrTEXT:
|
||||
afx->helplen = n;
|
||||
afx->helpidx = 0;
|
||||
afx->inp_checked = 1;
|
||||
afx->crc = CRCINIT;
|
||||
afx->idx = 0;
|
||||
afx->radbuf[0] = 0;
|
||||
break;
|
||||
|
||||
default: BUG();
|
||||
}
|
||||
|
||||
afx->parse_state = state;
|
||||
return rc;
|
||||
}
|
||||
|
||||
@ -338,71 +455,61 @@ fake_packet( armor_filter_context_t *afx, IOBUF a,
|
||||
size_t *retn, byte *buf, size_t size )
|
||||
{
|
||||
int rc = 0;
|
||||
int c;
|
||||
size_t n = 0;
|
||||
struct fhdr_struct *fhdr = afx->fake;
|
||||
byte *helpbuf = afx->helpbuf;
|
||||
int helpidx = afx->helpidx;
|
||||
int helplen = afx->helplen;
|
||||
byte *tempbuf = afx->tempbuf;
|
||||
int tempidx = afx->tempidx;
|
||||
int templen = afx->templen;
|
||||
size_t len = 0;
|
||||
size_t n, nn;
|
||||
fhdr_state_t state = afx->parse_state;
|
||||
|
||||
/* FIXME: have to read one ahead or do some other mimic to
|
||||
* get rid of the lf before the "begin signed message"
|
||||
*/
|
||||
size = 100; /* FIXME: only used for testing (remove it) */
|
||||
n = 2; /* reserve 2 bytes for the length header */
|
||||
while( n < size-2 ) { /* and 2 for the term header */
|
||||
if( templen && (fhdr->state == fhdrWAIT || fhdr->state == fhdrLF) ) {
|
||||
if( tempidx < templen ) {
|
||||
buf[n++] = tempbuf[tempidx++];
|
||||
continue;
|
||||
}
|
||||
tempidx = templen = 0;
|
||||
}
|
||||
|
||||
if( helpidx < helplen )
|
||||
c = helpbuf[helpidx++];
|
||||
else if( (c=iobuf_get(a)) == -1 )
|
||||
break;
|
||||
if( find_header( fhdr, c ) ) {
|
||||
m_free(afx->fake);
|
||||
afx->fake = NULL;
|
||||
afx->inp_checked = 1;
|
||||
afx->crc = CRCINIT;
|
||||
afx->idx = 0;
|
||||
afx->radbuf[0] = 0;
|
||||
/* we don't need to care about the tempbuf */
|
||||
break;
|
||||
len = 2; /* reserve 2 bytes for the length header */
|
||||
size -= 2; /* and 2 for the term header */
|
||||
while( !rc && len < size ) {
|
||||
if( afx->helpidx < afx->helplen ) { /* flush the last buffer */
|
||||
n = afx->helplen;
|
||||
for(nn=afx->helpidx; len < size && nn < n ; nn++ )
|
||||
buf[len++] = afx->helpbuf[nn];
|
||||
afx->helpidx = nn;
|
||||
continue;
|
||||
}
|
||||
if( fhdr->state == fhdrWAIT || fhdr->state == fhdrLF ) {
|
||||
if( templen ) {
|
||||
tempidx = 0;
|
||||
continue;
|
||||
}
|
||||
buf[n++] = c;
|
||||
if( state == fhdrEOF ) {
|
||||
rc = -1;
|
||||
continue;
|
||||
}
|
||||
else if( fhdr->state == fhdrWAITINFO
|
||||
|| fhdr->state == fhdrINFO )
|
||||
;
|
||||
else { /* store it in another temp. buf */
|
||||
assert( templen < DIM(afx->tempbuf) );
|
||||
tempbuf[templen++] = c;
|
||||
/* read a new one */
|
||||
n = DIM(afx->helpbuf);
|
||||
afx->helpidx = 0;
|
||||
state = find_header( state, afx->helpbuf, &n, a, 0 );
|
||||
switch( state) {
|
||||
case fhdrERROR:
|
||||
case fhdrEOF:
|
||||
rc = -1;
|
||||
break;
|
||||
|
||||
case fhdrCLEARSIG:
|
||||
case fhdrREADClearsig:
|
||||
case fhdrREADClearsigNext:
|
||||
afx->helplen = n;
|
||||
break;
|
||||
|
||||
case fhdrENDClearsig:
|
||||
afx->helplen = n;
|
||||
afx->faked = 0;
|
||||
rc = -1;
|
||||
break;
|
||||
|
||||
default: BUG();
|
||||
}
|
||||
}
|
||||
buf[0] = (n-2) >> 8;
|
||||
buf[1] = (n-2);
|
||||
if( !afx->fake ) { /* write last (ending) length header */
|
||||
buf[n++] = 0;
|
||||
buf[n++] = 0;
|
||||
buf[0] = (len-2) >> 8;
|
||||
buf[1] = (len-2);
|
||||
if( state == fhdrENDClearsig ) { /* write last (ending) length header */
|
||||
buf[len++] = 0;
|
||||
buf[len++] = 0;
|
||||
rc = 0;
|
||||
}
|
||||
|
||||
afx->helpidx = helpidx;
|
||||
afx->helplen = helplen;
|
||||
afx->tempidx = tempidx;
|
||||
afx->templen = templen;
|
||||
*retn = n;
|
||||
afx->parse_state = state;
|
||||
*retn = len;
|
||||
return rc;
|
||||
}
|
||||
|
||||
@ -493,11 +600,8 @@ radix64_read( armor_filter_context_t *afx, IOBUF a, size_t *retn,
|
||||
log_error("CRC error; %06lx - %06lx\n",
|
||||
(ulong)afx->crc, (ulong)mycrc);
|
||||
else {
|
||||
struct fhdr_struct fhdr;
|
||||
|
||||
memset( &fhdr, 0, sizeof(fhdr) );
|
||||
for(rc=0;!rc;) {
|
||||
rc = check_trailer( &fhdr, c );
|
||||
rc = 0 /*check_trailer( &fhdr, c )*/;
|
||||
if( !rc ) {
|
||||
if( afx->helpidx < afx->helplen )
|
||||
c = afx->helpbuf[afx->helpidx++];
|
||||
@ -561,13 +665,13 @@ armor_filter( void *opaque, int control,
|
||||
return -1;
|
||||
}
|
||||
|
||||
if( afx->fake )
|
||||
if( afx->faked )
|
||||
rc = fake_packet( afx, a, &n, buf, size );
|
||||
else if( !afx->inp_checked ) {
|
||||
rc = check_input( afx, a );
|
||||
if( afx->inp_bypass )
|
||||
;
|
||||
else if( afx->fake ) {
|
||||
else if( afx->faked ) {
|
||||
/* the buffer is at least 20 bytes long, so it
|
||||
* is easy to construct a packet */
|
||||
buf[0] = 0xaf; /* old packet format, type 11, var length */
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user