#define mpp(s,n) do { char *p = mpz_get_str(NULL,16,n); printf("%s 0x%sL\n", s, p); free(p); } while (0)
+struct rsacommon {
+ uint8_t *hashbuf;
+};
+
struct rsapriv {
closure_t cl;
struct sigprivkey_if ops;
struct cloc loc;
+ struct rsacommon common;
MP_INT n;
MP_INT p, dp;
MP_INT q, dq;
closure_t cl;
struct sigpubkey_if ops;
struct cloc loc;
+ struct rsacommon common;
MP_INT e;
MP_INT n;
};
static const char *hexchars="0123456789abcdef";
+static void rsa_sethash(struct rsacommon *c, struct hash_if *hash,
+ const struct hash_if **in_ops)
+{
+ free(c->hashbuf);
+ c->hashbuf=safe_malloc(hash->hlen, "generate_msg");
+ *in_ops=hash;
+}
+static void rsa_pub_sethash(void *sst, struct hash_if *hash)
+{
+ struct rsapub *st=sst;
+ rsa_sethash(&st->common, hash, &st->ops.hash);
+}
+static void rsa_priv_sethash(void *sst, struct hash_if *hash)
+{
+ struct rsapriv *st=sst;
+ rsa_sethash(&st->common, hash, &st->ops.hash);
+}
+static void rsacommon_dispose(struct rsacommon *c)
+{
+ free(c->hashbuf);
+}
+
static void emsa_pkcs1(MP_INT *n, MP_INT *m,
const uint8_t *data, int32_t datalen)
{
msize=mpz_sizeinbase(n, 16);
if (datalen*2+6>=msize) {
- fatal("rsa_sign: message too big");
+ fatal("rsa: message too big");
}
strcpy(buff,"0001");
mpz_init(&a);
mpz_init(&b);
+ hash_hash(st->ops.hash,data,datalen,st->common.hashbuf);
/* Construct the message representative. */
- emsa_pkcs1(&st->n, &a, data, datalen);
+ emsa_pkcs1(&st->n, &a, st->common.hashbuf, st->ops.hash->hlen);
/*
* Produce an RSA signature (a^d mod n) using the Chinese
return ok;
}
+static bool_t rsa_sig_unpick(void *sst, struct buffer_if *msg,
+ struct alg_msg_data *sig)
+{
+ uint8_t *lp = buf_unprepend(msg, 2);
+ if (!lp) return False;
+ sig->len = get_uint16(lp);
+ sig->start = buf_unprepend(msg, sig->len);
+ if (!sig->start) return False;
+
+ /* In `rsa_sig_check' below, we assume that we can write a nul
+ * terminator following the signature. Make sure there's enough space.
+ */
+ if (msg->start >= msg->base + msg->alloclen)
+ return False;
+
+ return True;
+}
+
static sig_checksig_fn rsa_sig_check;
static bool_t rsa_sig_check(void *sst, uint8_t *data, int32_t datalen,
- cstring_t signature)
+ const struct alg_msg_data *sig)
{
struct rsapub *st=sst;
MP_INT a, b, c;
mpz_init(&b);
mpz_init(&c);
- emsa_pkcs1(&st->n, &a, data, datalen);
+ hash_hash(st->ops.hash,data,datalen,st->common.hashbuf);
+ emsa_pkcs1(&st->n, &a, st->common.hashbuf, st->ops.hash->hlen);
- mpz_set_str(&b, signature, 16);
+ /* Terminate signature with a '0' - already checked that this will fit */
+ int save = sig->start[sig->len];
+ sig->start[sig->len] = 0;
+ mpz_set_str(&b, sig->start, 16);
+ sig->start[sig->len] = save;
mpz_powm(&c, &b, &st->e, &st->n);
return ok;
}
+static void rsapub_dispose(void *sst) {
+ struct rsapub *st=sst;
+
+ mpz_clear(&st->e);
+ mpz_clear(&st->n);
+ rsacommon_dispose(&st->common);
+ free(st);
+}
+
static list_t *rsapub_apply(closure_t *self, struct cloc loc, dict_t *context,
list_t *args)
{
st->cl.apply=NULL;
st->cl.interface=&st->ops;
st->ops.st=st;
+ st->ops.sethash=rsa_pub_sethash;
+ st->common.hashbuf=NULL;
+ st->ops.unpick=rsa_sig_unpick;
st->ops.check=rsa_sig_check;
+ st->ops.hash=0;
+ st->ops.dispose=rsapub_dispose;
st->loc=loc;
i=list_elem(args,0);
return new_closure(&st->cl);
}
-static uint32_t keyfile_get_int(struct cloc loc, FILE *f)
+struct rsapriv_load_ctx {
+ void (*verror)(struct rsapriv_load_ctx *l,
+ FILE *maybe_f, bool_t unsup,
+ const char *message, va_list args);
+ bool_t (*postreadcheck)(struct rsapriv_load_ctx *l, FILE *f);
+ union {
+ struct {
+ struct cloc loc;
+ } apply;
+ struct {
+ struct log_if *log;
+ } tryload;
+ } u;
+};
+
+#define LDFATAL(...) ({ load_error(l,0,0,__VA_ARGS__); goto error_out; })
+#define LDUNSUP(...) ({ load_error(l,0,1,__VA_ARGS__); goto error_out; })
+#define LDFATAL_FILE(...) ({ load_error(l,f,0,__VA_ARGS__); goto error_out; })
+#define LDUNSUP_FILE(...) ({ load_error(l,f,1,__VA_ARGS__); goto error_out; })
+#define FREE(b) ({ free((b)); (b)=0; })
+#define KEYFILE_GET(is) ({ \
+ uint##is##_t keyfile_get_tmp=keyfile_get_##is(l,f); \
+ if (!l->postreadcheck(l,f)) goto error_out; \
+ keyfile_get_tmp; \
+ })
+
+static uint32_t keyfile_get_32(struct rsapriv_load_ctx *l, FILE *f)
{
uint32_t r;
r=fgetc(f)<<24;
r|=fgetc(f)<<16;
r|=fgetc(f)<<8;
r|=fgetc(f);
- cfgfile_postreadcheck(loc,f);
return r;
}
-static uint16_t keyfile_get_short(struct cloc loc, FILE *f)
+static uint16_t keyfile_get_16(struct rsapriv_load_ctx *l, FILE *f)
{
uint16_t r;
r=fgetc(f)<<8;
r|=fgetc(f);
- cfgfile_postreadcheck(loc,f);
return r;
}
-static list_t *rsapriv_apply(closure_t *self, struct cloc loc, dict_t *context,
- list_t *args)
+static void load_error(struct rsapriv_load_ctx *l, FILE *maybe_f,
+ bool_t unsup, const char *fmt, ...)
{
- struct rsapriv *st;
- FILE *f;
- cstring_t filename;
- item_t *i;
+ va_list al;
+ va_start(al,fmt);
+ l->verror(l,maybe_f,unsup,fmt,al);
+ va_end(al);
+}
+
+static void rsapriv_dispose(void *sst)
+{
+ struct rsapriv *st=sst;
+ mpz_clear(&st->n);
+ mpz_clear(&st->p); mpz_clear(&st->dp);
+ mpz_clear(&st->q); mpz_clear(&st->dq);
+ mpz_clear(&st->w);
+ rsacommon_dispose(&st->common);
+ free(st);
+}
+
+static struct rsapriv *rsa_loadpriv_core(struct rsapriv_load_ctx *l,
+ FILE *f, struct cloc loc,
+ bool_t do_validity_check)
+{
+ struct rsapriv *st=0;
long length;
- uint8_t *b, *c;
+ uint8_t *b=0, *c=0;
int cipher_type;
MP_INT e,d,iqmp,tmp,tmp2,tmp3;
bool_t valid;
+ mpz_init(&e);
+ mpz_init(&d);
+ mpz_init(&iqmp);
+ mpz_init(&tmp);
+ mpz_init(&tmp2);
+ mpz_init(&tmp3);
+
NEW(st);
st->cl.description="rsapriv";
st->cl.type=CL_SIGPRIVKEY;
st->cl.apply=NULL;
st->cl.interface=&st->ops;
st->ops.st=st;
+ st->ops.sethash=rsa_priv_sethash;
+ st->common.hashbuf=NULL;
st->ops.sign=rsa_sign;
+ st->ops.hash=0;
+ st->ops.dispose=rsapriv_dispose;
st->loc=loc;
+ mpz_init(&st->n);
+ mpz_init(&st->q);
+ mpz_init(&st->p);
+ mpz_init(&st->dp);
+ mpz_init(&st->dq);
+ mpz_init(&st->w);
- /* Argument is filename pointing to SSH1 private key file */
- i=list_elem(args,0);
- if (i) {
- if (i->type!=t_string) {
- cfgfatal(i->loc,"rsa-private","first argument must be a string\n");
- }
- filename=i->data.string;
- } else {
- filename=NULL; /* Make compiler happy */
- cfgfatal(loc,"rsa-private","you must provide a filename\n");
- }
-
- f=fopen(filename,"rb");
if (!f) {
- if (just_check_config) {
- Message(M_WARNING,"rsa-private (%s:%d): cannot open keyfile "
- "\"%s\"; assuming it's valid while we check the "
- "rest of the configuration\n",loc.file,loc.line,filename);
- goto assume_valid;
- } else {
- fatal_perror("rsa-private (%s:%d): cannot open file \"%s\"",
- loc.file,loc.line,filename);
- }
+ assert(just_check_config);
+ goto assume_valid;
}
/* Check that the ID string is correct */
length=strlen(AUTHFILE_ID_STRING)+1;
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1 || memcmp(b,AUTHFILE_ID_STRING,length)!=0) {
- cfgfatal_maybefile(f,loc,"rsa-private","failed to read magic ID"
- " string from SSH1 private keyfile \"%s\"\n",
- filename);
+ LDUNSUP_FILE("failed to read magic ID"
+ " string from SSH1 private keyfile\n");
}
- free(b);
+ FREE(b);
cipher_type=fgetc(f);
- keyfile_get_int(loc,f); /* "Reserved data" */
+ KEYFILE_GET(32); /* "Reserved data" */
if (cipher_type != 0) {
- cfgfatal(loc,"rsa-private","we don't support encrypted keyfiles\n");
+ LDUNSUP("we don't support encrypted keyfiles\n");
}
/* Read the public key */
- keyfile_get_int(loc,f); /* Not sure what this is */
- length=(keyfile_get_short(loc,f)+7)/8;
+ KEYFILE_GET(32); /* Not sure what this is */
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausible length %ld for modulus\n",
+ LDFATAL("implausible length %ld for modulus\n",
length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f) != 1) {
- cfgfatal_maybefile(f,loc,"rsa-private","error reading modulus\n");
+ LDFATAL_FILE("error reading modulus\n");
}
- mpz_init(&st->n);
read_mpbin(&st->n,b,length);
- free(b);
- length=(keyfile_get_short(loc,f)+7)/8;
+ FREE(b);
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausible length %ld for e\n",length);
+ LDFATAL("implausible length %ld for e\n",length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private","error reading e\n");
+ LDFATAL_FILE("error reading e\n");
}
- mpz_init(&e);
read_mpbin(&e,b,length);
- free(b);
+ FREE(b);
- length=keyfile_get_int(loc,f);
+ length=KEYFILE_GET(32);
if (length>1024) {
- cfgfatal(loc,"rsa-private","implausibly long (%ld) key comment\n",
+ LDFATAL("implausibly long (%ld) key comment\n",
length);
}
c=safe_malloc(length+1,"rsapriv_apply");
if (fread(c,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private","error reading key comment\n");
+ LDFATAL_FILE("error reading key comment\n");
}
c[length]=0;
/* Check that the next two pairs of characters are identical - the
keyfile is not encrypted, so they should be */
- if (keyfile_get_short(loc,f) != keyfile_get_short(loc,f)) {
- cfgfatal(loc,"rsa-private","corrupt keyfile\n");
+ if (KEYFILE_GET(16) != KEYFILE_GET(16)) {
+ LDFATAL("corrupt keyfile\n");
}
/* Read d */
- length=(keyfile_get_short(loc,f)+7)/8;
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausibly long (%ld) decryption key\n",
+ LDFATAL("implausibly long (%ld) decryption key\n",
length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private",
- "error reading decryption key\n");
+ LDFATAL_FILE("error reading decryption key\n");
}
- mpz_init(&d);
read_mpbin(&d,b,length);
- free(b);
+ FREE(b);
/* Read iqmp (inverse of q mod p) */
- length=(keyfile_get_short(loc,f)+7)/8;
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausibly long (%ld)"
+ LDFATAL("implausibly long (%ld)"
" iqmp auxiliary value\n", length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private",
- "error reading decryption key\n");
+ LDFATAL_FILE("error reading decryption key\n");
}
- mpz_init(&iqmp);
read_mpbin(&iqmp,b,length);
- free(b);
+ FREE(b);
/* Read q (the smaller of the two primes) */
- length=(keyfile_get_short(loc,f)+7)/8;
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausibly long (%ld) q value\n",
+ LDFATAL("implausibly long (%ld) q value\n",
length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private",
- "error reading q value\n");
+ LDFATAL_FILE("error reading q value\n");
}
- mpz_init(&st->q);
read_mpbin(&st->q,b,length);
- free(b);
+ FREE(b);
/* Read p (the larger of the two primes) */
- length=(keyfile_get_short(loc,f)+7)/8;
+ length=(KEYFILE_GET(16)+7)/8;
if (length>RSA_MAX_MODBYTES) {
- cfgfatal(loc,"rsa-private","implausibly long (%ld) p value\n",
+ LDFATAL("implausibly long (%ld) p value\n",
length);
}
b=safe_malloc(length,"rsapriv_apply");
if (fread(b,length,1,f)!=1) {
- cfgfatal_maybefile(f,loc,"rsa-private",
- "error reading p value\n");
+ LDFATAL_FILE("error reading p value\n");
}
- mpz_init(&st->p);
read_mpbin(&st->p,b,length);
- free(b);
+ FREE(b);
- if (fclose(f)!=0) {
- fatal_perror("rsa-private (%s:%d): fclose",loc.file,loc.line);
+ if (ferror(f)) {
+ fatal_perror("rsa-private (%s:%d): ferror",loc.file,loc.line);
}
/*
* values for fast CRT signing.
*/
valid=False;
- i=list_elem(args,1);
- mpz_init(&tmp);
- mpz_init(&tmp2);
- mpz_init(&tmp3);
- if (i && i->type==t_bool && i->data.bool==False) {
- Message(M_INFO,"rsa-private (%s:%d): skipping RSA key validity "
- "check\n",loc.file,loc.line);
- } else {
+ if (do_validity_check) {
/* Verify that p*q is equal to n. */
mpz_mul(&tmp, &st->p, &st->q);
if (mpz_cmp(&tmp, &st->n) != 0)
* dq == d mod (q-1) similarly mod q
* w == iqmp * q so that w == 0 mod q, and w == 1 mod p
*/
- mpz_init(&st->dp);
- mpz_init(&st->dq);
- mpz_init(&st->w);
mpz_sub_ui(&tmp, &st->p, 1);
mpz_mod(&st->dp, &d, &tmp);
mpz_sub_ui(&tmp, &st->q, 1);
done_checks:
if (!valid) {
- cfgfatal(loc,"rsa-private","file \"%s\" does not contain a "
- "valid RSA key!\n",filename);
+ LDFATAL("file does not contain a "
+ "valid RSA key!\n");
}
+
+assume_valid:
+out:
mpz_clear(&tmp);
mpz_clear(&tmp2);
mpz_clear(&tmp3);
- free(c);
+ FREE(b);
+ FREE(c);
mpz_clear(&e);
mpz_clear(&d);
mpz_clear(&iqmp);
-assume_valid:
+ return st;
+
+error_out:
+ if (st) rsapriv_dispose(st);
+ st=0;
+ goto out;
+}
+
+FORMAT(printf,4,0)
+static void verror_tryload(struct rsapriv_load_ctx *l,
+ FILE *maybe_f, bool_t unsup,
+ const char *message, va_list args)
+{
+ int class=unsup ? M_DEBUG : M_ERR;
+ slilog_part(l->u.tryload.log,class,"rsa1priv load: ");
+ vslilog(l->u.tryload.log,class,message,args);
+}
+
+static bool_t postreadcheck_tryload(struct rsapriv_load_ctx *l, FILE *f)
+{
+ assert(!ferror(f));
+ if (feof(f)) { load_error(l,0,0,"eof mid-integer"); return False; }
+ return True;
+}
+
+bool_t rsa1_loadpriv(const struct sigscheme_info *algo,
+ struct buffer_if *privkeydata,
+ struct sigprivkey_if **sigpriv_r,
+ struct log_if *log)
+{
+ FILE *f=0;
+ struct rsapriv *st=0;
+
+ f=fmemopen(privkeydata->start,privkeydata->size,"r");
+ if (!f) {
+ slilog(log,M_ERR,"failed to fmemopen private key file\n");
+ goto error_out;
+ }
+
+ struct cloc loc;
+ loc.file="dynamically loaded";
+ loc.line=0;
+
+ struct rsapriv_load_ctx l[1];
+ l->verror=verror_tryload;
+ l->postreadcheck=postreadcheck_tryload;
+ l->u.tryload.log=log;
+
+ st=rsa_loadpriv_core(l,f,loc,True);
+ if (!st) goto error_out;
+ goto out;
+
+ error_out:
+ if (st) { free(st); st=0; }
+ out:
+ if (f) fclose(f);
+ if (!st) return False;
+ *sigpriv_r=&st->ops;
+ return True;
+}
+
+static void verror_cfgfatal(struct rsapriv_load_ctx *l,
+ FILE *maybe_f, bool_t unsup,
+ const char *message, va_list args)
+{
+ vcfgfatal_maybefile(maybe_f,l->u.apply.loc,"rsa-private",message,args);
+}
+
+static bool_t postreadcheck_apply(struct rsapriv_load_ctx *l, FILE *f)
+{
+ cfgfile_postreadcheck(l->u.apply.loc,f);
+ return True;
+}
+
+static list_t *rsapriv_apply(closure_t *self, struct cloc loc, dict_t *context,
+ list_t *args)
+{
+ struct rsapriv *st;
+ item_t *i;
+ cstring_t filename;
+ FILE *f;
+ struct rsapriv_load_ctx l[1];
+
+ l->verror=verror_cfgfatal;
+ l->postreadcheck=postreadcheck_apply;
+ l->u.apply.loc=loc;
+
+ /* Argument is filename pointing to SSH1 private key file */
+ i=list_elem(args,0);
+ if (i) {
+ if (i->type!=t_string) {
+ cfgfatal(i->loc,"rsa-private","first argument must be a string\n");
+ }
+ filename=i->data.string;
+ } else {
+ filename=NULL; /* Make compiler happy */
+ cfgfatal(i->loc,"rsa-private","you must provide a filename\n");
+ }
+
+ f=fopen(filename,"rb");
+ if (!f) {
+ if (just_check_config) {
+ Message(M_WARNING,"rsa-private (%s:%d): cannot open keyfile "
+ "\"%s\"; assuming it's valid while we check the "
+ "rest of the configuration\n",loc.file,loc.line,filename);
+ } else {
+ fatal_perror("rsa-private (%s:%d): cannot open file \"%s\"",
+ loc.file,loc.line,filename);
+ }
+ }
+
+ bool_t do_validity_check=True;
+ i=list_elem(args,1);
+ if (i && i->type==t_bool && i->data.bool==False) {
+ Message(M_INFO,"rsa-private (%s:%d): skipping RSA key validity "
+ "check\n",loc.file,loc.line);
+ do_validity_check=False;
+ }
+
+ st=rsa_loadpriv_core(l,f,loc,do_validity_check);
+ fclose(f);
return new_closure(&st->cl);
}