diff --git a/common/ssh-utils.c b/common/ssh-utils.c index a75b3c06d..fab798dc7 100644 --- a/common/ssh-utils.c +++ b/common/ssh-utils.c @@ -1,282 +1,282 @@ /* ssh-utils.c - Secure Shell helper functions * Copyright (C) 2011 Free Software Foundation, Inc. * * This file is part of GnuPG. * * This file is free software; you can redistribute it and/or modify * it under the terms of either * * - the GNU Lesser General Public License as published by the Free * Software Foundation; either version 3 of the License, or (at * your option) any later version. * * or * * - 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. * * or both in parallel, as here. * * This file 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, see . */ #include #include #include #include #include #include "util.h" #include "ssh-utils.h" /* Return true if KEYPARMS holds an EdDSA key. */ static int is_eddsa (gcry_sexp_t keyparms) { int result = 0; gcry_sexp_t list; const char *s; size_t n; int i; list = gcry_sexp_find_token (keyparms, "flags", 0); for (i = list ? gcry_sexp_length (list)-1 : 0; i > 0; i--) { s = gcry_sexp_nth_data (list, i, &n); if (!s) continue; /* Not a data element. */ if (n == 5 && !memcmp (s, "eddsa", 5)) { result = 1; break; } } gcry_sexp_release (list); return result; } /* Return the Secure Shell type fingerprint for KEY. The length of the fingerprint is returned at R_LEN and the fingerprint itself at R_FPR. In case of a error code is returned and NULL stored at R_FPR. */ static gpg_error_t get_fingerprint (gcry_sexp_t key, void **r_fpr, size_t *r_len, int as_string) { gpg_error_t err; gcry_sexp_t list = NULL; gcry_sexp_t l2 = NULL; const char *s; char *name = NULL; int idx; const char *elems; gcry_md_hd_t md = NULL; int blobmode = 0; *r_fpr = NULL; *r_len = 0; /* Check that the first element is valid. */ list = gcry_sexp_find_token (key, "public-key", 0); if (!list) list = gcry_sexp_find_token (key, "private-key", 0); if (!list) list = gcry_sexp_find_token (key, "protected-private-key", 0); if (!list) list = gcry_sexp_find_token (key, "shadowed-private-key", 0); if (!list) { err = gpg_err_make (default_errsource, GPG_ERR_UNKNOWN_SEXP); goto leave; } l2 = gcry_sexp_cadr (list); gcry_sexp_release (list); list = l2; l2 = NULL; name = gcry_sexp_nth_string (list, 0); if (!name) { err = gpg_err_make (default_errsource, GPG_ERR_INV_SEXP); goto leave; } err = gcry_md_open (&md, GCRY_MD_MD5, 0); if (err) goto leave; switch (gcry_pk_map_name (name)) { case GCRY_PK_RSA: elems = "en"; gcry_md_write (md, "\0\0\0\x07ssh-rsa", 11); break; case GCRY_PK_DSA: elems = "pqgy"; gcry_md_write (md, "\0\0\0\x07ssh-dss", 11); break; case GCRY_PK_ECC: if (is_eddsa (list)) { elems = "q"; blobmode = 1; /* For now there is just one curve, thus no need to switch on it. */ gcry_md_write (md, "\0\0\0\x0b" "ssh-ed25519", 15); } else { /* We only support the 3 standard curves for now. It is just a quick hack. */ elems = "q"; gcry_md_write (md, "\0\0\0\x13" "ecdsa-sha2-nistp", 20); l2 = gcry_sexp_find_token (list, "curve", 0); if (!l2) elems = ""; else { gcry_free (name); name = gcry_sexp_nth_string (l2, 1); gcry_sexp_release (l2); l2 = NULL; if (!name) elems = ""; else if (!strcmp (name, "NIST P-256")||!strcmp (name, "nistp256")) gcry_md_write (md, "256\0\0\0\x08nistp256", 15); else if (!strcmp (name, "NIST P-384")||!strcmp (name, "nistp384")) - gcry_md_write (md, "384\0\0\0\x08nistp521", 15); + gcry_md_write (md, "384\0\0\0\x08nistp384", 15); else if (!strcmp (name, "NIST P-521")||!strcmp (name, "nistp521")) gcry_md_write (md, "521\0\0\0\x08nistp521", 15); else elems = ""; } if (!*elems) err = gpg_err_make (default_errsource, GPG_ERR_UNKNOWN_CURVE); } break; default: elems = ""; err = gpg_err_make (default_errsource, GPG_ERR_PUBKEY_ALGO); break; } if (err) goto leave; for (idx = 0, s = elems; *s; s++, idx++) { l2 = gcry_sexp_find_token (list, s, 1); if (!l2) { err = gpg_err_make (default_errsource, GPG_ERR_INV_SEXP); goto leave; } if (blobmode) { const char *blob; size_t bloblen; unsigned char lenbuf[4]; blob = gcry_sexp_nth_data (l2, 1, &bloblen); if (!blob) { err = gpg_err_make (default_errsource, GPG_ERR_INV_SEXP); goto leave; } lenbuf[0] = bloblen >> 24; lenbuf[1] = bloblen >> 16; lenbuf[2] = bloblen >> 8; lenbuf[3] = bloblen; gcry_md_write (md, lenbuf, 4); gcry_md_write (md, blob, bloblen); } else { gcry_mpi_t a; unsigned char *buf; size_t buflen; a = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG); gcry_sexp_release (l2); l2 = NULL; if (!a) { err = gpg_err_make (default_errsource, GPG_ERR_INV_SEXP); goto leave; } err = gcry_mpi_aprint (GCRYMPI_FMT_SSH, &buf, &buflen, a); gcry_mpi_release (a); if (err) goto leave; gcry_md_write (md, buf, buflen); gcry_free (buf); } } *r_fpr = gcry_malloc (as_string? 61:20); if (!*r_fpr) { err = gpg_err_make (default_errsource, gpg_err_code_from_syserror ()); goto leave; } if (as_string) { bin2hexcolon (gcry_md_read (md, GCRY_MD_MD5), 16, *r_fpr); *r_len = 3*16+1; strlwr (*r_fpr); } else { memcpy (*r_fpr, gcry_md_read (md, GCRY_MD_MD5), 16); *r_len = 16; } err = 0; leave: gcry_free (name); gcry_sexp_release (l2); gcry_md_close (md); gcry_sexp_release (list); return err; } /* Return the Secure Shell type fingerprint for KEY. The length of the fingerprint is returned at R_LEN and the fingerprint itself at R_FPR. In case of an error an error code is returned and NULL stored at R_FPR. */ gpg_error_t ssh_get_fingerprint (gcry_sexp_t key, void **r_fpr, size_t *r_len) { return get_fingerprint (key, r_fpr, r_len, 0); } /* Return the Secure Shell type fingerprint for KEY as a string. The fingerprint is mallcoed and stored at R_FPRSTR. In case of an error an error code is returned and NULL stored at R_FPRSTR. */ gpg_error_t ssh_get_fingerprint_string (gcry_sexp_t key, char **r_fprstr) { gpg_error_t err; size_t dummy; void *string; err = get_fingerprint (key, &string, &dummy, 1); *r_fprstr = string; return err; }