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Fix crash while reading unsupported ssh keys.
This bug was found by n-roeser at gmx.net (gnupg-devel@, msgid 4DFC7298.4040509@gmx.net).
This commit is contained in:
Werner Koch
parent
68fb27e7f0
commit
5a4071a273
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@ -1,3 +1,8 @@
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2011-07-22 Werner Koch <wk@g10code.com>
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* command-ssh.c (ssh_receive_key): Do not init comment to an empty
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static string; in the error case it would be freed.
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2011-04-29 Werner Koch <wk@g10code.com>
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* gpg-agent.c: Include estream.h
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@ -69,7 +69,7 @@ static const char sshcontrolblurb[] =
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"# in the SSH protocol. The ssh-add tool may add new entries to this\n"
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"# file to enable them; you may also add them manually. Comment\n"
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"# lines, like this one, as well as empty lines are ignored. Lines do\n"
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"# have a certain length limit but this is not serious limitation as\n"
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"# have a certain length limit but this is not serious limitation as\n"
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"# the format of the entries is fixed and checked by gpg-agent. A\n"
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"# non-comment line starts with optional white spaces, followed by the\n"
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"# keygrip of the key given as 40 hex digits, optionally followed by a\n"
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@ -193,7 +193,7 @@ static gpg_error_t ssh_signature_encoder_dsa (estream_t signature_blob,
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/* Global variables. */
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/* Associating request types with the corresponding request
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handlers. */
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@ -235,7 +235,7 @@ static ssh_key_type_spec_t ssh_key_types[] =
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/*
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General utility functions.
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General utility functions.
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*/
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/* A secure realloc, i.e. it makes sure to allocate secure memory if A
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@ -246,7 +246,7 @@ static void *
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realloc_secure (void *a, size_t n)
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{
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void *p;
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if (a)
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p = gcry_realloc (a, n);
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else
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@ -276,8 +276,8 @@ make_cstring (const char *data, size_t data_n)
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/*
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Primitive I/O functions.
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/*
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Primitive I/O functions.
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*/
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@ -467,7 +467,7 @@ stream_read_cstring (estream_t stream, char **string)
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err = stream_read_string (stream, 0, &buffer, NULL);
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if (err)
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goto out;
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*string = (char *) buffer;
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out:
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@ -504,7 +504,7 @@ stream_write_cstring (estream_t stream, const char *string)
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(const unsigned char *) string, strlen (string));
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return err;
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}
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}
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/* Read an MPI from STREAM, store it in MPINT. Depending on SECURE
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use secure memory. */
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@ -615,7 +615,7 @@ file_to_buffer (const char *filename, unsigned char **buffer, size_t *buffer_n)
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buffer_new = NULL;
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err = 0;
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stream = es_fopen (filename, "r");
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if (! stream)
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{
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@ -681,7 +681,7 @@ open_control_file (FILE **r_fp, int append)
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{
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/* Fixme: "x" is a GNU extension. We might want to use the es_
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functions here. */
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fp = fopen (fname, "wx");
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fp = fopen (fname, "wx");
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if (!fp)
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{
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err = gpg_error (gpg_err_code_from_errno (errno));
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@ -701,8 +701,8 @@ open_control_file (FILE **r_fp, int append)
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xfree (fname);
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return err;
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}
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*r_fp = fp;
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*r_fp = fp;
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return 0;
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}
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@ -713,7 +713,7 @@ open_control_file (FILE **r_fp, int append)
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DISABLED if the found key has been disabled. If R_TTL is not NULL
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a specified TTL for that key is stored there. */
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static gpg_error_t
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search_control_file (FILE *fp, const char *hexgrip,
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search_control_file (FILE *fp, const char *hexgrip,
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int *r_disabled, int *r_ttl)
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{
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int c, i;
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@ -733,7 +733,7 @@ search_control_file (FILE *fp, const char *hexgrip,
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return gpg_error (GPG_ERR_EOF);
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return gpg_error (gpg_err_code_from_errno (errno));
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}
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if (!*line || line[strlen(line)-1] != '\n')
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{
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/* Eat until end of line */
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@ -742,13 +742,13 @@ search_control_file (FILE *fp, const char *hexgrip,
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return gpg_error (*line? GPG_ERR_LINE_TOO_LONG
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: GPG_ERR_INCOMPLETE_LINE);
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}
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/* Allow for empty lines and spaces */
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for (p=line; spacep (p); p++)
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;
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}
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while (!*p || *p == '\n' || *p == '#');
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*r_disabled = 0;
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if (*p == '!')
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{
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@ -776,7 +776,7 @@ search_control_file (FILE *fp, const char *hexgrip,
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if (r_ttl)
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*r_ttl = ttl;
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/* Here is the place to parse flags if we need them. */
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/* Here is the place to parse flags if we need them. */
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return 0; /* Okay: found it. */
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}
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@ -814,7 +814,7 @@ add_control_entry (ctrl_t ctrl, const char *hexgrip, int ttl)
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
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tp->tm_hour, tp->tm_min, tp->tm_sec,
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hexgrip, ttl);
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}
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fclose (fp);
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return 0;
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@ -838,7 +838,7 @@ ttl_from_sshcontrol (const char *hexgrip)
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|| disabled)
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ttl = 0; /* Use the global default if not found or disabled. */
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fclose (fp);
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fclose (fp);
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return ttl;
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}
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@ -849,7 +849,7 @@ ttl_from_sshcontrol (const char *hexgrip)
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/*
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MPI lists.
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MPI lists.
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*/
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@ -886,7 +886,7 @@ ssh_receive_mpint_list (estream_t stream, int secret,
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mpis = NULL;
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err = 0;
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if (secret)
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elems = key_spec.elems_key_secret;
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else
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@ -1008,7 +1008,7 @@ ssh_signature_encoder_dsa (estream_t signature_blob, gcry_mpi_t *mpis)
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err = gpg_error (GPG_ERR_INTERNAL); /* FIXME? */
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break;
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}
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memset (buffer + (i * SSH_DSA_SIGNATURE_PADDING), 0,
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SSH_DSA_SIGNATURE_PADDING - data_n);
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memcpy (buffer + (i * SSH_DSA_SIGNATURE_PADDING)
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@ -1029,8 +1029,8 @@ ssh_signature_encoder_dsa (estream_t signature_blob, gcry_mpi_t *mpis)
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return err;
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}
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/*
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S-Expressions.
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/*
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S-Expressions.
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*/
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@ -1252,7 +1252,7 @@ sexp_key_extract (gcry_sexp_t sexp,
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gcry_sexp_release (value_list);
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gcry_sexp_release (value_pair);
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gcry_sexp_release (comment_list);
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if (err)
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{
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xfree (comment_new);
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@ -1262,7 +1262,7 @@ sexp_key_extract (gcry_sexp_t sexp,
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return err;
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}
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/* Extract the car from SEXP, and create a newly created C-string
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/* Extract the car from SEXP, and create a newly created C-string
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which is to be stored in IDENTIFIER. */
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static gpg_error_t
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sexp_extract_identifier (gcry_sexp_t sexp, char **identifier)
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@ -1275,7 +1275,7 @@ sexp_extract_identifier (gcry_sexp_t sexp, char **identifier)
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identifier_new = NULL;
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err = 0;
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sublist = gcry_sexp_nth (sexp, 1);
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if (! sublist)
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{
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@ -1329,7 +1329,7 @@ ssh_key_type_lookup (const char *ssh_name, const char *name,
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if ((ssh_name && (! strcmp (ssh_name, ssh_key_types[i].ssh_identifier)))
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|| (name && (! strcmp (name, ssh_key_types[i].identifier))))
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break;
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if (i == DIM (ssh_key_types))
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err = gpg_error (GPG_ERR_NOT_FOUND);
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else
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@ -1351,18 +1351,14 @@ ssh_receive_key (estream_t stream, gcry_sexp_t *key_new, int secret,
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int read_comment, ssh_key_type_spec_t *key_spec)
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{
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gpg_error_t err;
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char *key_type;
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char *comment;
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gcry_sexp_t key;
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char *key_type = NULL;
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char *comment = NULL;
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gcry_sexp_t key = NULL;
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ssh_key_type_spec_t spec;
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gcry_mpi_t *mpi_list;
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gcry_mpi_t *mpi_list = NULL;
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const char *elems;
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mpi_list = NULL;
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key_type = NULL;
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comment = "";
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key = NULL;
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err = stream_read_cstring (stream, &key_type);
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if (err)
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goto out;
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@ -1394,20 +1390,19 @@ ssh_receive_key (estream_t stream, gcry_sexp_t *key_new, int secret,
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goto out;
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}
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err = sexp_key_construct (&key, spec, secret, mpi_list, comment);
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err = sexp_key_construct (&key, spec, secret, mpi_list, comment? comment:"");
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if (err)
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goto out;
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if (key_spec)
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*key_spec = spec;
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*key_new = key;
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out:
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mpint_list_free (mpi_list);
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xfree (key_type);
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if (read_comment)
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xfree (comment);
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xfree (comment);
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return err;
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}
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@ -1454,7 +1449,7 @@ ssh_convert_key_to_blob (unsigned char **blob, size_t *blob_size,
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err = gpg_error_from_syserror ();
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goto out;
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}
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err = es_fseek (stream, 0, SEEK_SET);
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if (err)
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goto out;
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@ -1482,7 +1477,7 @@ ssh_convert_key_to_blob (unsigned char **blob, size_t *blob_size,
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return err;
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}
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/* Write the public key KEY_PUBLIC to STREAM in SSH key format. If
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OVERRIDE_COMMENT is not NULL, it will be used instead of the
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@ -1520,14 +1515,14 @@ ssh_send_key_public (estream_t stream, gcry_sexp_t key_public,
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spec.ssh_identifier, mpi_list);
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if (err)
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goto out;
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err = stream_write_string (stream, blob, blob_n);
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if (err)
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goto out;
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err = stream_write_cstring (stream,
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override_comment? override_comment : comment);
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out:
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mpint_list_free (mpi_list);
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@ -1550,7 +1545,7 @@ ssh_read_key_public_from_blob (unsigned char *blob, size_t blob_size,
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gpg_error_t err;
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err = 0;
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blob_stream = es_mopen (NULL, 0, 0, 1, NULL, NULL, "r+");
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if (! blob_stream)
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{
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@ -1714,7 +1709,7 @@ card_key_available (ctrl_t ctrl, gcry_sexp_t *r_pk, char **cardsn)
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/* (Shadow)-key is not available in our key storage. */
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unsigned char *shadow_info;
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unsigned char *tmp;
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shadow_info = make_shadow_info (serialno, authkeyid);
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if (!shadow_info)
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{
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@ -1849,7 +1844,7 @@ ssh_handler_request_identities (ctrl_t ctrl,
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goto out;
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}
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key_directory_n = strlen (key_directory);
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key_path = xtrymalloc (key_directory_n + 46);
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if (! key_path)
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{
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@ -1881,7 +1876,7 @@ ssh_handler_request_identities (ctrl_t ctrl,
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xfree (cardsn);
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if (err)
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goto out;
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key_counter++;
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}
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@ -1921,7 +1916,7 @@ ssh_handler_request_identities (ctrl_t ctrl,
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err = file_to_buffer (key_path, &buffer, &buffer_n);
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if (err)
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goto out;
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err = gcry_sexp_sscan (&key_secret, NULL, (char*)buffer, buffer_n);
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if (err)
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goto out;
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@ -1946,7 +1941,7 @@ ssh_handler_request_identities (ctrl_t ctrl,
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gcry_sexp_release (key_secret);
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key_secret = NULL;
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err = ssh_send_key_public (key_blobs, key_public, NULL);
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if (err)
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goto out;
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@ -1957,7 +1952,7 @@ ssh_handler_request_identities (ctrl_t ctrl,
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key_counter++;
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}
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}
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ret = es_fseek (key_blobs, 0, SEEK_SET);
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if (ret)
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{
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@ -2151,15 +2146,15 @@ data_sign (ctrl_t ctrl, ssh_signature_encoder_t sig_encoder,
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{
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err = gpg_error_from_syserror ();
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goto out;
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}
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}
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err = stream_read_data (stream, sig_blob, sig_blob_n);
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if (err)
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goto out;
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*sig = sig_blob;
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*sig_n = sig_blob_n;
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out:
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if (err)
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|
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@ -2201,7 +2196,7 @@ ssh_handler_sign_request (ctrl_t ctrl, estream_t request, estream_t response)
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key = NULL;
|
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/* Receive key. */
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|
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err = stream_read_string (request, 0, &key_blob, &key_blob_size);
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if (err)
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goto out;
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@ -2246,7 +2241,7 @@ ssh_handler_sign_request (ctrl_t ctrl, estream_t request, estream_t response)
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memcpy (ctrl->keygrip, key_grip, 20);
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|
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err = data_sign (ctrl, spec.signature_encoder, &sig, &sig_n);
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|
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|
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out:
|
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|
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/* Done. */
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|
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@ -2266,7 +2261,7 @@ ssh_handler_sign_request (ctrl_t ctrl, estream_t request, estream_t response)
|
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if (ret_err)
|
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goto leave;
|
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}
|
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|
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|
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leave:
|
||||
|
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gcry_sexp_release (key);
|
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|
|
@ -2295,7 +2290,7 @@ ssh_key_extract_comment (gcry_sexp_t key, char **comment)
|
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err = gpg_error (GPG_ERR_INV_SEXP);
|
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goto out;
|
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}
|
||||
|
||||
|
||||
data = gcry_sexp_nth_data (comment_list, 1, &data_n);
|
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if (! data)
|
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{
|
||||
|
|
@ -2339,7 +2334,7 @@ ssh_key_to_protected_buffer (gcry_sexp_t key, const char *passphrase,
|
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err = gpg_error_from_syserror ();
|
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goto out;
|
||||
}
|
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|
||||
|
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gcry_sexp_sprint (key, GCRYSEXP_FMT_CANON, buffer_new, buffer_new_n);
|
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/* FIXME: guarantee? */
|
||||
|
||||
|
|
@ -2395,7 +2390,7 @@ ssh_identity_register (ctrl_t ctrl, gcry_sexp_t key, int ttl)
|
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if ( !agent_key_available (key_grip_raw) )
|
||||
goto out; /* Yes, key is available. */
|
||||
|
||||
|
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|
||||
err = ssh_key_extract_comment (key, &comment);
|
||||
if (err)
|
||||
goto out;
|
||||
|
|
@ -2471,7 +2466,7 @@ ssh_identity_register (ctrl_t ctrl, gcry_sexp_t key, int ttl)
|
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xfree (pi);
|
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xfree (buffer);
|
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xfree (comment);
|
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xfree (description);
|
||||
xfree (description);
|
||||
|
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return err;
|
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}
|
||||
|
|
@ -2510,7 +2505,7 @@ ssh_handler_add_identity (ctrl_t ctrl, estream_t request, estream_t response)
|
|||
unsigned char b;
|
||||
int confirm;
|
||||
int ttl;
|
||||
|
||||
|
||||
confirm = 0;
|
||||
key = NULL;
|
||||
ttl = 0;
|
||||
|
|
@ -2588,7 +2583,7 @@ ssh_handler_remove_identity (ctrl_t ctrl,
|
|||
|
||||
key_blob = NULL;
|
||||
key = NULL;
|
||||
|
||||
|
||||
err = stream_read_string (request, 0, &key_blob, &key_blob_size);
|
||||
if (err)
|
||||
goto out;
|
||||
|
|
@ -2596,7 +2591,7 @@ ssh_handler_remove_identity (ctrl_t ctrl,
|
|||
err = ssh_read_key_public_from_blob (key_blob, key_blob_size, &key, NULL);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
|
||||
err = ssh_identity_drop (key);
|
||||
|
||||
out:
|
||||
|
|
@ -2622,7 +2617,7 @@ ssh_identities_remove_all (void)
|
|||
|
||||
/* FIXME: shall we remove _all_ cache entries or only those
|
||||
registered through the ssh emulation? */
|
||||
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
@ -2636,7 +2631,7 @@ ssh_handler_remove_all_identities (ctrl_t ctrl,
|
|||
|
||||
(void)ctrl;
|
||||
(void)request;
|
||||
|
||||
|
||||
err = ssh_identities_remove_all ();
|
||||
|
||||
if (! err)
|
||||
|
|
@ -2681,7 +2676,7 @@ ssh_handler_lock (ctrl_t ctrl, estream_t request, estream_t response)
|
|||
|
||||
(void)ctrl;
|
||||
(void)request;
|
||||
|
||||
|
||||
err = ssh_lock ();
|
||||
|
||||
if (! err)
|
||||
|
|
@ -2698,7 +2693,7 @@ ssh_handler_unlock (ctrl_t ctrl, estream_t request, estream_t response)
|
|||
{
|
||||
gpg_error_t ret_err;
|
||||
gpg_error_t err;
|
||||
|
||||
|
||||
(void)ctrl;
|
||||
(void)request;
|
||||
|
||||
|
|
@ -2763,7 +2758,7 @@ ssh_request_process (ctrl_t ctrl, estream_t stream_sock)
|
|||
/* Create memory streams for request/response data. The entire
|
||||
request will be stored in secure memory, since it might contain
|
||||
secret key material. The response does not have to be stored in
|
||||
secure memory, since we never give out secret keys.
|
||||
secure memory, since we never give out secret keys.
|
||||
|
||||
Note: we only have little secure memory, but there is NO
|
||||
possibility of DoS here; only trusted clients are allowed to
|
||||
|
|
@ -2914,7 +2909,7 @@ start_command_handler_ssh (ctrl_t ctrl, gnupg_fd_t sock_client)
|
|||
the current TTY setting, we resort here to use those from startup
|
||||
or those explictly set. */
|
||||
{
|
||||
static const char *names[] =
|
||||
static const char *names[] =
|
||||
{"GPG_TTY", "DISPLAY", "TERM", "XAUTHORITY", "PINENTRY_USER_DATA", NULL};
|
||||
int idx;
|
||||
const char *value;
|
||||
|
|
@ -2923,7 +2918,7 @@ start_command_handler_ssh (ctrl_t ctrl, gnupg_fd_t sock_client)
|
|||
if (!session_env_getenv (ctrl->session_env, names[idx])
|
||||
&& (value = session_env_getenv (opt.startup_env, names[idx])))
|
||||
err = session_env_setenv (ctrl->session_env, names[idx], value);
|
||||
|
||||
|
||||
if (!err && !ctrl->lc_ctype && opt.startup_lc_ctype)
|
||||
if (!(ctrl->lc_ctype = xtrystrdup (opt.startup_lc_ctype)))
|
||||
err = gpg_error_from_syserror ();
|
||||
|
|
@ -2934,7 +2929,7 @@ start_command_handler_ssh (ctrl_t ctrl, gnupg_fd_t sock_client)
|
|||
|
||||
if (err)
|
||||
{
|
||||
log_error ("error setting default session environment: %s\n",
|
||||
log_error ("error setting default session environment: %s\n",
|
||||
gpg_strerror (err));
|
||||
goto out;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user