summaryrefslogtreecommitdiff
path: root/src/keytrans
diff options
context:
space:
mode:
Diffstat (limited to 'src/keytrans')
-rw-r--r--src/keytrans/Makefile12
-rw-r--r--src/keytrans/gnutls-helpers.c446
-rw-r--r--src/keytrans/gnutls-helpers.h78
-rw-r--r--src/keytrans/openpgp2ssh.c437
4 files changed, 973 insertions, 0 deletions
diff --git a/src/keytrans/Makefile b/src/keytrans/Makefile
new file mode 100644
index 0000000..79602ef
--- /dev/null
+++ b/src/keytrans/Makefile
@@ -0,0 +1,12 @@
+all: openpgp2ssh
+
+openpgp2ssh: openpgp2ssh.c gnutls-helpers.o
+ gcc -g -Wall --pedantic -o openpgp2ssh openpgp2ssh.c `libgnutls-config --libs --cflags` gnutls-helpers.o
+
+%.o: %.c
+ gcc -g -Wall --pedantic -o $@ -c $<
+
+clean:
+ rm -f openpgp2ssh *.o
+
+.PHONY: clean all
diff --git a/src/keytrans/gnutls-helpers.c b/src/keytrans/gnutls-helpers.c
new file mode 100644
index 0000000..5b4c46a
--- /dev/null
+++ b/src/keytrans/gnutls-helpers.c
@@ -0,0 +1,446 @@
+/* Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net> */
+/* Date: Fri, 04 Apr 2008 19:31:16 -0400 */
+/* License: GPL v3 or later */
+
+#include "gnutls-helpers.h"
+/* for htonl() */
+#include <arpa/inet.h>
+
+/* for setlocale() */
+#include <locale.h>
+
+/* for isalnum() */
+#include <ctype.h>
+
+/* for exit() */
+#include <unistd.h>
+
+#include <assert.h>
+
+/* higher levels allow more frivolous error messages through.
+ this is set with the MONKEYSPHERE_DEBUG variable */
+static int loglevel = 0;
+
+void err(int level, const char* fmt, ...) {
+ va_list ap;
+ if (level > loglevel)
+ return;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fflush(stderr);
+}
+
+void logfunc(int level, const char* string) {
+ fprintf(stderr, "GnuTLS Logging (%d): %s\n", level, string);
+}
+
+void init_keyid(gnutls_openpgp_keyid_t keyid) {
+ memset(keyid, 'x', sizeof(gnutls_openpgp_keyid_t));
+}
+
+
+
+void make_keyid_printable(printable_keyid out, gnutls_openpgp_keyid_t keyid)
+{
+ assert(sizeof(out) >= 2*sizeof(keyid));
+ hex_print_data((char*)out, (const char*)keyid, sizeof(keyid));
+}
+
+/* you must have twice as many bytes in the out buffer as in the in buffer */
+void hex_print_data(char* out, const char* in, size_t incount)
+{
+ static const char hex[16] = "0123456789ABCDEF";
+ unsigned int inix = 0, outix = 0;
+
+ while (inix < incount) {
+ out[outix] = hex[(in[inix] >> 4) & 0x0f];
+ out[outix + 1] = hex[in[inix] & 0x0f];
+ inix++;
+ outix += 2;
+ }
+}
+
+unsigned char hex2bin(unsigned char x) {
+ if ((x >= '0') && (x <= '9'))
+ return x - '0';
+ if ((x >= 'A') && (x <= 'F'))
+ return 10 + x - 'A';
+ if ((x >= 'a') && (x <= 'f'))
+ return 10 + x - 'a';
+ return 0xff;
+}
+
+void collapse_printable_keyid(gnutls_openpgp_keyid_t out, printable_keyid in) {
+ unsigned int pkix = 0, outkix = 0;
+
+ while (pkix < sizeof(printable_keyid)) {
+ unsigned hi = hex2bin(in[pkix]);
+ unsigned lo = hex2bin(in[pkix + 1]);
+ if (hi == 0xff) {
+ err(0, "character '%c' is not a hex char\n", in[pkix]);
+ exit(1);
+ }
+ if (lo == 0xff) {
+ err(0, "character '%c' is not a hex char\n", in[pkix + 1]);
+ exit(1);
+ }
+ out[outkix] = lo | (hi << 4);
+
+ pkix += 2;
+ outkix++;
+ }
+}
+
+int convert_string_to_keyid(gnutls_openpgp_keyid_t out, const char* str) {
+ printable_keyid p;
+ int ret;
+
+ ret = convert_string_to_printable_keyid(p, str);
+ if (ret == 0)
+ collapse_printable_keyid(out, p);
+ return ret;
+}
+int convert_string_to_printable_keyid(printable_keyid pkeyid, const char* str) {
+ int arglen, x;
+ arglen = 0;
+ x = 0;
+ while ((arglen <= sizeof(printable_keyid)) &&
+ (str[x] != '\0')) {
+ if (isxdigit(str[x])) {
+ if (arglen == sizeof(printable_keyid)) {
+ err(0, "There are more than %d hex digits in the keyid '%s'\n", sizeof(printable_keyid), str);
+ return 1;
+ }
+ pkeyid[arglen] = str[x];
+ arglen++;
+ }
+ x++;
+ }
+
+ if (arglen != sizeof(printable_keyid)) {
+ err(0, "Keyid '%s' is not %d hex digits in length\n", str, sizeof(printable_keyid));
+ return 1;
+ }
+ return 0;
+}
+
+
+
+int init_gnutls() {
+ const char* version = NULL;
+ const char* debug_string = NULL;
+ int ret;
+
+ if (debug_string = getenv("MONKEYSPHERE_DEBUG"), debug_string) {
+ loglevel = atoi(debug_string);
+ }
+
+ if (ret = gnutls_global_init(), ret) {
+ err(0, "Failed to do gnutls_global_init() (error: %d)\n", ret);
+ return 1;
+ }
+
+ version = gnutls_check_version(NULL);
+
+ if (version)
+ err(1, "gnutls version: %s\n", version);
+ else {
+ err(0, "no gnutls version found!\n");
+ return 1;
+ }
+
+ gnutls_global_set_log_function(logfunc);
+
+ gnutls_global_set_log_level(loglevel);
+ err(1, "set log level to %d\n", loglevel);
+
+ return 0;
+}
+
+void init_datum(gnutls_datum_t* d) {
+ d->data = NULL;
+ d->size = 0;
+}
+void copy_datum(gnutls_datum_t* dest, const gnutls_datum_t* src) {
+ dest->data = gnutls_realloc(dest->data, src->size);
+ dest->size = src->size;
+ memcpy(dest->data, src->data, src->size);
+}
+int compare_data(const gnutls_datum_t* a, const gnutls_datum_t* b) {
+ if (a->size > b->size) {
+ err(0,"a is larger\n");
+ return 1;
+ }
+ if (a->size < b->size) {
+ err(0,"b is larger\n");
+ return -1;
+ }
+ return memcmp(a->data, b->data, a->size);
+}
+void free_datum(gnutls_datum_t* d) {
+ gnutls_free(d->data);
+ d->data = NULL;
+ d->size = 0;
+}
+
+/* read the passed-in string, store in a single datum */
+int set_datum_string(gnutls_datum_t* d, const char* s) {
+ unsigned int x = strlen(s)+1;
+ unsigned char* c = NULL;
+
+ c = gnutls_realloc(d->data, x);
+ if (NULL == c)
+ return -1;
+ d->data = c;
+ d->size = x;
+ memcpy(d->data, s, x);
+ return 0;
+}
+
+/* read the passed-in file descriptor until EOF, store in a single
+ datum */
+int set_datum_fd(gnutls_datum_t* d, int fd) {
+ unsigned int bufsize = 1024;
+ unsigned int len = 0;
+
+ FILE* f = fdopen(fd, "r");
+ if (bufsize > d->size) {
+ bufsize = 1024;
+ d->data = gnutls_realloc(d->data, bufsize);
+ if (d->data == NULL) {
+ err(0,"out of memory!\n");
+ return -1;
+ }
+ d->size = bufsize;
+ } else {
+ bufsize = d->size;
+ }
+ f = fdopen(fd, "r");
+ if (NULL == f) {
+ err(0,"could not fdopen FD %d\n", fd);
+ }
+ clearerr(f);
+ while (!feof(f) && !ferror(f)) {
+ if (len == bufsize) {
+ /* allocate more space by doubling: */
+ bufsize *= 2;
+ d->data = gnutls_realloc(d->data, bufsize);
+ if (d->data == NULL) {
+ err(0,"out of memory!\n");
+ return -1;
+ };
+ d->size = bufsize;
+ }
+ len += fread(d->data + len, 1, bufsize - len, f);
+ /* err(0,"read %d bytes\n", len); */
+ }
+ if (ferror(f)) {
+ err(0,"Error reading from fd %d (error: %d) (error: %d '%s')\n", fd, ferror(f), errno, strerror(errno));
+ return -1;
+ }
+
+ /* touch up buffer size to match reality: */
+ d->data = gnutls_realloc(d->data, len);
+ d->size = len;
+ return 0;
+}
+
+/* read the file indicated (by name) in the fname parameter. store
+ its entire contents in a single datum. */
+int set_datum_file(gnutls_datum_t* d, const char* fname) {
+ struct stat sbuf;
+ unsigned char* c = NULL;
+ FILE* file = NULL;
+ size_t x = 0;
+
+ if (0 != stat(fname, &sbuf)) {
+ err(0,"failed to stat '%s'\n", fname);
+ return -1;
+ }
+
+ c = gnutls_realloc(d->data, sbuf.st_size);
+ if (NULL == c) {
+ err(0,"failed to allocate %d bytes for '%s'\n", sbuf.st_size, fname);
+ return -1;
+ }
+
+ d->data = c;
+ d->size = sbuf.st_size;
+ file = fopen(fname, "r");
+ if (NULL == file) {
+ err(0,"failed to open '%s' for reading\n", fname);
+ return -1;
+ }
+
+ x = fread(d->data, d->size, 1, file);
+ if (x != 1) {
+ err(0,"tried to read %d bytes, read %d instead from '%s'\n", d->size, x, fname);
+ fclose(file);
+ return -1;
+ }
+ fclose(file);
+ return 0;
+}
+
+int write_datum_fd(int fd, const gnutls_datum_t* d) {
+ if (d->size != write(fd, d->data, d->size)) {
+ err(0,"failed to write body of datum.\n");
+ return -1;
+ }
+ return 0;
+}
+
+
+int write_datum_fd_with_length(int fd, const gnutls_datum_t* d) {
+ uint32_t len;
+ int looks_negative = (d->data[0] & 0x80);
+ unsigned char zero = 0;
+
+ /* if the first bit is 1, then the datum will appear negative in the
+ MPI encoding style used by OpenSSH. In that case, we'll increase
+ the length by one, and dump out one more byte */
+
+ if (looks_negative) {
+ len = htonl(d->size + 1);
+ } else {
+ len = htonl(d->size);
+ }
+ if (write(fd, &len, sizeof(len)) != sizeof(len)) {
+ err(0,"failed to write size of datum.\n");
+ return -2;
+ }
+ if (looks_negative) {
+ if (write(fd, &zero, 1) != 1) {
+ err(0,"failed to write padding byte for MPI.\n");
+ return -2;
+ }
+ }
+ return write_datum_fd(fd, d);
+}
+
+int write_data_fd_with_length(int fd, const gnutls_datum_t** d, unsigned int num) {
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < num; i++)
+ if (ret = write_datum_fd_with_length(fd, d[i]), ret != 0)
+ return ret;
+
+ return 0;
+}
+
+
+int datum_from_string(gnutls_datum_t* d, const char* str) {
+ d->size = strlen(str);
+ d->data = gnutls_realloc(d->data, d->size);
+ if (d->data == 0)
+ return ENOMEM;
+ memcpy(d->data, str, d->size);
+ return 0;
+}
+
+
+int create_writing_pipe(pid_t* pid, const char* path, char* const argv[]) {
+ int p[2];
+ int ret;
+
+ if (pid == NULL) {
+ err(0,"bad pointer passed to create_writing_pipe()\n");
+ return -1;
+ }
+
+ if (ret = pipe(p), ret == -1) {
+ err(0,"failed to create a pipe (error: %d \"%s\")\n", errno, strerror(errno));
+ return -1;
+ }
+
+ *pid = fork();
+ if (*pid == -1) {
+ err(0,"Failed to fork (error: %d \"%s\")\n", errno, strerror(errno));
+ return -1;
+ }
+ if (*pid == 0) { /* this is the child */
+ close(p[1]); /* close unused write end */
+
+ if (0 != dup2(p[0], 0)) { /* map the reading end into stdin */
+ err(0,"Failed to transfer reading file descriptor to stdin (error: %d \"%s\")\n", errno, strerror(errno));
+ exit(1);
+ }
+ execv(path, argv);
+ err(0,"exec %s failed (error: %d \"%s\")\n", path, errno, strerror(errno));
+ /* close the open file descriptors */
+ close(p[0]);
+ close(0);
+
+ exit(1);
+ } else { /* this is the parent */
+ close(p[0]); /* close unused read end */
+ return p[1];
+ }
+}
+
+int validate_ssh_host_userid(const char* userid) {
+ char* oldlocale = setlocale(LC_ALL, "C");
+
+ /* choke if userid does not match the expected format
+ ("ssh://fully.qualified.domain.name") */
+ if (strncmp("ssh://", userid, strlen("ssh://")) != 0) {
+ err(0,"The user ID should start with ssh:// for a host key\n");
+ goto fail;
+ }
+ /* so that isalnum will work properly */
+ userid += strlen("ssh://");
+ while (0 != (*userid)) {
+ if (!isalnum(*userid)) {
+ err(0,"label did not start with a letter or a digit! (%s)\n", userid);
+ goto fail;
+ }
+ userid++;
+ while (isalnum(*userid) || ('-' == (*userid)))
+ userid++;
+ if (('.' == (*userid)) || (0 == (*userid))) { /* clean end of label:
+ check last char
+ isalnum */
+ if (!isalnum(*(userid - 1))) {
+ err(0,"label did not end with a letter or a digit!\n");
+ goto fail;
+ }
+ if ('.' == (*userid)) /* advance to the start of the next label */
+ userid++;
+ } else {
+ err(0,"invalid character in domain name: %c\n", *userid);
+ goto fail;
+ }
+ }
+ /* ensure that the last character is valid: */
+ if (!isalnum(*(userid - 1))) {
+ err(0,"hostname did not end with a letter or a digit!\n");
+ goto fail;
+ }
+ /* FIXME: fqdn's can be unicode now, thanks to RFC 3490 -- how do we
+ make sure that we've got an OK string? */
+
+ return 0;
+
+ fail:
+ setlocale(LC_ALL, oldlocale);
+ return 1;
+}
+
+/* http://tools.ietf.org/html/rfc4880#section-5.5.2 */
+size_t get_openpgp_mpi_size(gnutls_datum_t* d) {
+ return 2 + d->size;
+}
+
+int write_openpgp_mpi_to_fd(int fd, gnutls_datum_t* d) {
+ uint16_t x;
+
+ x = d->size * 8;
+ x = htons(x);
+
+ write(fd, &x, sizeof(x));
+ write(fd, d->data, d->size);
+
+ return 0;
+}
diff --git a/src/keytrans/gnutls-helpers.h b/src/keytrans/gnutls-helpers.h
new file mode 100644
index 0000000..f196456
--- /dev/null
+++ b/src/keytrans/gnutls-helpers.h
@@ -0,0 +1,78 @@
+/* Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net> */
+/* Date: Fri, 04 Apr 2008 19:31:16 -0400 */
+/* License: GPL v3 or later */
+
+
+#include <gnutls/gnutls.h>
+#include <gnutls/openpgp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+/* Functions to help dealing with GnuTLS for monkeysphere key
+ translation projects: */
+
+/* set everything up, including logging levels. Return 0 on
+ success */
+int init_gnutls();
+
+/* logging and output functions: */
+
+void err(int level, const char* fmt, ...);
+void logfunc(int level, const char* string);
+
+/* basic datum manipulations: */
+
+void init_datum(gnutls_datum_t* d);
+void copy_datum(gnutls_datum_t* dest, const gnutls_datum_t* src);
+int compare_data(const gnutls_datum_t* a, const gnutls_datum_t* b);
+void free_datum(gnutls_datum_t* d);
+int write_datum_fd(int fd, const gnutls_datum_t* d);
+int write_datum_fd_with_length(int fd, const gnutls_datum_t* d);
+int write_data_fd_with_length(int fd, const gnutls_datum_t** d, unsigned int num);
+
+/* set up a datum from a null-terminated string */
+int datum_from_string(gnutls_datum_t* d, const char* str);
+
+/* keyid manipulations: */
+typedef unsigned char printable_keyid[16];
+
+void init_keyid(gnutls_openpgp_keyid_t keyid);
+void make_keyid_printable(printable_keyid out, gnutls_openpgp_keyid_t keyid);
+void collapse_printable_keyid(gnutls_openpgp_keyid_t out, printable_keyid in);
+int convert_string_to_keyid(gnutls_openpgp_keyid_t out, const char* str);
+int convert_string_to_printable_keyid(printable_keyid out, const char* str);
+
+/* you must have twice as many bytes in the out buffer as in the in buffer */
+void hex_print_data(char* out, const char* in, size_t incount);
+
+/* functions to get data into datum objects: */
+
+/* read the passed-in string, store in a single datum */
+int set_datum_string(gnutls_datum_t* d, const char* s);
+
+/* read the passed-in file descriptor until EOF, store in a single
+ datum */
+int set_datum_fd(gnutls_datum_t* d, int fd);
+
+/* read the file indicated (by name) in the fname parameter. store
+ its entire contents in a single datum. */
+int set_datum_file(gnutls_datum_t* d, const char* fname);
+
+/* set up file descriptor pipe for writing (child process pid gets
+ stored in pid, fd is returned)*/
+int create_writing_pipe(pid_t* pid, const char* path, char* const argv[]);
+
+/* return 0 if userid matches the monkeysphere spec for ssh host user IDs */
+int validate_ssh_host_userid(const char* userid);
+
+/* how many bytes will it take to write out this datum in OpenPGP MPI form? */
+size_t get_openpgp_mpi_size(gnutls_datum_t* d);
+
+/* write the MPI stored in gnutls_datum_t to file descriptor fd: */
+int write_openpgp_mpi_to_fd(int fd, gnutls_datum_t* d);
diff --git a/src/keytrans/openpgp2ssh.c b/src/keytrans/openpgp2ssh.c
new file mode 100644
index 0000000..511af71
--- /dev/null
+++ b/src/keytrans/openpgp2ssh.c
@@ -0,0 +1,437 @@
+#include "gnutls-helpers.h"
+
+#include <gnutls/openpgp.h>
+#include <gnutls/x509.h>
+
+/* for waitpid() */
+#include <sys/types.h>
+#include <sys/wait.h>
+
+/*
+ Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ Date: 2008-06-12 13:47:41-0400
+ License: GPL v3 or later
+
+ monkeysphere key translator: execute this with an OpenPGP key on
+ stdin, (please indicate the specific keyid that you want as the
+ first argument if there are subkeys). At the moment, only public
+ keys and passphraseless secret keys work.
+
+ For secret keys, it will spit out a PEM-encoded version of the key
+ on stdout, which can be fed into ssh-add like this:
+
+ gpg --export-secret-keys $KEYID | openpgp2ssh $KEYID | ssh-add -c /dev/stdin
+
+ For public keys, it will spit out a single line of text that can
+ (with some massaging) be used in an openssh known_hosts or
+ authorized_keys file. For example:
+
+ echo server.example.org $(gpg --export $KEYID | openpgp2ssh $KEYID) >> ~/.ssh/known_hosts
+
+ Requirements: I've only built this so far with GnuTLS v2.3.x.
+ GnuTLS 2.2.x does not contain the appropriate functionality.
+
+ */
+
+
+/* FIXME: keyid should be const as well */
+int convert_private_pgp_to_x509(gnutls_x509_privkey_t* output, const gnutls_openpgp_privkey_t* pgp_privkey, gnutls_openpgp_keyid_t* keyid) {
+ gnutls_datum_t m, e, d, p, q, u, g, y, x;
+ gnutls_pk_algorithm_t pgp_algo;
+ unsigned int pgp_bits;
+ int ret;
+ gnutls_openpgp_keyid_t curkeyid;
+ int subkeyidx;
+ int subkeycount;
+ int found = 0;
+
+ init_datum(&m);
+ init_datum(&e);
+ init_datum(&d);
+ init_datum(&p);
+ init_datum(&q);
+ init_datum(&u);
+ init_datum(&g);
+ init_datum(&y);
+ init_datum(&x);
+
+ subkeycount = gnutls_openpgp_privkey_get_subkey_count(*pgp_privkey);
+ if (subkeycount < 0) {
+ err(0,"Could not determine subkey count (got value %d)\n", subkeycount);
+ return 1;
+ }
+
+ if ((keyid == NULL) &&
+ (subkeycount > 0)) {
+ err(0,"No keyid passed in, but there were %d keys to choose from\n", subkeycount + 1);
+ return 1;
+ }
+
+ if (keyid != NULL) {
+ ret = gnutls_openpgp_privkey_get_key_id(*pgp_privkey, curkeyid);
+ if (ret) {
+ err(0,"Could not get keyid (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ if ((keyid == NULL) || (memcmp(*keyid, curkeyid, sizeof(gnutls_openpgp_keyid_t)) == 0)) {
+ /* we want to export the primary key: */
+ err(0,"exporting primary key\n");
+
+ /* FIXME: this is almost identical to the block below for subkeys.
+ This clumsiness seems inherent in the gnutls OpenPGP API,
+ though. ugh. */
+ pgp_algo = gnutls_openpgp_privkey_get_pk_algorithm(*pgp_privkey, &pgp_bits);
+ if (pgp_algo < 0) {
+ err(0, "failed to get OpenPGP key algorithm (error: %d)\n", pgp_algo);
+ return 1;
+ }
+ if (pgp_algo == GNUTLS_PK_RSA) {
+ err(0,"OpenPGP RSA Key, with %d bits\n", pgp_bits);
+ ret = gnutls_openpgp_privkey_export_rsa_raw(*pgp_privkey, &m, &e, &d, &p, &q, &u);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0, "failed to export RSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+
+ } else if (pgp_algo == GNUTLS_PK_DSA) {
+ err(0,"OpenPGP DSA Key, with %d bits\n", pgp_bits);
+ ret = gnutls_openpgp_privkey_export_dsa_raw(*pgp_privkey, &p, &q, &g, &y, &x);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export DSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ found = 1;
+ } else {
+ /* lets trawl through the subkeys until we find the one we want: */
+ for (subkeyidx = 0; (subkeyidx < subkeycount) && !found; subkeyidx++) {
+ ret = gnutls_openpgp_privkey_get_subkey_id(*pgp_privkey, subkeyidx, curkeyid);
+ if (ret) {
+ err(0,"Could not get keyid of subkey with index %d (error: %d)\n", subkeyidx, ret);
+ return 1;
+ }
+ if (memcmp(*keyid, curkeyid, sizeof(gnutls_openpgp_keyid_t)) == 0) {
+ err(0,"exporting subkey index %d\n", subkeyidx);
+
+ /* FIXME: this is almost identical to the block above for the
+ primary key. */
+ pgp_algo = gnutls_openpgp_privkey_get_subkey_pk_algorithm(*pgp_privkey, subkeyidx, &pgp_bits);
+ if (pgp_algo < 0) {
+ err(0,"failed to get the algorithm of the OpenPGP public key (error: %d)\n", pgp_algo);
+ return pgp_algo;
+ } else if (pgp_algo == GNUTLS_PK_RSA) {
+ err(0,"OpenPGP RSA key, with %d bits\n", pgp_bits);
+ ret = gnutls_openpgp_privkey_export_subkey_rsa_raw(*pgp_privkey, subkeyidx, &m, &e, &d, &p, &q, &u);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export RSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+ } else if (pgp_algo == GNUTLS_PK_DSA) {
+ err(0,"OpenPGP DSA Key, with %d bits\n", pgp_bits);
+ ret = gnutls_openpgp_privkey_export_subkey_dsa_raw(*pgp_privkey, subkeyidx, &p, &q, &g, &y, &x);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export DSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ found = 1;
+ }
+ }
+ }
+
+ if (!found) {
+ err(0,"Could not find key in input\n");
+ return 1;
+ }
+
+ if (pgp_algo == GNUTLS_PK_RSA) {
+ ret = gnutls_x509_privkey_import_rsa_raw (*output, &m, &e, &d, &p, &q, &u);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0, "failed to import RSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+ } else if (pgp_algo == GNUTLS_PK_DSA) {
+ ret = gnutls_x509_privkey_import_dsa_raw (*output, &p, &q, &g, &y, &x);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to import DSA key parameters (error: %d)\n", ret);
+ return 1;
+ }
+ } else {
+ err(0,"OpenPGP Key was not RSA or DSA -- can't deal! (actual algorithm was: %d)\n", pgp_algo);
+ return 1;
+ }
+
+ ret = gnutls_x509_privkey_fix(*output);
+ if (ret != 0) {
+ err(0,"failed to fix up the private key in X.509 format (error: %d)\n", ret);
+ return 1;
+ }
+
+ return 0;
+}
+
+/* FIXME: keyid should be const also */
+int emit_public_openssh_from_pgp(const gnutls_openpgp_crt_t* pgp_crt, gnutls_openpgp_keyid_t* keyid) {
+ gnutls_openpgp_keyid_t curkeyid;
+ int ret;
+ int subkeyidx;
+ int subkeycount;
+ int found = 0;
+ gnutls_datum_t m, e, p, q, g, y, algolabel;
+ unsigned int bits;
+ gnutls_pk_algorithm_t algo;
+ const gnutls_datum_t* all[5];
+ const char* algoname;
+ int mpicount;
+ /* output_data must be at least 2 chars longer than the maximum possible
+ algorithm name: */
+ char output_data[20];
+
+ /* variables for the output conversion: */
+ int pipestatus;
+ int pipefd, child_pid;
+ char* const b64args[] = {"/usr/bin/base64", "--wrap=0", NULL};
+
+ init_datum(&m);
+ init_datum(&e);
+ init_datum(&p);
+ init_datum(&q);
+ init_datum(&g);
+ init_datum(&algolabel);
+
+
+ /* figure out if we've got the right thing: */
+ subkeycount = gnutls_openpgp_crt_get_subkey_count(*pgp_crt);
+ if (subkeycount < 0) {
+ err(0,"Could not determine subkey count (got value %d)\n", subkeycount);
+ return 1;
+ }
+
+ if ((keyid == NULL) &&
+ (subkeycount > 0)) {
+ err(0,"No keyid passed in, but there were %d keys to choose from\n", subkeycount + 1);
+ return 1;
+ }
+
+ if (keyid != NULL) {
+ ret = gnutls_openpgp_crt_get_key_id(*pgp_crt, curkeyid);
+ if (ret) {
+ err(0,"Could not get keyid (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ if ((keyid == NULL) || (memcmp(*keyid, curkeyid, sizeof(gnutls_openpgp_keyid_t)) == 0)) {
+ /* we want to export the primary key: */
+ err(0,"exporting primary key\n");
+
+ /* FIXME: this is almost identical to the block below for subkeys.
+ This clumsiness seems inherent in the gnutls OpenPGP API,
+ though. ugh. */
+ algo = gnutls_openpgp_crt_get_pk_algorithm(*pgp_crt, &bits);
+ if (algo < 0) {
+ err(0,"failed to get the algorithm of the OpenPGP public key (error: %d)\n", algo);
+ return algo;
+ } else if (algo == GNUTLS_PK_RSA) {
+ err(0,"OpenPGP RSA certificate, with %d bits\n", bits);
+ ret = gnutls_openpgp_crt_get_pk_rsa_raw(*pgp_crt, &m, &e);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export RSA certificate parameters (error: %d)\n", ret);
+ return 1;
+ }
+ } else if (algo == GNUTLS_PK_DSA) {
+ err(0,"OpenPGP DSA certificate, with %d bits\n", bits);
+ ret = gnutls_openpgp_crt_get_pk_dsa_raw(*pgp_crt, &p, &q, &g, &y);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export DSA certificate parameters (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ found = 1;
+
+ } else {
+ /* lets trawl through the subkeys until we find the one we want: */
+ for (subkeyidx = 0; (subkeyidx < subkeycount) && !found; subkeyidx++) {
+ ret = gnutls_openpgp_crt_get_subkey_id(*pgp_crt, subkeyidx, curkeyid);
+ if (ret) {
+ err(0,"Could not get keyid of subkey with index %d (error: %d)\n", subkeyidx, ret);
+ return 1;
+ }
+ if (memcmp(*keyid, curkeyid, sizeof(gnutls_openpgp_keyid_t)) == 0) {
+ err(0,"exporting subkey index %d\n", subkeyidx);
+
+ /* FIXME: this is almost identical to the block above for the
+ primary key. */
+ algo = gnutls_openpgp_crt_get_subkey_pk_algorithm(*pgp_crt, subkeyidx, &bits);
+ if (algo < 0) {
+ err(0,"failed to get the algorithm of the OpenPGP public key (error: %d)\n", algo);
+ return algo;
+ } else if (algo == GNUTLS_PK_RSA) {
+ err(0,"OpenPGP RSA certificate, with %d bits\n", bits);
+ ret = gnutls_openpgp_crt_get_subkey_pk_rsa_raw(*pgp_crt, subkeyidx, &m, &e);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export RSA certificate parameters (error: %d)\n", ret);
+ return 1;
+ }
+ } else if (algo == GNUTLS_PK_DSA) {
+ err(0,"OpenPGP DSA certificate, with %d bits\n", bits);
+ ret = gnutls_openpgp_crt_get_subkey_pk_dsa_raw(*pgp_crt, subkeyidx, &p, &q, &g, &y);
+ if (GNUTLS_E_SUCCESS != ret) {
+ err(0,"failed to export DSA certificate parameters (error: %d)\n", ret);
+ return 1;
+ }
+ }
+ found = 1;
+
+ }
+ }
+ }
+
+ if (!found) {
+ err(0,"Could not find key in input\n");
+ return 1;
+ }
+
+ /* if we made it this far, we've got MPIs, and we've got the
+ algorithm, so we just need to emit the info */
+ if (algo == GNUTLS_PK_RSA) {
+ algoname = "ssh-rsa";
+ mpicount = 3;
+
+ all[0] = &algolabel;
+ all[1] = &e;
+ all[2] = &m;
+ } else if (algo == GNUTLS_PK_DSA) {
+ algoname = "ssh-dss";
+ mpicount = 5;
+
+ all[0] = &algolabel;
+ all[1] = &p;
+ all[2] = &q;
+ all[3] = &g;
+ all[4] = &y;
+ } else {
+ err(0,"Key algorithm was neither DSA nor RSA (it was %d). Can't deal. Sorry!\n", algo);
+ return 1;
+ }
+
+ if (ret = datum_from_string(&algolabel, algoname), ret) {
+ err(0,"couldn't label string (error: %d)\n", ret);
+ return ret;
+ }
+
+ snprintf(output_data, sizeof(output_data), "%s ", algoname);
+
+ pipefd = create_writing_pipe(&child_pid, b64args[0], b64args);
+ if (pipefd < 0) {
+ err(0,"failed to create a writing pipe (returned %d)\n", pipefd);
+ return pipefd;
+ }
+
+ write(1, output_data, strlen(output_data));
+
+ if (0 != write_data_fd_with_length(pipefd, all, mpicount)) {
+ err(0,"was not able to write out RSA key data\n");
+ return 1;
+ }
+ close(pipefd);
+ if (child_pid != waitpid(child_pid, &pipestatus, 0)) {
+ err(0,"could not wait for child process to return for some reason.\n");
+ return 1;
+ }
+ if (pipestatus != 0) {
+ err(0,"base64 pipe died with return code %d\n", pipestatus);
+ return pipestatus;
+ }
+
+ write(1, "\n", 1);
+
+ return 0;
+}
+
+int main(int argc, char* argv[]) {
+ gnutls_datum_t data;
+ int ret;
+ gnutls_x509_privkey_t x509_privkey;
+ gnutls_openpgp_privkey_t pgp_privkey;
+ gnutls_openpgp_crt_t pgp_crt;
+
+ char output_data[10240];
+ size_t ods = sizeof(output_data);
+
+ gnutls_openpgp_keyid_t keyid;
+ gnutls_openpgp_keyid_t* use_keyid;
+
+ init_gnutls();
+
+ /* figure out what keyid we should be looking for: */
+ use_keyid = NULL;
+ if (argv[1] != NULL) {
+ ret = convert_string_to_keyid(keyid, argv[1]);
+ if (ret != 0)
+ return ret;
+ use_keyid = &keyid;
+ }
+
+
+ init_datum(&data);
+
+ /* slurp in the key from stdin */
+ if (ret = set_datum_fd(&data, 0), ret) {
+ err(0,"didn't read file descriptor 0\n");
+ return 1;
+ }
+
+
+ if (ret = gnutls_openpgp_privkey_init(&pgp_privkey), ret) {
+ err(0,"Failed to initialized OpenPGP private key (error: %d)\n", ret);
+ return 1;
+ }
+ /* check whether it's a private key or a public key, by trying them: */
+ if ((gnutls_openpgp_privkey_import(pgp_privkey, &data, GNUTLS_OPENPGP_FMT_RAW, NULL, 0) == 0) ||
+ (gnutls_openpgp_privkey_import(pgp_privkey, &data, GNUTLS_OPENPGP_FMT_BASE64, NULL, 0) == 0)) {
+ /* we're dealing with a private key */
+ err(0,"Translating private key\n");
+ if (ret = gnutls_x509_privkey_init(&x509_privkey), ret) {
+ err(0,"Failed to initialize X.509 private key for output (error: %d)\n", ret);
+ return 1;
+ }
+
+ ret = convert_private_pgp_to_x509(&x509_privkey, &pgp_privkey, use_keyid);
+
+ gnutls_openpgp_privkey_deinit(pgp_privkey);
+ if (ret)
+ return ret;
+
+ ret = gnutls_x509_privkey_export (x509_privkey,
+ GNUTLS_X509_FMT_PEM,
+ output_data,
+ &ods);
+ if (ret == 0) {
+ write(1, output_data, ods);
+ }
+ gnutls_x509_privkey_deinit(x509_privkey);
+
+ } else {
+ if (ret = gnutls_openpgp_crt_init(&pgp_crt), ret) {
+ err(0,"Failed to initialized OpenPGP certificate (error: %d)\n", ret);
+ return 1;
+ }
+
+ if ((gnutls_openpgp_crt_import(pgp_crt, &data, GNUTLS_OPENPGP_FMT_RAW) == 0) ||
+ (gnutls_openpgp_crt_import(pgp_crt, &data, GNUTLS_OPENPGP_FMT_BASE64) == 0)) {
+ /* we're dealing with a public key */
+ err(0,"Translating public key\n");
+
+ ret = emit_public_openssh_from_pgp(&pgp_crt, use_keyid);
+
+ } else {
+ /* we have no idea what kind of key this is at all anyway! */
+ err(0,"Input does contain any form of OpenPGP key I recognize.\n");
+ return 1;
+ }
+ }
+
+ gnutls_global_deinit();
+ return 0;
+}
generated by cgit v1.2.3 (git 2.46.0) at 2025-01-27 19:02:13 +0000