SSH: Common client code

2 files changed, 347 insertions, 0 deletions

diff --git a/src/sss_client/ssh/sss_ssh.c b/src/sss_client/ssh/sss_ssh.c
new file mode 100644
index 000000000..dbdbbeee8
--- /dev/null
+++ b/src/sss_client/ssh/sss_ssh.c
@@ -0,0 +1,284 @@
+/*
+    Authors:
+        Jan Cholasta <jcholast@redhat.com>
+
+    Copyright (C) 2012 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+#include <talloc.h>
+
+#include <popt.h>
+#include <locale.h>
+#include <libintl.h>
+
+#include "config.h"
+#include "util/crypto/sss_crypto.h"
+#include "sss_client/sss_cli.h"
+#include "sss_client/ssh/sss_ssh.h"
+
+/* FIXME - split from tools_util to create a common function */
+void usage(poptContext pc, const char *error)
+{
+    poptPrintUsage(pc, stderr, 0);
+    if (error) fprintf(stderr, "%s", error);
+}
+
+/* FIXME - split from tools_util to create a common function */
+int set_locale(void)
+{
+    char *c;
+
+    c = setlocale(LC_ALL, "");
+    if (c == NULL) {
+        return EIO;
+    }
+
+    errno = 0;
+    c = bindtextdomain(PACKAGE, LOCALEDIR);
+    if (c == NULL) {
+        return errno;
+    }
+
+    errno = 0;
+    c = textdomain(PACKAGE);
+    if (c == NULL) {
+        return errno;
+    }
+
+    return EOK;
+}
+
+errno_t
+sss_ssh_get_pubkeys(TALLOC_CTX *mem_ctx,
+                    enum sss_cli_command command,
+                    const char *name,
+                    struct sss_ssh_pubkey **pubkeys,
+                    size_t *pubkeys_len)
+{
+    TALLOC_CTX *tmp_ctx;
+    errno_t ret = EOK;
+    uint32_t name_len;
+    size_t req_len;
+    uint8_t *req = NULL;
+    size_t c = 0;
+    struct sss_cli_req_data rd;
+    int req_ret, req_errno;
+    uint8_t *rep = NULL;
+    size_t rep_len;
+    uint32_t count, reserved, len, i;
+    struct sss_ssh_pubkey *result = NULL;
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    /* build request */
+    name_len = strlen(name)+1;
+    req_len = 2*sizeof(uint32_t) + name_len;
+
+    req = talloc_array(tmp_ctx, uint8_t, req_len);
+    if (!req) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    SAFEALIGN_SET_UINT32(req+c, 0, &c);
+    SAFEALIGN_SET_UINT32(req+c, name_len, &c);
+    safealign_memcpy(req+c, name, name_len, &c);
+
+    /* send request */
+    rd.data = req;
+    rd.len = req_len;
+
+    req_ret = sss_ssh_make_request(command, &rd, &rep, &rep_len, &req_errno);
+    if (req_ret != SSS_STATUS_SUCCESS) {
+        ret = EFAULT;
+        goto done;
+    }
+    if (req_errno != EOK) {
+        ret = req_errno;
+        goto done;
+    }
+
+    /* parse reply */
+    c = 0;
+    if (rep_len-c < 2*sizeof(uint32_t)) {
+        ret = EINVAL;
+        goto done;
+    }
+
+    SAFEALIGN_COPY_UINT32(&count, rep+c, &c);
+
+    SAFEALIGN_COPY_UINT32(&reserved, rep+c, &c);
+    if (reserved != 0) {
+        ret = EINVAL;
+        goto done;
+    }
+
+    if (count > 0) {
+        result = talloc_zero_array(tmp_ctx, struct sss_ssh_pubkey, count);
+        if (!result) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+
+    for (i = 0; i < count; i++) {
+        if (rep_len-c < 2*sizeof(uint32_t)) {
+            ret = EINVAL;
+            goto done;
+        }
+
+        SAFEALIGN_COPY_UINT32(&result[i].flags, rep+c, &c);
+        if (result[i].flags != 0) {
+            ret = EINVAL;
+            goto done;
+        }
+
+        SAFEALIGN_COPY_UINT32(&len, rep+c, &c);
+
+        if (rep_len-c < len + sizeof(uint32_t)) {
+            ret = EINVAL;
+            goto done;
+        }
+
+        result[i].name = talloc_array(result, char, len);
+        if (!result[i].name) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        safealign_memcpy(result[i].name, rep+c, len, &c);
+        if (strnlen(result[i].name, len) != len-1) {
+            ret = EINVAL;
+            goto done;
+        }
+
+        SAFEALIGN_COPY_UINT32(&len, rep+c, &c);
+
+        if (rep_len-c < len) {
+            ret = EINVAL;
+            goto done;
+        }
+
+        result[i].key = talloc_array(result, uint8_t, len);
+        if (!result[i].key) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        safealign_memcpy(result[i].key, rep+c, len, &c);
+        result[i].key_len = len;
+    }
+
+    *pubkeys = result ? talloc_steal(mem_ctx, result) : NULL;
+    *pubkeys_len = count;
+
+done:
+    talloc_free(tmp_ctx);
+
+    return ret;
+}
+
+char *
+sss_ssh_get_pubkey_algorithm(TALLOC_CTX *mem_ctx,
+                             struct sss_ssh_pubkey *pubkey)
+{
+    size_t c = 0;
+    uint32_t algo_len;
+    char *algo;
+
+    SAFEALIGN_COPY_UINT32(&algo_len, pubkey->key, &c);
+    algo_len = ntohl(algo_len);
+
+    algo = talloc_zero_array(mem_ctx, char, algo_len+1);
+    if (!algo) {
+        return NULL;
+    }
+
+    memcpy(algo, pubkey->key+c, algo_len);
+
+    return algo;
+}
+
+errno_t
+sss_ssh_format_pubkey(TALLOC_CTX *mem_ctx,
+                      struct sss_ssh_pubkey *pubkey,
+                      enum sss_ssh_pubkey_format format,
+                      char **result)
+{
+    TALLOC_CTX *tmp_ctx;
+    errno_t ret = EOK;
+    char *pk;
+    char *algo;
+    char *out;
+
+    if (!pubkey) {
+        return EINVAL;
+    }
+
+    tmp_ctx = talloc_new(NULL);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    pk = sss_base64_encode(tmp_ctx, pubkey->key, pubkey->key_len);
+    if (!pk) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    switch (format) {
+    case SSS_SSH_FORMAT_RAW:
+        /* base64-encoded key blob */
+
+        out = talloc_steal(mem_ctx, pk);
+
+        break;
+
+    case SSS_SSH_FORMAT_OPENSSH:
+        /* OpenSSH authorized_keys/known_hosts format */
+
+        algo = sss_ssh_get_pubkey_algorithm(tmp_ctx, pubkey);
+        if (!algo) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        out = talloc_asprintf(tmp_ctx, "%s %s %s",
+                              algo, pk, pubkey->name);
+        if (!out) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        talloc_steal(mem_ctx, out);
+
+        break;
+    }
+
+    *result = out;
+
+done:
+    talloc_free(tmp_ctx);
+
+    return ret;
+}
diff --git a/src/sss_client/ssh/sss_ssh.h b/src/sss_client/ssh/sss_ssh.h
new file mode 100644
index 000000000..633c3af7c
--- /dev/null
+++ b/src/sss_client/ssh/sss_ssh.h
@@ -0,0 +1,63 @@
+/*
+    Authors:
+        Jan Cholasta <jcholast@redhat.com>
+
+    Copyright (C) 2012 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _SSS_SSH_H_
+#define _SSS_SSH_H_
+
+void usage(poptContext pc, const char *error);
+int set_locale(void);
+
+#define BAD_POPT_PARAMS(pc, msg, val, label) do { \
+        usage(pc, msg);                           \
+        val = EXIT_FAILURE;                       \
+        goto label;                               \
+} while(0)
+
+struct sss_ssh_pubkey {
+    uint32_t flags;
+    char *name;
+
+    uint8_t *key;
+    size_t key_len;
+};
+
+errno_t
+sss_ssh_get_pubkeys(TALLOC_CTX *mem_ctx,
+                    enum sss_cli_command command,
+                    const char *name,
+                    struct sss_ssh_pubkey **pubkeys,
+                    size_t *pubkeys_len);
+
+char *
+sss_ssh_get_pubkey_algorithm(TALLOC_CTX *mem_ctx,
+                             struct sss_ssh_pubkey *pubkey);
+
+enum sss_ssh_pubkey_format {
+    SSS_SSH_FORMAT_RAW,
+    SSS_SSH_FORMAT_OPENSSH
+};
+
+errno_t
+sss_ssh_format_pubkey(TALLOC_CTX *mem_ctx,
+                      struct sss_ssh_pubkey *pubkey,
+                      enum sss_ssh_pubkey_format format,
+                      char **result);
+
+#endif /* _SSS_SSH_H_ */