/*
   GSS-PROXY

   Copyright (C) 2012 Red Hat, Inc.
   Copyright (C) 2012 Simo Sorce <simo.sorce@redhat.com>

   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.
*/

#include "gss_plugin.h"
#include <time.h>

OM_uint32 gssi_export_sec_context(OM_uint32 *minor_status,
                                  gss_ctx_id_t *context_handle,
                                  gss_buffer_t interprocess_token)
{
    struct gpp_context_handle *ctx;
    gss_buffer_desc output_token;
    OM_uint32 maj, min;

    GSSI_TRACE();

    ctx = (struct gpp_context_handle *)context_handle;
    if (!ctx) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote && !ctx->local) {
        maj = gpp_remote_to_local_ctx(&min, &ctx->remote, &ctx->local);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            return maj;
        }
    }

    maj = gss_export_sec_context(minor_status, &ctx->local,
                                 interprocess_token);

    if (maj == GSS_S_COMPLETE && ctx->remote) {
        (void)gpm_delete_sec_context(&min, &ctx->remote, &output_token);
    }

    return maj;
}

OM_uint32 gssi_import_sec_context(OM_uint32 *minor_status,
                                  gss_buffer_t interprocess_token,
                                  gss_ctx_id_t *context_handle)
{
    GSSI_TRACE();
    return GSS_S_UNAVAILABLE;
}

OM_uint32 gssi_import_sec_context_by_mech(OM_uint32 *minor_status,
                                          gss_OID mech_type,
                                          gss_buffer_t interprocess_token,
                                          gss_ctx_id_t *context_handle)
{
    struct gpp_context_handle *ctx;
    gss_buffer_desc wrap_token = {0};
    OM_uint32 maj, min = 0;

    GSSI_TRACE();

    ctx = calloc(1, sizeof(struct gpp_context_handle));
    if (!ctx) {
        *minor_status = 0;
        return GSS_S_FAILURE;
    }

    /* NOTE: it makes no sense to import a context remotely atm,
     * so we only handle the local case for now. */
    maj = gpp_wrap_sec_ctx_token(&min, mech_type,
                                 interprocess_token, &wrap_token);
    if (maj != GSS_S_COMPLETE) {
        goto done;
    }

    maj = gss_import_sec_context(&min, &wrap_token, &ctx->local);

done:
    *minor_status = gpp_map_error(min);
    if (maj == GSS_S_COMPLETE) {
        *context_handle = (gss_ctx_id_t)ctx;
    } else {
        free(ctx);
    }
    (void)gss_release_buffer(&min, &wrap_token);
    return maj;
}

OM_uint32 gssi_process_context_token(OM_uint32 *minor_status,
                                     gss_ctx_id_t context_handle,
                                     gss_buffer_t token_buffer)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;

    GSSI_TRACE();

    ctx = (struct gpp_context_handle *)context_handle;
    if (!ctx) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote && !ctx->local) {
        maj = gpp_remote_to_local_ctx(&min, &ctx->remote, &ctx->local);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            return maj;
        }
    }

    return gss_process_context_token(minor_status, ctx->local, token_buffer);
}

OM_uint32 gssi_context_time(OM_uint32 *minor_status,
                            gss_ctx_id_t context_handle,
                            OM_uint32 *time_rec)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;

    GSSI_TRACE();

    *minor_status = 0;

    ctx = (struct gpp_context_handle *)context_handle;
    if (!ctx) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote) {
        OM_uint32 lifetime;
        maj = gpm_inquire_context(&min, ctx->remote, NULL, NULL,
                                  &lifetime, NULL, NULL, NULL, NULL);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            return maj;
        }
        if (lifetime > 0) {
            *time_rec = lifetime;
            return GSS_S_COMPLETE;
        } else {
            *time_rec = 0;
            return GSS_S_CONTEXT_EXPIRED;
        }
    } else if (ctx->local) {
        return gss_context_time(minor_status, ctx->local, time_rec);
    } else {
        return GSS_S_NO_CONTEXT;
    }
}

OM_uint32 gssi_inquire_context(OM_uint32 *minor_status,
                              gss_ctx_id_t context_handle,
                              gss_name_t *src_name,
                              gss_name_t *targ_name,
                              OM_uint32 *lifetime_rec,
                              gss_OID *mech_type,
                              OM_uint32 *ctx_flags,
                              int *locally_initiated,
                              int *open)
{
    struct gpp_context_handle *ctx_handle;
    struct gpp_name_handle *s_name = NULL;
    struct gpp_name_handle *t_name = NULL;
    gss_OID mech_oid;
    OM_uint32 maj, min;

    GSSI_TRACE();

    if (!context_handle) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    ctx_handle = (struct gpp_context_handle *)context_handle;
    if (!ctx_handle->local &&
        !ctx_handle->remote) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    if (src_name) {
        s_name = calloc(1, sizeof(struct gpp_name_handle));
        if (!s_name) {
            min = ENOMEM;
            maj = GSS_S_FAILURE;
            goto done;
        }
    }
    if (targ_name) {
        t_name = calloc(1, sizeof(struct gpp_name_handle));
        if (!t_name) {
            min = ENOMEM;
            maj = GSS_S_FAILURE;
            goto done;
        }
    }

    if (ctx_handle->local) {
        maj = gss_inquire_context(&min,
                                  ctx_handle->local,
                                  s_name ? &s_name->local : NULL,
                                  s_name ? &t_name->local : NULL,
                                  lifetime_rec,
                                  &mech_oid,
                                  ctx_flags,
                                  locally_initiated,
                                  open);
    } else {
        maj = gpm_inquire_context(&min,
                                  ctx_handle->remote,
                                  s_name ? &s_name->remote : NULL,
                                  s_name ? &t_name->remote : NULL,
                                  lifetime_rec,
                                  &mech_oid,
                                  ctx_flags,
                                  locally_initiated,
                                  open);
    }

    if (maj != GSS_S_COMPLETE) {
        goto done;
    }

    if (s_name) {
        maj = gpp_copy_oid(&min, mech_oid, &s_name->mech_type);
        if (maj != GSS_S_COMPLETE) {
            goto done;
        }
    }

    if (t_name) {
        maj = gpp_copy_oid(&min, mech_oid, &t_name->mech_type);
        if (maj != GSS_S_COMPLETE) {
            goto done;
        }
    }

done:
    *minor_status = gpp_map_error(min);
    if (maj == GSS_S_COMPLETE) {
        if (mech_type) {
            *mech_type = mech_oid;
        } else {
            (void)gss_release_oid(&min, &mech_oid);
        }
        if (src_name) {
            *src_name = (gss_name_t)s_name;
        }
        if (targ_name) {
            *targ_name = (gss_name_t)t_name;
        }
    } else {
        (void)gss_release_oid(&min, &mech_oid);
        (void)gssi_release_name(&min, (gss_name_t *)&s_name);
        (void)gssi_release_name(&min, (gss_name_t *)&t_name);
    }
    return maj;
}

OM_uint32 gssi_inquire_sec_context_by_oid(OM_uint32 *minor_status,
                                          const gss_ctx_id_t context_handle,
                                          const gss_OID desired_object,
                                          gss_buffer_set_t *data_set)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;

    GSSI_TRACE();

    ctx = (struct gpp_context_handle *)context_handle;
    if (!ctx) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote && !ctx->local) {
        maj = gpp_remote_to_local_ctx(&min, &ctx->remote, &ctx->local);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            return maj;
        }
    }

    return gss_inquire_sec_context_by_oid(minor_status, ctx->local,
                                          desired_object, data_set);
}

OM_uint32 gssi_set_sec_context_option(OM_uint32 *minor_status,
                                      gss_ctx_id_t *context_handle,
                                      const gss_OID desired_object,
                                      const gss_buffer_t value)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;

    GSSI_TRACE();

    if (*context_handle) {
        ctx = (struct gpp_context_handle *)(*context_handle);
    } else {
        ctx = calloc(1, sizeof(struct gpp_context_handle));
        if (!ctx) {
            *minor_status = 0;
            return GSS_S_FAILURE;
        }
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote && !ctx->local) {
        maj = gpp_remote_to_local_ctx(&min, &ctx->remote, &ctx->local);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            goto done;
        }
    }

    maj = gss_set_sec_context_option(minor_status, &ctx->local,
                                     desired_object, value);
done:
    *context_handle = (gss_ctx_id_t)ctx;
    if (maj != GSS_S_COMPLETE) {
        (void)gssi_delete_sec_context(&min, context_handle, NULL);
    }
    return maj;
}

OM_uint32 gssi_delete_sec_context(OM_uint32 *minor_status,
                                  gss_ctx_id_t *context_handle,
                                  gss_buffer_t output_token)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;
    OM_uint32 rmaj = GSS_S_COMPLETE;

    GSSI_TRACE();

    ctx = (struct gpp_context_handle *)*context_handle;

    *context_handle = GSS_C_NO_CONTEXT;

    if (ctx->local) {
        maj = gss_delete_sec_context(&min, &ctx->local, output_token);
        if (maj != GSS_S_COMPLETE) {
            rmaj = maj;
            *minor_status = gpp_map_error(min);
        }
    }

    if (ctx->remote) {
        maj = gpm_delete_sec_context(&min, &ctx->remote, output_token);
        if (maj && rmaj == GSS_S_COMPLETE) {
            rmaj = maj;
            *minor_status = gpp_map_error(min);
        }
    }

    return rmaj;
}

OM_uint32 gssi_pseudo_random(OM_uint32 *minor_status,
                             gss_ctx_id_t context_handle,
                             int prf_key,
                             const gss_buffer_t prf_in,
                             ssize_t desired_output_len,
                             gss_buffer_t prf_out)
{
    struct gpp_context_handle *ctx;
    OM_uint32 maj, min;

    GSSI_TRACE();

    ctx = (struct gpp_context_handle *)context_handle;
    if (!ctx) {
        return GSS_S_CALL_INACCESSIBLE_READ;
    }

    /* for now we have support only for some specific known
     * mechanisms for which we can export/import the context */
    if (ctx->remote && !ctx->local) {
        maj = gpp_remote_to_local_ctx(&min, &ctx->remote, &ctx->local);
        if (maj != GSS_S_COMPLETE) {
            *minor_status = gpp_map_error(min);
            return maj;
        }
    }

    return gss_pseudo_random(minor_status,
                             ctx->local, prf_key, prf_in,
                             desired_output_len, prf_out);
}