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-rw-r--r--src/lib/idmap/sss_idmap.c169
-rw-r--r--src/lib/idmap/sss_idmap.h99
-rw-r--r--src/lib/idmap/sss_idmap_private.h20
3 files changed, 287 insertions, 1 deletions
diff --git a/src/lib/idmap/sss_idmap.c b/src/lib/idmap/sss_idmap.c
index 1764b6f4..24506c68 100644
--- a/src/lib/idmap/sss_idmap.c
+++ b/src/lib/idmap/sss_idmap.c
@@ -28,6 +28,7 @@
#include "lib/idmap/sss_idmap.h"
#include "lib/idmap/sss_idmap_private.h"
+#include "util/murmurhash3.h"
#define SID_FMT "%s-%d"
#define SID_STR_MAX_LEN 1024
@@ -198,6 +199,12 @@ enum idmap_error_code sss_idmap_init(idmap_alloc_func *alloc_func,
ctx->alloc_pvt = alloc_pvt;
ctx->free_func = (free_func == NULL) ? default_free : free_func;
+ /* Set default values. */
+ ctx->idmap_opts.autorid_mode = SSS_IDMAP_DEFAULT_AUTORID;
+ ctx->idmap_opts.idmap_lower = SSS_IDMAP_DEFAULT_LOWER;
+ ctx->idmap_opts.idmap_upper = SSS_IDMAP_DEFAULT_UPPER;
+ ctx->idmap_opts.rangesize = SSS_IDMAP_DEFAULT_RANGESIZE;
+
*_ctx = ctx;
return IDMAP_SUCCESS;
@@ -225,6 +232,104 @@ enum idmap_error_code sss_idmap_free(struct sss_idmap_ctx *ctx)
return IDMAP_SUCCESS;
}
+enum idmap_error_code sss_idmap_calculate_range(struct sss_idmap_ctx *ctx,
+ const char *dom_sid,
+ id_t *slice_num,
+ struct sss_idmap_range *_range)
+{
+ id_t max_slices;
+ id_t orig_slice;
+ id_t new_slice;
+ id_t min;
+ id_t max;
+ id_t idmap_lower;
+ id_t idmap_upper;
+ id_t rangesize;
+ bool autorid_mode;
+ uint32_t hash_val;
+ struct idmap_domain_info *dom;
+
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+
+ idmap_lower = ctx->idmap_opts.idmap_lower;
+ idmap_upper = ctx->idmap_opts.idmap_upper;
+ rangesize = ctx->idmap_opts.rangesize;
+ autorid_mode = ctx->idmap_opts.autorid_mode;
+
+ max_slices = (idmap_upper - idmap_lower) / rangesize;
+
+ if (slice_num && *slice_num != -1) {
+ /* The slice is being set explicitly.
+ * This may happen at system startup when we're loading
+ * previously-determined slices. In the future, we may also
+ * permit configuration to select the slice for a domain
+ * explicitly.
+ */
+ new_slice = *slice_num;
+ } else {
+ /* If slice is -1, we're being asked to pick a new slice */
+
+ if (autorid_mode) {
+ /* In autorid compatibility mode, always start at 0 and find the
+ * first free value.
+ */
+ orig_slice = 0;
+ } else {
+ /* Hash the domain sid string */
+ hash_val = murmurhash3(dom_sid, strlen(dom_sid), 0xdeadbeef);
+
+ /* Now get take the modulus of the hash val and the max_slices
+ * to determine its optimal position in the range.
+ */
+ new_slice = hash_val % max_slices;
+ orig_slice = new_slice;
+ }
+
+ min = (rangesize * new_slice) + idmap_lower;
+ max = min + rangesize;
+ /* Verify that this slice is not already in use */
+ do {
+ for (dom = ctx->idmap_domain_info; dom != NULL; dom = dom->next) {
+ if ((dom->range->min <= min && dom->range->max >= max) ||
+ (dom->range->min >= min && dom->range->min <= max) ||
+ (dom->range->max >= min && dom->range->max <= max)) {
+ /* This range overlaps one already registered
+ * We'll try the next available slot
+ */
+ new_slice++;
+ if (new_slice >= max_slices) {
+ /* loop around to the beginning if necessary */
+ new_slice = 0;
+ }
+
+ min = (rangesize * new_slice) + idmap_lower;
+ max = min + rangesize;
+ break;
+ }
+ }
+
+ /* Keep trying until dom is NULL (meaning we got to the end
+ * without matching) or we have run out of slices and gotten
+ * back to the first one we tried.
+ */
+ } while (dom && new_slice != orig_slice);
+
+ if (dom) {
+ /* We looped all the way through and found no empty slots */
+ return IDMAP_OUT_OF_SLICES;
+ }
+ }
+
+ _range->min = (rangesize * new_slice) + idmap_lower;
+ _range->max = _range->min + rangesize;
+
+ if (slice_num) {
+ *slice_num = new_slice;
+ }
+
+ return IDMAP_SUCCESS;
+}
+
enum idmap_error_code sss_idmap_add_domain(struct sss_idmap_ctx *ctx,
const char *domain_name,
const char *domain_sid,
@@ -511,3 +616,67 @@ done:
return err;
}
+
+enum idmap_error_code
+sss_idmap_ctx_set_autorid(struct sss_idmap_ctx *ctx, bool use_autorid)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ ctx->idmap_opts.autorid_mode = use_autorid;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_set_lower(struct sss_idmap_ctx *ctx, id_t lower)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ ctx->idmap_opts.idmap_lower = lower;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_set_upper(struct sss_idmap_ctx *ctx, id_t upper)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ ctx->idmap_opts.idmap_upper = upper;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_set_rangesize(struct sss_idmap_ctx *ctx, id_t rangesize)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ ctx->idmap_opts.rangesize = rangesize;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_get_autorid(struct sss_idmap_ctx *ctx, bool *_autorid)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ *_autorid = ctx->idmap_opts.autorid_mode;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_get_lower(struct sss_idmap_ctx *ctx, id_t *_lower)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ *_lower = ctx->idmap_opts.idmap_lower;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_get_upper(struct sss_idmap_ctx *ctx, id_t *_upper)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ *_upper = ctx->idmap_opts.idmap_upper;
+ return IDMAP_SUCCESS;
+}
+
+enum idmap_error_code
+sss_idmap_ctx_get_rangesize(struct sss_idmap_ctx *ctx, id_t *_rangesize)
+{
+ CHECK_IDMAP_CTX(ctx, IDMAP_CONTEXT_INVALID);
+ *_rangesize = ctx->idmap_opts.rangesize;
+ return IDMAP_SUCCESS;
+}
diff --git a/src/lib/idmap/sss_idmap.h b/src/lib/idmap/sss_idmap.h
index ced7074a..9204be0b 100644
--- a/src/lib/idmap/sss_idmap.h
+++ b/src/lib/idmap/sss_idmap.h
@@ -71,7 +71,10 @@ enum idmap_error_code {
IDMAP_NO_RANGE,
/** The provided SID is a built-in one */
- IDMAP_BUILTIN_SID
+ IDMAP_BUILTIN_SID,
+
+ /* No more free slices */
+ IDMAP_OUT_OF_SLICES
};
/**
@@ -126,6 +129,100 @@ enum idmap_error_code sss_idmap_init(idmap_alloc_func *alloc_func,
struct sss_idmap_ctx **ctx);
/**
+ * @brief Set/unset autorid compatibility mode
+ *
+ * @param[in] ctx idmap context
+ * @param[in] use_autorid If true, autorid compatibility mode will be used
+ */
+enum idmap_error_code
+sss_idmap_ctx_set_autorid(struct sss_idmap_ctx *ctx, bool use_autorid);
+
+/**
+ * @brief Set the lower bound of the range of POSIX IDs
+ *
+ * @param[in] ctx idmap context
+ * @param[in] lower lower bound of the range
+ */
+enum idmap_error_code
+sss_idmap_ctx_set_lower(struct sss_idmap_ctx *ctx, id_t lower);
+
+/**
+ * @brief Set the upper bound of the range of POSIX IDs
+ *
+ * @param[in] ctx idmap context
+ * @param[in] upper upper bound of the range
+ */
+enum idmap_error_code
+sss_idmap_ctx_set_upper(struct sss_idmap_ctx *ctx, id_t upper);
+
+/**
+ * @brief Set the range size of POSIX IDs available for single domain
+ *
+ * @param[in] ctx idmap context
+ * @param[in] rangesize range size of IDs
+ */
+enum idmap_error_code
+sss_idmap_ctx_set_rangesize(struct sss_idmap_ctx *ctx, id_t rangesize);
+
+/**
+ * @brief Check if autorid compatibility mode is set
+ *
+ * @param[in] ctx idmap context
+ * @param[out] _autorid true if autorid is used
+ */
+enum idmap_error_code
+sss_idmap_ctx_get_autorid(struct sss_idmap_ctx *ctx, bool *_autorid);
+
+/**
+ * @brief Get the lower bound of the range of POSIX IDs
+ *
+ * @param[in] ctx idmap context
+ * @param[out] _lower returned lower bound
+ */
+enum idmap_error_code
+sss_idmap_ctx_get_lower(struct sss_idmap_ctx *ctx, id_t *_lower);
+
+/**
+ * @brief Get the upper bound of the range of POSIX IDs
+ *
+ * @param[in] ctx idmap context
+ * @param[out] _upper returned upper bound
+ */
+enum idmap_error_code
+sss_idmap_ctx_get_upper(struct sss_idmap_ctx *ctx, id_t *_upper);
+
+/**
+ * @brief Get the range size of POSIX IDs available for single domain
+ *
+ * @param[in] ctx idmap context
+ * @param[out] _rangesize returned range size
+ */
+enum idmap_error_code
+sss_idmap_ctx_get_rangesize(struct sss_idmap_ctx *ctx, id_t *rangesize);
+
+/**
+ * @brief Calculate new range of available POSIX IDs
+ *
+ * @param[in] ctx Idmap context
+ * @param[in] dom_sid Zero-terminated string representation of the domain
+ * SID (S-1-15-.....)
+ * @param[in/out] slice_num Slice number to be used. Set this pointer to NULL or
+ * the addressed value to -1 to calculate slice number
+ * automatically. The calculated value will be
+ * returned in this parameter.
+ * @param[out] range Structure containing upper and lower bound of the
+ * range of POSIX IDs
+ *
+ * @return
+ * - #IDMAP_OUT_OF_SLICES: Cannot calculate new range because all slices are
+ * used.
+ */
+enum idmap_error_code sss_idmap_calculate_range(struct sss_idmap_ctx *ctx,
+ const char *dom_sid,
+ id_t *slice_num,
+ struct sss_idmap_range *range);
+
+/**
* @brief Add a domain to the idmap context
*
* @param[in] ctx Idmap context
diff --git a/src/lib/idmap/sss_idmap_private.h b/src/lib/idmap/sss_idmap_private.h
index bdb52895..1d3a3690 100644
--- a/src/lib/idmap/sss_idmap_private.h
+++ b/src/lib/idmap/sss_idmap_private.h
@@ -25,16 +25,36 @@
#ifndef SSS_IDMAP_PRIVATE_H_
#define SSS_IDMAP_PRIVATE_H_
+#define SSS_IDMAP_DEFAULT_LOWER 200000
+#define SSS_IDMAP_DEFAULT_UPPER 2000200000
+#define SSS_IDMAP_DEFAULT_RANGESIZE 200000
+#define SSS_IDMAP_DEFAULT_AUTORID false
+
#define CHECK_IDMAP_CTX(ctx, ret) do { \
if (ctx == NULL || ctx->alloc_func == NULL || ctx->free_func == NULL) { \
return ret; \
} \
} while(0)
+struct sss_idmap_opts {
+ /* true if autorid compatibility mode is used */
+ bool autorid_mode;
+
+ /* smallest available id (for all domains) */
+ id_t idmap_lower;
+
+ /* highest available id (for all domains) */
+ id_t idmap_upper;
+
+ /* number of available UIDs (for single domain) */
+ id_t rangesize;
+};
+
struct sss_idmap_ctx {
idmap_alloc_func *alloc_func;
void *alloc_pvt;
idmap_free_func *free_func;
+ struct sss_idmap_opts idmap_opts;
struct idmap_domain_info *idmap_domain_info;
};
generated by cgit (git 2.34.1) at 2024-11-25 09:15:38 +0000