Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 867 insertions, 0 deletions

diff --git a/security/nss/lib/util/pkcs11uri.c b/security/nss/lib/util/pkcs11uri.c
new file mode 100644
index 0000000000..e0c4077a3d
--- /dev/null
+++ b/security/nss/lib/util/pkcs11uri.c
@@ -0,0 +1,867 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "pkcs11.h"
+#include "pkcs11uri.h"
+#include "plarena.h"
+#include "prprf.h"
+#include "secport.h"
+
+/* Character sets used in the ABNF rules in RFC7512. */
+#define PK11URI_DIGIT "0123456789"
+#define PK11URI_ALPHA "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define PK11URI_HEXDIG PK11URI_DIGIT "abcdefABCDEF"
+#define PK11URI_UNRESERVED PK11URI_ALPHA PK11URI_DIGIT "-._~"
+#define PK11URI_RES_AVAIL ":[]@!$'()*+,="
+#define PK11URI_PATH_RES_AVAIL PK11URI_RES_AVAIL "&"
+#define PK11URI_QUERY_RES_AVAIL PK11URI_RES_AVAIL "/?|"
+#define PK11URI_ATTR_NM_CHAR PK11URI_ALPHA PK11URI_DIGIT "-_"
+#define PK11URI_PCHAR PK11URI_UNRESERVED PK11URI_PATH_RES_AVAIL
+#define PK11URI_QCHAR PK11URI_UNRESERVED PK11URI_QUERY_RES_AVAIL
+
+/* Path attributes defined in RFC7512. */
+static const char *pattr_names[] = {
+    PK11URI_PATTR_TOKEN,
+    PK11URI_PATTR_MANUFACTURER,
+    PK11URI_PATTR_SERIAL,
+    PK11URI_PATTR_MODEL,
+    PK11URI_PATTR_LIBRARY_MANUFACTURER,
+    PK11URI_PATTR_LIBRARY_DESCRIPTION,
+    PK11URI_PATTR_LIBRARY_VERSION,
+    PK11URI_PATTR_OBJECT,
+    PK11URI_PATTR_TYPE,
+    PK11URI_PATTR_ID,
+    PK11URI_PATTR_SLOT_MANUFACTURER,
+    PK11URI_PATTR_SLOT_DESCRIPTION,
+    PK11URI_PATTR_SLOT_ID
+};
+
+/* Query attributes defined in RFC7512. */
+static const char *qattr_names[] = {
+    PK11URI_QATTR_PIN_SOURCE,
+    PK11URI_QATTR_PIN_VALUE,
+    PK11URI_QATTR_MODULE_NAME,
+    PK11URI_QATTR_MODULE_PATH
+};
+
+struct PK11URIBufferStr {
+    PLArenaPool *arena;
+    unsigned char *data;
+    size_t size;
+    size_t allocated;
+};
+typedef struct PK11URIBufferStr PK11URIBuffer;
+
+struct PK11URIAttributeListEntryStr {
+    char *name;
+    SECItem value;
+};
+typedef struct PK11URIAttributeListEntryStr PK11URIAttributeListEntry;
+
+struct PK11URIAttributeListStr {
+    PLArenaPool *arena;
+    PK11URIAttributeListEntry *attrs;
+    size_t num_attrs;
+};
+typedef struct PK11URIAttributeListStr PK11URIAttributeList;
+
+struct PK11URIStr {
+    PLArenaPool *arena;
+
+    PK11URIAttributeList pattrs;
+    PK11URIAttributeList vpattrs;
+
+    PK11URIAttributeList qattrs;
+    PK11URIAttributeList vqattrs;
+};
+
+#define PK11URI_ARENA_SIZE 1024
+
+typedef int (*PK11URIAttributeCompareNameFunc)(const char *a, const char *b);
+
+/* This belongs in secport.h */
+#define PORT_ArenaGrowArray(poolp, oldptr, type, oldnum, newnum) \
+    (type *)PORT_ArenaGrow((poolp), (oldptr),                    \
+                           (oldnum) * sizeof(type), (newnum) * sizeof(type))
+#define PORT_ReallocArray(oldptr, type, newnum) \
+    (type *)PORT_Realloc((oldptr), (newnum) * sizeof(type))
+
+/* Functions for resizable buffer. */
+static SECStatus
+pk11uri_AppendBuffer(PK11URIBuffer *buffer, const unsigned char *data,
+                     size_t size)
+{
+    /* Check overflow. */
+    if (buffer->size + size < buffer->size)
+        return SECFailure;
+
+    if (buffer->size + size > buffer->allocated) {
+        size_t allocated = buffer->allocated * 2 + size;
+        if (allocated < buffer->allocated)
+            return SECFailure;
+        if (buffer->arena)
+            buffer->data = PORT_ArenaGrow(buffer->arena, buffer->data,
+                                          buffer->allocated, allocated);
+        else
+            buffer->data = PORT_Realloc(buffer->data, allocated);
+        if (buffer->data == NULL)
+            return SECFailure;
+        buffer->allocated = allocated;
+    }
+
+    memcpy(&buffer->data[buffer->size], data, size);
+    buffer->size += size;
+
+    return SECSuccess;
+}
+
+static void
+pk11uri_InitBuffer(PK11URIBuffer *buffer, PLArenaPool *arena)
+{
+    memset(buffer, 0, sizeof(PK11URIBuffer));
+    buffer->arena = arena;
+}
+
+static void
+pk11uri_DestroyBuffer(PK11URIBuffer *buffer)
+{
+    if (buffer->arena == NULL) {
+        PORT_Free(buffer->data);
+    }
+}
+
+/* URI encoding functions. */
+static char *
+pk11uri_Escape(PLArenaPool *arena, const unsigned char *value, size_t length,
+               const char *available)
+{
+    PK11URIBuffer buffer;
+    const unsigned char *p;
+    unsigned char buf[4];
+    char *result = NULL;
+    SECStatus ret;
+
+    pk11uri_InitBuffer(&buffer, arena);
+
+    for (p = value; p < value + length; p++) {
+        if (strchr(available, *p) == NULL) {
+            if (PR_snprintf((char *)buf, sizeof(buf), "%%%02X", *p) == (PRUint32)-1) {
+                goto fail;
+            }
+            ret = pk11uri_AppendBuffer(&buffer, buf, 3);
+            if (ret != SECSuccess) {
+                goto fail;
+            }
+        } else {
+            ret = pk11uri_AppendBuffer(&buffer, p, 1);
+            if (ret != SECSuccess) {
+                goto fail;
+            }
+        }
+    }
+    buf[0] = '\0';
+    ret = pk11uri_AppendBuffer(&buffer, buf, 1);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    /* Steal the memory allocated in buffer. */
+    result = (char *)buffer.data;
+    buffer.data = NULL;
+
+fail:
+    pk11uri_DestroyBuffer(&buffer);
+
+    return result;
+}
+
+static unsigned char *
+pk11uri_Unescape(PLArenaPool *arena, const char *value, size_t *length)
+{
+    PK11URIBuffer buffer;
+    const char *p;
+    unsigned char buf[1];
+    unsigned char *result = NULL;
+    SECStatus ret;
+
+    pk11uri_InitBuffer(&buffer, arena);
+
+    for (p = value; p < value + *length; p++) {
+        if (*p == '%') {
+            int c;
+            size_t i;
+
+            p++;
+            for (c = 0, i = 0; i < 2; i++) {
+                int h = *(p + i);
+                if ('0' <= h && h <= '9') {
+                    c = (c << 4) | (h - '0');
+                } else if ('a' <= h && h <= 'f') {
+                    c = (c << 4) | (h - 'a' + 10);
+                } else if ('A' <= h && h <= 'F') {
+                    c = (c << 4) | (h - 'A' + 10);
+                } else {
+                    break;
+                }
+            }
+            if (i != 2) {
+                goto fail;
+            }
+            p++;
+            buf[0] = c;
+        } else {
+            buf[0] = *p;
+        }
+        ret = pk11uri_AppendBuffer(&buffer, buf, 1);
+        if (ret != SECSuccess) {
+            goto fail;
+        }
+    }
+    *length = buffer.size;
+    buf[0] = '\0';
+    ret = pk11uri_AppendBuffer(&buffer, buf, 1);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    result = buffer.data;
+    buffer.data = NULL;
+
+fail:
+    pk11uri_DestroyBuffer(&buffer);
+
+    return result;
+}
+
+/* Functions for manipulating attributes array. */
+
+/* Compare two attribute names by the array index in attr_names.  Both
+ * attribute names must be present in attr_names, otherwise it is a
+ * programming error. */
+static int
+pk11uri_CompareByPosition(const char *a, const char *b,
+                          const char **attr_names, size_t num_attr_names)
+{
+    size_t i, j;
+
+    for (i = 0; i < num_attr_names; i++) {
+        if (strcmp(a, attr_names[i]) == 0) {
+            break;
+        }
+    }
+    PR_ASSERT(i < num_attr_names);
+
+    for (j = 0; j < num_attr_names; j++) {
+        if (strcmp(b, attr_names[j]) == 0) {
+            break;
+        }
+    }
+    PR_ASSERT(j < num_attr_names);
+
+    return i - j;
+}
+
+/* Those pk11uri_Compare{Path,Query}AttributeName functions are used
+ * to reorder attributes when inserting. */
+static int
+pk11uri_ComparePathAttributeName(const char *a, const char *b)
+{
+    return pk11uri_CompareByPosition(a, b, pattr_names, PR_ARRAY_SIZE(pattr_names));
+}
+
+static int
+pk11uri_CompareQueryAttributeName(const char *a, const char *b)
+{
+    return pk11uri_CompareByPosition(a, b, qattr_names, PR_ARRAY_SIZE(qattr_names));
+}
+
+static SECStatus
+pk11uri_InsertToAttributeList(PK11URIAttributeList *attrs,
+                              char *name, unsigned char *value, size_t size,
+                              PK11URIAttributeCompareNameFunc compare_name,
+                              PRBool allow_duplicate)
+{
+    size_t i;
+
+    if (attrs->arena) {
+        attrs->attrs = PORT_ArenaGrowArray(attrs->arena, attrs->attrs,
+                                           PK11URIAttributeListEntry,
+                                           attrs->num_attrs,
+                                           attrs->num_attrs + 1);
+    } else {
+        attrs->attrs = PORT_ReallocArray(attrs->attrs,
+                                         PK11URIAttributeListEntry,
+                                         attrs->num_attrs + 1);
+    }
+    if (attrs->attrs == NULL) {
+        return SECFailure;
+    }
+
+    for (i = 0; i < attrs->num_attrs; i++) {
+        if (!allow_duplicate && strcmp(name, attrs->attrs[i].name) == 0) {
+            return SECFailure;
+        }
+        if (compare_name(name, attrs->attrs[i].name) < 0) {
+            memmove(&attrs->attrs[i + 1], &attrs->attrs[i],
+                    sizeof(PK11URIAttributeListEntry) * (attrs->num_attrs - i));
+            break;
+        }
+    }
+
+    attrs->attrs[i].name = name;
+    attrs->attrs[i].value.type = siBuffer;
+    attrs->attrs[i].value.data = value;
+    attrs->attrs[i].value.len = size;
+
+    attrs->num_attrs++;
+
+    return SECSuccess;
+}
+
+static SECStatus
+pk11uri_InsertToAttributeListEscaped(PK11URIAttributeList *attrs,
+                                     const char *name, size_t name_size,
+                                     const char *value, size_t value_size,
+                                     PK11URIAttributeCompareNameFunc compare_name,
+                                     PRBool allow_duplicate)
+{
+    char *name_copy = NULL;
+    unsigned char *value_copy = NULL;
+    SECStatus ret;
+
+    if (attrs->arena) {
+        name_copy = PORT_ArenaNewArray(attrs->arena, char, name_size + 1);
+    } else {
+        name_copy = PORT_Alloc(name_size + 1);
+    }
+    if (name_copy == NULL) {
+        goto fail;
+    }
+    memcpy(name_copy, name, name_size);
+    name_copy[name_size] = '\0';
+
+    value_copy = pk11uri_Unescape(attrs->arena, value, &value_size);
+    if (value_copy == NULL) {
+        goto fail;
+    }
+
+    ret = pk11uri_InsertToAttributeList(attrs, name_copy, value_copy, value_size,
+                                        compare_name, allow_duplicate);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    return ret;
+
+fail:
+    if (attrs->arena == NULL) {
+        PORT_Free(name_copy);
+        PORT_Free(value_copy);
+    }
+
+    return SECFailure;
+}
+
+static void
+pk11uri_InitAttributeList(PK11URIAttributeList *attrs, PLArenaPool *arena)
+{
+    memset(attrs, 0, sizeof(PK11URIAttributeList));
+    attrs->arena = arena;
+}
+
+static void
+pk11uri_DestroyAttributeList(PK11URIAttributeList *attrs)
+{
+    if (attrs->arena == NULL) {
+        size_t i;
+
+        for (i = 0; i < attrs->num_attrs; i++) {
+            PORT_Free(attrs->attrs[i].name);
+            PORT_Free(attrs->attrs[i].value.data);
+        }
+        PORT_Free(attrs->attrs);
+    }
+}
+
+static SECStatus
+pk11uri_AppendAttributeListToBuffer(PK11URIBuffer *buffer,
+                                    PK11URIAttributeList *attrs,
+                                    int separator,
+                                    const char *unescaped)
+{
+    size_t i;
+    SECStatus ret;
+
+    for (i = 0; i < attrs->num_attrs; i++) {
+        unsigned char sep[1];
+        char *escaped;
+        PK11URIAttributeListEntry *attr = &attrs->attrs[i];
+
+        if (i > 0) {
+            sep[0] = separator;
+            ret = pk11uri_AppendBuffer(buffer, sep, 1);
+            if (ret != SECSuccess) {
+                return ret;
+            }
+        }
+
+        ret = pk11uri_AppendBuffer(buffer, (unsigned char *)attr->name,
+                                   strlen(attr->name));
+        if (ret != SECSuccess) {
+            return ret;
+        }
+
+        sep[0] = '=';
+        ret = pk11uri_AppendBuffer(buffer, sep, 1);
+        if (ret != SECSuccess) {
+            return ret;
+        }
+
+        escaped = pk11uri_Escape(buffer->arena, attr->value.data, attr->value.len,
+                                 unescaped);
+        if (escaped == NULL) {
+            return ret;
+        }
+        ret = pk11uri_AppendBuffer(buffer, (unsigned char *)escaped,
+                                   strlen(escaped));
+        if (buffer->arena == NULL) {
+            PORT_Free(escaped);
+        }
+        if (ret != SECSuccess) {
+            return ret;
+        }
+    }
+
+    return SECSuccess;
+}
+
+/* Creation of PK11URI object. */
+static PK11URI *
+pk11uri_AllocURI(void)
+{
+    PLArenaPool *arena;
+    PK11URI *result;
+
+    arena = PORT_NewArena(PK11URI_ARENA_SIZE);
+    if (arena == NULL) {
+        return NULL;
+    }
+
+    result = PORT_ArenaZAlloc(arena, sizeof(PK11URI));
+    if (result == NULL) {
+        PORT_FreeArena(arena, PR_FALSE);
+        return NULL;
+    }
+
+    result->arena = arena;
+    pk11uri_InitAttributeList(&result->pattrs, arena);
+    pk11uri_InitAttributeList(&result->vpattrs, arena);
+    pk11uri_InitAttributeList(&result->qattrs, arena);
+    pk11uri_InitAttributeList(&result->vqattrs, arena);
+
+    return result;
+}
+
+static SECStatus
+pk11uri_InsertAttributes(PK11URIAttributeList *dest_attrs,
+                         PK11URIAttributeList *dest_vattrs,
+                         const PK11URIAttribute *attrs,
+                         size_t num_attrs,
+                         const char **attr_names,
+                         size_t num_attr_names,
+                         PK11URIAttributeCompareNameFunc compare_name,
+                         PRBool allow_duplicate,
+                         PRBool vendor_allow_duplicate)
+{
+    SECStatus ret;
+    size_t i;
+
+    for (i = 0; i < num_attrs; i++) {
+        char *name, *value;
+        const char *p;
+        size_t j;
+
+        p = attrs[i].name;
+
+        /* The attribute must not be empty. */
+        if (*p == '\0') {
+            return SECFailure;
+        }
+
+        /* Check that the name doesn't contain invalid character. */
+        for (; *p != '\0'; p++) {
+            if (strchr(PK11URI_ATTR_NM_CHAR, *p) == NULL) {
+                return SECFailure;
+            }
+        }
+
+        name = PORT_ArenaStrdup(dest_attrs->arena, attrs[i].name);
+        if (name == NULL) {
+            return SECFailure;
+        }
+
+        value = PORT_ArenaStrdup(dest_attrs->arena, attrs[i].value);
+        if (value == NULL) {
+            return SECFailure;
+        }
+
+        for (j = 0; j < num_attr_names; j++) {
+            if (strcmp(name, attr_names[j]) == 0) {
+                break;
+            }
+        }
+        if (j < num_attr_names) {
+            /* Named attribute. */
+            ret = pk11uri_InsertToAttributeList(dest_attrs,
+                                                name,
+                                                (unsigned char *)value,
+                                                strlen(value),
+                                                compare_name,
+                                                allow_duplicate);
+            if (ret != SECSuccess) {
+                return ret;
+            }
+        } else {
+            /* Vendor attribute. */
+            ret = pk11uri_InsertToAttributeList(dest_vattrs,
+                                                name,
+                                                (unsigned char *)value,
+                                                strlen(value),
+                                                strcmp,
+                                                vendor_allow_duplicate);
+            if (ret != SECSuccess) {
+                return ret;
+            }
+        }
+    }
+
+    return SECSuccess;
+}
+
+PK11URI *
+PK11URI_CreateURI(const PK11URIAttribute *pattrs,
+                  size_t num_pattrs,
+                  const PK11URIAttribute *qattrs,
+                  size_t num_qattrs)
+{
+    PK11URI *result;
+    SECStatus ret;
+
+    result = pk11uri_AllocURI();
+
+    ret = pk11uri_InsertAttributes(&result->pattrs, &result->vpattrs,
+                                   pattrs, num_pattrs,
+                                   pattr_names, PR_ARRAY_SIZE(pattr_names),
+                                   pk11uri_ComparePathAttributeName,
+                                   PR_FALSE, PR_FALSE);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    ret = pk11uri_InsertAttributes(&result->qattrs, &result->vqattrs,
+                                   qattrs, num_qattrs,
+                                   qattr_names, PR_ARRAY_SIZE(qattr_names),
+                                   pk11uri_CompareQueryAttributeName,
+                                   PR_FALSE, PR_TRUE);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    return result;
+
+fail:
+    PK11URI_DestroyURI(result);
+
+    return NULL;
+}
+
+/* Parsing. */
+static SECStatus
+pk11uri_ParseAttributes(const char **string,
+                        const char *stop_chars,
+                        int separator,
+                        const char *accept_chars,
+                        const char **attr_names, size_t num_attr_names,
+                        PK11URIAttributeList *attrs,
+                        PK11URIAttributeList *vattrs,
+                        PK11URIAttributeCompareNameFunc compare_name,
+                        PRBool allow_duplicate,
+                        PRBool vendor_allow_duplicate)
+{
+    const char *p = *string;
+
+    for (; *p != '\0'; p++) {
+        const char *name_start, *name_end, *value_start, *value_end;
+        size_t name_length, value_length, i;
+        SECStatus ret;
+
+        if (strchr(stop_chars, *p) != NULL) {
+            break;
+        }
+        for (name_start = p; *p != '=' && *p != '\0'; p++) {
+            if (strchr(PK11URI_ATTR_NM_CHAR, *p) != NULL)
+                continue;
+
+            return SECFailure;
+        }
+        if (*p == '\0') {
+            return SECFailure;
+        }
+        name_end = p++;
+
+        /* The attribute name must not be empty. */
+        if (name_end == name_start) {
+            return SECFailure;
+        }
+
+        for (value_start = p; *p != separator && *p != '\0'; p++) {
+            if (strchr(stop_chars, *p) != NULL) {
+                break;
+            }
+            if (strchr(accept_chars, *p) != NULL) {
+                continue;
+            }
+            if (*p == '%') {
+                const char ch2 = *++p;
+                if (strchr(PK11URI_HEXDIG, ch2) != NULL) {
+                    const char ch3 = *++p;
+                    if (strchr(PK11URI_HEXDIG, ch3) != NULL)
+                        continue;
+                }
+            }
+
+            return SECFailure;
+        }
+        value_end = p;
+
+        name_length = name_end - name_start;
+        value_length = value_end - value_start;
+
+        for (i = 0; i < num_attr_names; i++) {
+            if (name_length == strlen(attr_names[i]) &&
+                memcmp(name_start, attr_names[i], name_length) == 0) {
+                break;
+            }
+        }
+        if (i < num_attr_names) {
+            /* Named attribute. */
+            ret = pk11uri_InsertToAttributeListEscaped(attrs,
+                                                       name_start, name_length,
+                                                       value_start, value_length,
+                                                       compare_name,
+                                                       allow_duplicate);
+            if (ret != SECSuccess) {
+                return ret;
+            }
+        } else {
+            /* Vendor attribute. */
+            ret = pk11uri_InsertToAttributeListEscaped(vattrs,
+                                                       name_start, name_length,
+                                                       value_start, value_length,
+                                                       strcmp,
+                                                       vendor_allow_duplicate);
+            if (ret != SECSuccess) {
+                return ret;
+            }
+        }
+
+        if (*p == '?' || *p == '\0') {
+            break;
+        }
+    }
+
+    *string = p;
+    return SECSuccess;
+}
+
+PK11URI *
+PK11URI_ParseURI(const char *string)
+{
+    PK11URI *result;
+    const char *p = string;
+    SECStatus ret;
+
+    if (PORT_Strncasecmp("pkcs11:", p, 7) != 0) {
+        return NULL;
+    }
+    p += 7;
+
+    result = pk11uri_AllocURI();
+    if (result == NULL) {
+        return NULL;
+    }
+
+    /* Parse the path component and its attributes. */
+    ret = pk11uri_ParseAttributes(&p, "?", ';', PK11URI_PCHAR,
+                                  pattr_names, PR_ARRAY_SIZE(pattr_names),
+                                  &result->pattrs, &result->vpattrs,
+                                  pk11uri_ComparePathAttributeName,
+                                  PR_FALSE, PR_FALSE);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    /* Parse the query component and its attributes. */
+    if (*p == '?') {
+        p++;
+        ret = pk11uri_ParseAttributes(&p, "", '&', PK11URI_QCHAR,
+                                      qattr_names, PR_ARRAY_SIZE(qattr_names),
+                                      &result->qattrs, &result->vqattrs,
+                                      pk11uri_CompareQueryAttributeName,
+                                      PR_FALSE, PR_TRUE);
+        if (ret != SECSuccess) {
+            goto fail;
+        }
+    }
+
+    return result;
+
+fail:
+    PK11URI_DestroyURI(result);
+
+    return NULL;
+}
+
+/* Formatting. */
+char *
+PK11URI_FormatURI(PLArenaPool *arena, PK11URI *uri)
+{
+    PK11URIBuffer buffer;
+    SECStatus ret;
+    char *result = NULL;
+
+    pk11uri_InitBuffer(&buffer, arena);
+
+    ret = pk11uri_AppendBuffer(&buffer, (unsigned char *)"pkcs11:", 7);
+    if (ret != SECSuccess)
+        goto fail;
+
+    ret = pk11uri_AppendAttributeListToBuffer(&buffer, &uri->pattrs, ';', PK11URI_PCHAR);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    if (uri->pattrs.num_attrs > 0 && uri->vpattrs.num_attrs > 0) {
+        ret = pk11uri_AppendBuffer(&buffer, (unsigned char *)";", 1);
+        if (ret != SECSuccess) {
+            goto fail;
+        }
+    }
+
+    ret = pk11uri_AppendAttributeListToBuffer(&buffer, &uri->vpattrs, ';',
+                                              PK11URI_PCHAR);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    if (uri->qattrs.num_attrs > 0 || uri->vqattrs.num_attrs > 0) {
+        ret = pk11uri_AppendBuffer(&buffer, (unsigned char *)"?", 1);
+        if (ret != SECSuccess) {
+            goto fail;
+        }
+    }
+
+    ret = pk11uri_AppendAttributeListToBuffer(&buffer, &uri->qattrs, '&', PK11URI_QCHAR);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    if (uri->qattrs.num_attrs > 0 && uri->vqattrs.num_attrs > 0) {
+        ret = pk11uri_AppendBuffer(&buffer, (unsigned char *)"&", 1);
+        if (ret != SECSuccess) {
+            goto fail;
+        }
+    }
+
+    ret = pk11uri_AppendAttributeListToBuffer(&buffer, &uri->vqattrs, '&',
+                                              PK11URI_QCHAR);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    ret = pk11uri_AppendBuffer(&buffer, (unsigned char *)"\0", 1);
+    if (ret != SECSuccess) {
+        goto fail;
+    }
+
+    result = (char *)buffer.data;
+    buffer.data = NULL;
+
+fail:
+    pk11uri_DestroyBuffer(&buffer);
+
+    return result;
+}
+
+/* Deallocating. */
+void
+PK11URI_DestroyURI(PK11URI *uri)
+{
+    pk11uri_DestroyAttributeList(&uri->pattrs);
+    pk11uri_DestroyAttributeList(&uri->vpattrs);
+    pk11uri_DestroyAttributeList(&uri->qattrs);
+    pk11uri_DestroyAttributeList(&uri->vqattrs);
+    PORT_FreeArena(uri->arena, PR_FALSE);
+}
+
+/* Accessors. */
+static const SECItem *
+pk11uri_GetAttribute(PK11URIAttributeList *attrs,
+                     PK11URIAttributeList *vattrs,
+                     const char *name)
+{
+    size_t i;
+
+    for (i = 0; i < attrs->num_attrs; i++) {
+        if (strcmp(name, attrs->attrs[i].name) == 0) {
+            return &attrs->attrs[i].value;
+        }
+    }
+
+    for (i = 0; i < vattrs->num_attrs; i++) {
+        if (strcmp(name, vattrs->attrs[i].name) == 0) {
+            return &vattrs->attrs[i].value;
+        }
+    }
+
+    return NULL;
+}
+
+const SECItem *
+PK11URI_GetPathAttributeItem(PK11URI *uri, const char *name)
+{
+    return pk11uri_GetAttribute(&uri->pattrs, &uri->vpattrs, name);
+}
+
+const char *
+PK11URI_GetPathAttribute(PK11URI *uri, const char *name)
+{
+    const SECItem *value;
+
+    value = PK11URI_GetPathAttributeItem(uri, name);
+    if (!value) {
+        return NULL;
+    }
+
+    return (const char *)value->data;
+}
+
+const SECItem *
+PK11URI_GetQueryAttributeItem(PK11URI *uri, const char *name)
+{
+    return pk11uri_GetAttribute(&uri->qattrs, &uri->vqattrs, name);
+}
+
+const char *
+PK11URI_GetQueryAttribute(PK11URI *uri, const char *name)
+{
+    const SECItem *value;
+
+    value = PK11URI_GetQueryAttributeItem(uri, name);
+    if (!value) {
+        return NULL;
+    }
+
+    return (const char *)value->data;
+}