Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 185 lines (148 sloc) 4.488 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
/*
* QEMU access control list management
*
* Copyright (C) 2009 Red Hat, Inc
*
* 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 "qemu-common.h"
#include "sysemu.h"
#include "acl.h"

#ifdef CONFIG_FNMATCH
#include <fnmatch.h>
#endif


static unsigned int nacls = 0;
static qemu_acl **acls = NULL;



qemu_acl *qemu_acl_find(const char *aclname)
{
    int i;
    for (i = 0 ; i < nacls ; i++) {
        if (strcmp(acls[i]->aclname, aclname) == 0)
            return acls[i];
    }

    return NULL;
}

qemu_acl *qemu_acl_init(const char *aclname)
{
    qemu_acl *acl;

    acl = qemu_acl_find(aclname);
    if (acl)
        return acl;

    acl = qemu_malloc(sizeof(*acl));
    acl->aclname = qemu_strdup(aclname);
    /* Deny by default, so there is no window of "open
* access" between QEMU starting, and the user setting
* up ACLs in the monitor */
    acl->defaultDeny = 1;

    acl->nentries = 0;
    QTAILQ_INIT(&acl->entries);

    acls = qemu_realloc(acls, sizeof(*acls) * (nacls +1));
    acls[nacls] = acl;
    nacls++;

    return acl;
}

int qemu_acl_party_is_allowed(qemu_acl *acl,
                              const char *party)
{
    qemu_acl_entry *entry;

    QTAILQ_FOREACH(entry, &acl->entries, next) {
#ifdef CONFIG_FNMATCH
        if (fnmatch(entry->match, party, 0) == 0)
            return entry->deny ? 0 : 1;
#else
        /* No fnmatch, so fallback to exact string matching
* instead of allowing wildcards */
        if (strcmp(entry->match, party) == 0)
            return entry->deny ? 0 : 1;
#endif
    }

    return acl->defaultDeny ? 0 : 1;
}


void qemu_acl_reset(qemu_acl *acl)
{
    qemu_acl_entry *entry;

    /* Put back to deny by default, so there is no window
* of "open access" while the user re-initializes the
* access control list */
    acl->defaultDeny = 1;
    QTAILQ_FOREACH(entry, &acl->entries, next) {
        QTAILQ_REMOVE(&acl->entries, entry, next);
        free(entry->match);
        free(entry);
    }
    acl->nentries = 0;
}


int qemu_acl_append(qemu_acl *acl,
                    int deny,
                    const char *match)
{
    qemu_acl_entry *entry;

    entry = qemu_malloc(sizeof(*entry));
    entry->match = qemu_strdup(match);
    entry->deny = deny;

    QTAILQ_INSERT_TAIL(&acl->entries, entry, next);
    acl->nentries++;

    return acl->nentries;
}


int qemu_acl_insert(qemu_acl *acl,
                    int deny,
                    const char *match,
                    int index)
{
    qemu_acl_entry *entry;
    qemu_acl_entry *tmp;
    int i = 0;

    if (index <= 0)
        return -1;
    if (index >= acl->nentries)
        return qemu_acl_append(acl, deny, match);


    entry = qemu_malloc(sizeof(*entry));
    entry->match = qemu_strdup(match);
    entry->deny = deny;

    QTAILQ_FOREACH(tmp, &acl->entries, next) {
        i++;
        if (i == index) {
            QTAILQ_INSERT_BEFORE(tmp, entry, next);
            acl->nentries++;
            break;
        }
    }

    return i;
}

int qemu_acl_remove(qemu_acl *acl,
                    const char *match)
{
    qemu_acl_entry *entry;
    int i = 0;

    QTAILQ_FOREACH(entry, &acl->entries, next) {
        i++;
        if (strcmp(entry->match, match) == 0) {
            QTAILQ_REMOVE(&acl->entries, entry, next);
            return i;
        }
    }
    return -1;
}


/*
* Local variables:
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 8
* End:
*/
Something went wrong with that request. Please try again.