ALTER NETWORK POLICY¶

Modifies the properties for an existing network policy. Currently, the only supported actions are changing the IP addresses that are allowed or denied access to the account and adding/overwriting/removing a comment for a network policy.

Note

Only the network policy owner (i.e. role with the OWNERSHIP privilege on the network policy) or higher can alter a network policy.

See also:: CREATE NETWORK POLICY , DESCRIBE NETWORK POLICY , DROP NETWORK POLICY , SHOW NETWORK POLICIES

Syntax¶

ALTER NETWORK POLICY [ IF EXISTS ] <name> SET {
    [ ALLOWED_NETWORK_RULE_LIST = ( '<network_rule>' [ , '<network_rule>' , ... ] ) ]
    [ BLOCKED_NETWORK_RULE_LIST = ( '<network_rule>' [ , '<network_rule>' , ... ] ) ]
    [ ALLOWED_IP_LIST = ( [ '<ip_address>' ] [ , '<ip_address>' ... ] ) ]
    [ BLOCKED_IP_LIST = ( [ '<ip_address>' ] [ , '<ip_address>' ... ] ) ]
    [ COMMENT = '<string_literal>' ] }

ALTER NETWORK POLICY [ IF EXISTS ] <name> UNSET COMMENT

ALTER NETWORK POLICY <name> ADD { ALLOWED_NETWORK_RULE_LIST = '<network_rule>' | BLOCKED_NETWORK_RULE_LIST = '<network_rule>' }

ALTER NETWORK POLICY <name> REMOVE { ALLOWED_NETWORK_RULE_LIST = '<network_rule>' | BLOCKED_NETWORK_RULE_LIST = '<network_rule>' }

ALTER NETWORK POLICY <name>  RENAME TO <new_name>

ALTER NETWORK POLICY <name> SET TAG <tag_name> = '<tag_value>' [ , <tag_name> = '<tag_value>' ... ]

ALTER NETWORK POLICY <name> UNSET TAG <tag_name> [ , <tag_name> ... ]

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Parameters¶

name: Specifies the identifier for the network policy to alter. If the identifier contains spaces or special characters, the entire string must be enclosed in double quotes. Identifiers enclosed in double quotes are also case-sensitive.

SET ...

Specifies the parameter to set for the network policy:

ALLOWED_NETWORK_RULE_LIST = ( 'network_rule' [ , 'network_rule' , ... ] )
Specifies a list of network rules that contain the network identifiers that are allowed access to Snowflake. There is no limit on the number of network rules in the list.

Replaces existing network rules in the allowed list. To add network rules without replacing existing ones, use the ALTER NETWORK POLICY ... ADD command.

BLOCKED_NETWORK_RULE_LIST = ( 'network_rule' [ , 'network_rule' , ... ] )
Specifies a list of network rules that contain the network identifiers that are denied access to Snowflake. There is no limit on the number of network rules in the list.

Replaces existing network rules in the blocked list. To add network rules without replacing existing ones, use the ALTER NETWORK POLICY ... ADD command.

ALLOWED_IP_LIST = ( [ ip_address ] [ , ip_address , ... ] )
Specifies a list of IPv4 addresses that are allowed access to your Snowflake account. This is referred to as the allowed list.

Snowflake recommends using network rules in conjunction with network policies rather than using this property. Use the ALLOWED_NETWORK_RULE_LIST property to specify network rules that contain IPv4 addresses.

If you are not yet using network rules, specify at least one IPv4 address or CIDR block range to allow access to your Snowflake account. Additionally, if you are not using network rules and this property is specified with an empty list, no IPv4 addresses are allowed to access your Snowflake account.

BLOCKED_IP_LIST = ( [ ip_address ] [ , ip_address , ... ] )
Specifies a list of IPv4 addresses that are denied access to your Snowflake account. This is referred to as the blocked list. To unset this parameter, specify a different CIDR block range, a series of IPv4 addresses, or a single IPv4 address.

Snowflake recommends using network rules in conjunction with network policies rather than using this parameter. Use the BLOCKED_NETWORK_RULE_LIST property to specify network rules that contain IPv4 addresses.

To block public access, use a network rule and add the network rule to the BLOCKED_NETWORK_RULE_LIST property. The result is that only IP addresses that use private connectivity, such as AWS PrivateLink, can access your Snowflake account.

Default: No value; no IP addresses in ALLOWED_IP_LIST property are blocked.

COMMENT = 'string_literal'
Adds a comment or overwrites an existing comment for the network policy.

TAG tag_name = 'tag_value' [ , tag_name = 'tag_value' , ... ]
Specifies the tag name and the tag string value.

The tag value is always a string, and the maximum number of characters for the tag value is 256.

For information about specifying tags in a statement, see Tag quotas for objects and columns.

UNSET ...

Specifies the properties to unset for the network policy, which resets them to the defaults:

COMMENT, which removes the comment, if one exists, for the network policy.

TAG tag_name [ , tag_name ... ]

ADD { ALLOWED_NETWORK_RULE_LIST = 'network_rule' | BLOCKED_NETWORK_RULE_LIST = 'network_rule' }: Adds a network rule to the allowed or blocked list of the network policy without removing existing ones.
REMOVE { ALLOWED_NETWORK_RULE_LIST = 'network_rule' | BLOCKED_NETWORK_RULE_LIST = 'network_rule' }: Removes a network rule from the allowed or blocked list of the network policy.
RENAME TO ...: Specifies a new name for the existing network policy.

Usage notes¶

Do not modify a network policy to have empty ALLOWED_IP_LIST and BLOCKED_IP_LIST properties. Use network rules in conjunction with the network policy to manage access to your Snowflake account.
The SET action for the allowed/blocked lists is not additive (that is, it removes all IP addresses in the existing lists for the network policy and replaces them with the specified lists).

As a result, to make additions to the existing lists, you must specify the new IP addresses and replicate the existing lists.
Each ip_address can cover a range of addresses using Classless Inter-Domain Routing (CIDR) notation:

ip_address[/optional_prefix_length]

For example:

192.168.1.0/24
When a network policy includes values for both ALLOWED_IP_LIST and BLOCKED_IP_LIST, Snowflake applies the blocked list first.
Do not add 0.0.0.0/0 to BLOCKED_IP_LIST. Because Snowflake applies the blocked list first, this would block your own access. Additionally, in order to block all IP addresses except a select list, you only need to add IP addresses to ALLOWED_IP_LIST. Snowflake automatically blocks all IP addresses not included in the allowed list.
Regarding metadata:

Attention

Customers should ensure that no personal data (other than for a User object), sensitive data, export-controlled data, or other regulated data is entered as metadata when using the Snowflake service. For more information, see Metadata fields in Snowflake.

Example¶

Alter a network policy named mypolicy1 as follows:

Retain the existing allowed list (all IP addresses in the range of 192.168.1.0/24) and blocked list (192.168.1.99) for the policy, as defined in the CREATE NETWORK POLICY examples.

Add IP address 192.168.255.100 to the allowed list.

Deny all other IP addresses.
DESC NETWORK POLICY mypolicy1;
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+-----------------+----------------+
| name            | value          |
|-----------------+----------------|
| ALLOWED_IP_LIST | 192.168.1.0/24 |
| BLOCKED_IP_LIST | 192.168.1.99   |
+-----------------+----------------+

ALTER NETWORK POLICY mypolicy1 SET ALLOWED_IP_LIST=('192.168.1.0/24','192.168.255.100')
                                   BLOCKED_IP_LIST=('192.168.1.99');

DESC NETWORK POLICY mypolicy1;

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+-----------------+--------------------------------+
| name            | value                          |
|-----------------+--------------------------------|
| ALLOWED_IP_LIST | 192.168.1.0/24,192.168.255.100 |
| BLOCKED_IP_LIST | 192.168.1.99                   |
+-----------------+--------------------------------+

Note

To retain the existing allowed and blocked lists, you must include all the IP addresses from the previous lists.