Imported from jeremylongshore/tons-of-skills-marketplace (plugins/saas-packs/snowflake-pack/skills/snowflake-strong-auth-migration-pilot/SKILL.md). Install upstream with npx skills add jeremylongshore/tons-of-skills-marketplace --skill snowflake-strong-auth-migration-pilot. Copyright stays with the author (MIT).

Snowflake Strong-Auth Migration Pilot

Overview

Convert an uncertain Snowflake identity estate into an owner-backed, least-privilege authentication pilot. The useful unit is a named workload and its runtime—not a blanket account-wide password deadline. The pilot classifies PERSON, SERVICE, LEGACY_SERVICE, and SERVICE_AGENT principals, maps each bound workload to a supported target, and checks that managed MCP/OAuth primary-role scopes, client behavior, and secondary-role controls cannot silently broaden access.

Prerequisites

• Three live schema-2 collector receipts: near-current SHOW USERS, delayed Account Usage USERS, and the latency-settled portion of a bounded trailing seven-day LOGIN_HISTORY horizon. Record the final bundle SHA-256 outside the bundle when it crosses the controlled local collection boundary; an embedded self-checksum is not provenance.
• Named identity/workload owner, security approver, executor, recovery identity, and approved canary/change window. The inventory must include a separately tested break-glass identity and a canary receipt with positive and negative outcomes. Keep those operational receipts outside this posture bundle; the analyzer intentionally rejects and never echoes embedded canary or recovery payloads.
• Python 3.10+ for the bundled stdlib analyzer. No Snowflake driver or network access is required.

Authentication

This skill's analyzer is offline and intentionally has no credential or token authentication flow. If live Snowflake evidence is collected, use the organization's approved session/authentication process and record method names only; never place credentials in the inventory or report. This skill has no Edit authority and never edits local source or Snowflake objects. The Python analyzer may write only the explicitly requested sanitized report path via --out; never use that capability for credentials or mutation commands.

This package does not provide an MCP server, OAuth client, or token broker. Any connector is configured separately. Supply only sanitized read-only evidence and verify account, edition, connector, client behavior, and feature availability.

Non-negotiable boundaries

• Read-only planning. This skill never disables users, rotates keys, creates or alters integrations, changes authentication/network policies, or handles passwords, PATs, tokens, private keys, or client secrets.
• Do not invent a universal retirement date. Dates depend on the account, connector, runtime, feature availability, owner, and approved change window.
• A service without a named workload is an ownership gap, not permission to disable it. A LEGACY_SERVICE must be bound and tested before retirement.
• Snowflake-managed SNOWFLAKE_SERVICE rows remain in receipt cap accounting but are excluded from the operator migration denominator. SERVICE_AGENT remains an operator-owned service classification.
• Prefer WIF only when the exact cloud runtime, Snowflake integration, and connector support it. Otherwise evaluate key pair, OAuth, or a bounded PAT using workload-auth-options.md.
• Managed MCP/OAuth uses separate controls: advertised primary-role scopes, client scope behavior, the user's DEFAULT_ROLE, allowed/blocked roles, and OAUTH_USE_SECONDARY_ROLES. Never collapse those into one invented role list.

Workflow

1. Read current-evidence-contract.md, then collect all three independent read-only surfaces under the same account, collector identity, primary role, secondary-role configuration, and CLI profile:

   AUTH_PROFILE="replace-with-approved-readonly-profile"
   python3 "${CLAUDE_SKILL_DIR}/scripts/collect_snowflake_evidence.py" \
     --surface auth-current --connection "${AUTH_PROFILE}" \
     --output snowflake-auth-current.json
   python3 "${CLAUDE_SKILL_DIR}/scripts/collect_snowflake_evidence.py" \
     --surface auth --connection "${AUTH_PROFILE}" \
     --output snowflake-auth-history.json
   python3 "${CLAUDE_SKILL_DIR}/scripts/collect_snowflake_evidence.py" \
     --surface auth-login-history --connection "${AUTH_PROFILE}" \
     --output snowflake-auth-login-history.json

   Do not use --input-json: offline normalization cannot bind live posture or execution context. A cap hit, collector error, stale receipt, context mismatch, privilege-filtered SHOW row, or user-hash drift blocks scoped completeness.

2. Build one schema-2 bundle containing those receipts, the exact expected hashed organization-plus-account/user/role authorization context, an explicit digest coverage denominator, owner-backed users/workloads, and one approved bounded enforcement window per workload. Operator type and current authentication method declarations must match receipted posture. Include method names and booleans only; omit credential values and all canary/break-glass payloads. Workload names must be unique. MFA posture is a separate factor observation, not a primary auth_methods value. The reference defines the exact envelope.

3. At the controlled local boundary, compute and separately record the final canonical bundle digest:

   python3 "${CLAUDE_SKILL_DIR}/scripts/analyze_auth_evidence.py" \
     --input snowflake-auth-bundle.json --print-input-sha256

   The digest is an operator assertion of byte identity, not a signature or collector identity proof. Never place it inside the bundle it authenticates.

4. Run the evidence-gated analyzer with that out-of-band digest:

   python3 "${CLAUDE_SKILL_DIR}/scripts/analyze_auth_evidence.py" \
     --input snowflake-auth-bundle.json \
     --trusted-input-sha256 sha256:<recorded-digest> \
     --out snowflake-auth-pilot.json

   The wrapper validates exact reviewed SQL hashes, sources, dataset fields, row counts/caps, live mode, wall-clock freshness, declared authorization context, coverage, and current/history reconciliation before allowing receipt rows into analysis. analyze_auth.py remains the metadata-only planning engine; it cannot certify evidence.

5. Load mcp-oauth-role-scoping.md when an MCP/OAuth integration appears. Verify feature support and live role mapping; the report is not evidence that an integration is enabled.

6. Produce the dry-run cutover packet. For each workload include owner, current path, selected target, capability evidence, role scope, canary, rollback, and the exact authorized operator/change window. Read cutover-and-recovery.md.

7. Require both positive and negative receipts: target login and allowed action; old-path rejection only after replacement/recovery; out-of-scope role/object denial; and independent recovery. Keep the current path until receipts are accepted.

Mapping rules

• PERSON with SSO/OAuth evidence: retain interactive design and verify the IdP path; do not silently convert a human to a service identity.
• PERSON with password only: high-priority review, not an automatic disable.
• SERVICE/LEGACY_SERVICE with password/basic: high-priority modernization; choose WIF → key pair → OAuth → PAT only from declared supported options.
• SERVICE without workload: ownership/inventory finding.
• Unknown user, runtime, driver, or target capability: MANUAL_REVIEW, not a guessed migration.
• Missing or untested break-glass identity or canary: block the pilot; do not disable the current path.
• PAT: bounded fallback only; record owner, audience, revocation/expiration process, and why stronger options are unavailable.

Output

Return a JSON report plus a human-readable packet containing:

• deterministic input SHA-256 and evidence scope;
• per-surface trust, freshness, exact-template, cap, and context assessments;
• current/historical pseudonymous user reconciliation and drift;
• latency-settled LOGIN_HISTORY observations, explicitly separated from proof;
• counts and findings for PERSON/SERVICE/LEGACY_SERVICE/SERVICE_AGENT;
• workload-to-identity-to-auth target mapping and rationale;
• managed MCP/OAuth integration state, advertised scopes, client/default-role behavior, scope-setting location/object, allowed/blocked roles, secondary-role controls, and mismatches;
• no-credential safety statement plus narrow analyzer/collector operation boundaries;
• read-only inventory receipt, explicit edit_authority: false, and separately tested break-glass/canary evidence;
• positive/negative verification receipts and a recovery plan; and
• residual unknowns with named owners rather than fabricated certainty.

Error Handling

Examples

Password-backed ETL service

Declare a password-backed ETL_SVC as LEGACY_SERVICE, bind it to etl-prod, and list only supported target methods such as ["WIF", "KEY_PAIR"]. The analyzer selects WIF first, then requires canary login, allowed-action, denied-old-path, and recovery receipts.

Managed MCP/OAuth

Declare OAUTH_SCOPES_SUPPORTED, whether the client requests a named role or session:role:all, the user's DEFAULT_ROLE and DEFAULT_WAREHOUSE, the integration allow/block lists, and OAUTH_USE_SECONDARY_ROLES. A missing or overbroad control stops the packet; the analyzer never broadens it.

Resources

• Identity types and inventory
• Current and historical evidence contract
• Workload authentication options
• Managed MCP/OAuth role scoping
• Cutover and recovery